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TENANT FIT-OUT FOR ITHACA BEER COMPANY - SAI
411-415 College Avenue, Ithaca, NY 14850
HOLT Project No. 20210402 / M/E Reference 210021
Revised per Addendum No. 1
SHEET METAL AND DUCTWORK ACCESSORIES CONSTRUCTION 233100 - 1
SECTION 233100 - SHEET METAL AND DUCTWORK ACCESSORIES CONSTRUCTION
PART 1 - GENERAL
1.1 WORK INCLUDED
A. Provide labor, materials, equipment and services required for the complete installation
designed in Contract Documents.
1.2 QUALITY ASSURANCE
A. Ductwork shall be fabricated and installed in compliance with latest edition of the
following standards.
1. SMACNA Duct Construction Standards - Metal and Flexible Ductwork.
2. SMACNA Duct Liner Application Standard.
3. SMACNA HVAC Air Duct Leakage Test Manual.
4. 2020 Energy Conservation Construction Code of New York State.
5. SMACNA Kitchen Ventilation and Food Service Equipment Fabrication and
Installation Guidelines.
6. NFPA Standard 96.
7. Plans and Specifications which exceed the requirements in any of the referenced
standards.
8. 2020 Mechanical Code of New York State.
B. All sheet metal shall be fabricated and installed by an experienced Contractor
specializing in this type of work.
C. All ductwork and fittings shall have a computer generated label affixed to the exterior
surface of each section, detailing all applicable information including the duct
dimensions, gauge, reinforcement type/class and connection type by systems
manufacturer. Galvanizing thickness shall be clearly stenciled on each duct section.
D. All ductwork on the project shall meet the SMACNA Duct Cleanliness For New
Construction Guidelines, "Advanced Level" of duct cleanliness for production, delivery,
storage and installation of ductwork.
1.3 SUBMITTALS
A. Ductwork Shop Drawings.
B. Duct Access Doors.
TENANT FIT-OUT FOR ITHACA BEER COMPANY - SAI
411-415 College Avenue, Ithaca, NY 14850
HOLT Project No. 20210402 / M/E Reference 210021
Revised per Addendum No. 1
SHEET METAL AND DUCTWORK ACCESSORIES CONSTRUCTION 233100 - 2
C. Flexible Duct.
D. Submit a complete shop standard manual including miscellaneous materials, and
construction details for all shop fabricated materials including, but not limited to, volume
dampers, turning vanes, duct sealant, equipment flexible connections, access doors,
flexible duct, acoustical duct lining, etc.
1.4 GENERAL
A. All adhesives, sealants, primers and paint used for ductwork in the interior of the building
shall comply with the maximum Volatile Organic Compound (VOC) limits called for in
the current version of U.S. Green Building Council LEED Credits EQ 4.1 and EQ 4.2.
1.5 DUCTWORK CLASSIFICATION
A. Duct systems are to be classified and constructed per the SMACNA Velocity-Pressure
classification system as follows:
1. All ductwork shall be constructed for a minimum pressure class of 2 in. w.g.
(unless stated otherwise) for the following systems, as applicable:
a. Supply duct downstream of terminal units.
b. Typical low pressure supply ductwork.
c. Typical return ductwork.
d. Typical low pressure exhaust ductwork.
2. Supply duct upstream of terminal units shall be constructed for a minimum
pressure class of 3 in. w.g. unless otherwise stated or required as per below.
3. Pressure classes above 3 in. w.g. shall be provided as follows, based upon the
external static pressure as scheduled for each specific fan.
Scheduled External Static Pressure Pressure Class
Over 3 in. up to 4 in. w.g. 4 in. w.g.
Over 4 in. up to 6 in. w.g. 6 in. w.g.
Over 6 in. up to 10 in. w.g. 10 in. w.g.
1.6 DUCTWORK SHOP DRAWINGS
A. Prepare minimum 1/4 in. scale drawings:
1. Detailed ductwork shop drawings shall include size, layouts and pressure
classifications. Any ductwork installed without benefit of review by the
Engineer of Record may be subject to replacement at the expense of the
Contractor.
TENANT FIT-OUT FOR ITHACA BEER COMPANY - SAI
411-415 College Avenue, Ithaca, NY 14850
HOLT Project No. 20210402 / M/E Reference 210021
Revised per Addendum No. 1
SHEET METAL AND DUCTWORK ACCESSORIES CONSTRUCTION 233100 - 3
2. Constructed from actual field inspections and measurements so as to assure a
complete job.
3. Incorporate dimensions of actual equipment proposed for use on the project.
4. Showing adequate sections, elevations, and plan views and indicating the bottom
of ductwork elevations from the finished floor.
5. Indicating all volume dampers, fire dampers, smoke dampers, damper access
doors and other accessories required for a completed project.
B. Call to the attention of the Engineers immediately, any major deviations from the
Contract Drawings, which must be made. All deviations shall be documented in writing.
C. Indicate roof, wall and floor opening dimensions and locations shown on shop drawings.
D. Submit prints to each Contractor of the other trades for review for interference's and
coordination with their work.
PART 2 - PRODUCTS
2.1 DUCTWORK MATERIALS
A. Unless otherwise called for, provide materials in accordance with Exhibit I at the end of
this section.
2.2 SQUARE AND RECTANGULAR DUCTWORK
A. Galvanized Sheetmetal: Comply with ASTM A653 and A924, with G90/Z275 coating.
Stainless-steel Sheets: Comply with ASTM A 480/A 480M, Type 304 or 316, as
indicated in Exhibit "I"; cold rolled, annealed, sheet. Exposed surface finish shall be No.
2B, No. 2D or No. 3 as indicated in Exhibit "I". Aluminum sheets: Comply with ASTM
B 209 (ASTM B 209M) Alloy 3003, H14 temper; with mill finish for concealed ducts,
and standard, one-side bright finish for duct surfaces exposed to view. Gauges per
SMACNA HVAC Duct Construction Standards, Metal and Flexible.
B. Transverse and longitudinal duct seams reinforcement shall conform to appropriate tables
and figures per SMACNA Velocity-Pressure Classification for duct construction.
1. Transverse joints shall be sealed with duct joint sealant. "Ductmate" or "Nexus"
4-bolt connection systems may be used in lieu of standard construction.
2. Field assembled longitudinal seams shall be sealed with duct sealant. Factory or
shop fabricated rolled or machine pressed longitudinal seams does not require
sealant.
C. Corner closures shall be required as described and illustrated by SMACNA Duct
Construction Standards.
TENANT FIT-OUT FOR ITHACA BEER COMPANY - SAI
411-415 College Avenue, Ithaca, NY 14850
HOLT Project No. 20210402 / M/E Reference 210021
Revised per Addendum No. 1
SHEET METAL AND DUCTWORK ACCESSORIES CONSTRUCTION 233100 - 4
D. Throat radius on all elbows shall not be less than the dimension of the duct plane of
radius. Where this cannot be maintained, use shorter radius with internal guide vanes, or
square elbow with turning vanes.
E. Bracing and hanging of ductwork shall be per SMACNA Standards for size and system
class of ductwork being used.
F. Any transformations shall not reduce the ductwork cross-sectional area. Maximum angle
in straight duct, 20 for diverging flow and 30 for contraction flow. Transformation
from square to round or flat to oval seams welded or brazed.
2.3 ROUND DUCTWORK
A. Standard Round Ductwork:
1. Galvanized Sheet metal: Comply with ASTM A653 and A924, with G90/Z275
coating. Stainless-steel Sheets: Comply with ASTM A 480/A 480M, Type 304
or 316, as indicated in Exhibit "I"; cold rolled, annealed, sheet. Exposed surface
finish shall be No. 2B, No. 2D or No. 3 as indicated in Exhibit "I". Aluminum
sheets: Comply with ASTM B 209 (ASTM B 209M) Alloy 3003, H14 temper;
with mill finish for concealed ducts, and standard, one-side bright finish for duct
surfaces exposed to view. Gauges per SMACNA Duct Construction Standards.
Spiral lock-seam or longitudinal fusion-welded.
2. All spiral ducts shall have locked seams so made as to eliminate leakage under
pressure for which this system has been designed. Longitudinal seams duct shall
have fusion-welded butt seams.
3. Round Ductwork Fittings:
a. All fittings fabricated per SMACNA Standards for round and flat-oval
ductwork, material to match straight pieces of ductwork.
b. Fittings shall have continuous, welded seams.
c. 90 tees shall be conical type. 90 tees and 45 laterals up to and
including 12 in. diameter tap size shall have a radiused entrance into the
tap, produced by machine or press forming. The entrance shall be free of
any restrictions.
d. Round taps off the bottom of rectangular ducts down to diffusers shall be
made with a 45 square to round shoe-tap.
4. Elbows:
a. Diameters 3 in. through 8 in.: Two-section stamped and continuously
welded elbows, material to match straight pieces of ductwork.
TENANT FIT-OUT FOR ITHACA BEER COMPANY - SAI
411-415 College Avenue, Ithaca, NY 14850
HOLT Project No. 20210402 / M/E Reference 210021
Revised per Addendum No. 1
SHEET METAL AND DUCTWORK ACCESSORIES CONSTRUCTION 233100 - 5
b. Over 8 in.: Gored construction with standing seam construction and
internally sealed or continuously welded. Less than 35 - two gores, 36
to 71 - three gores, over 71 - five gores.
c. Fabricated to a centerline radius of 1.5 times the cross-section diameter.
5. Joints:
a. For duct construction pressure 3 in. w.g. or greater:
1) Round Joints:
a) Unexposed Duct 3 in. - 30 in. Diameter: Connect round
duct with a one piece interior slip coupling, at least two
gauges heavier than duct wall, beaded at center and
fastener to duct with screws. Seal joint with an
approved sealant applied continuously around both end
of coupler prior to assembling and after fastening.
b) All Exposed Duct and Unexposed Duct 30 in. - 72 in.
Diameter: Install using a three piece, gasket flanged-
joint consisting of two internal flanges, with integral
mastic sealant, and one external closure band, which
compress the gasket between the internal flanges.
(1) Acceptable Manufacturer: Ductmate Industries
"Spiralmate" system or approved equal.
c) Above 72 in. Diameter: Install using companion angle
flanged joints as defined in Figure 3-1 of the 2005
SMACNA Manual, "HVAC Duct Construction
Standards, Metal and Flexible" Third Edition. Refer to
manual for proper sizing and construction details.
d) Dust collection systems and exposed duct 3 in. - 14 in.
use a one piece, polyethylene lined gasket connector
with integrated bolt for the closure system.
(1) Acceptable Manufacturer: Ductmate Industries
"Quicksleeve" or approved equal.
b. Pipe-to-pipe joints in diameters up to 60 in. shall be by the use of sleeve
couplings, reinforced by rolled beads.
c. Pipe-to-fitting joints in diameters up to 60 in. shall be by slip-fit of
projecting collar of the fitting into the pipe.
d. Insertion length of sleeve coupling and fitting collar shall be 2 in. up to
36 in. diameter and 4 in. above 36 in. diameter.
TENANT FIT-OUT FOR ITHACA BEER COMPANY - SAI
411-415 College Avenue, Ithaca, NY 14850
HOLT Project No. 20210402 / M/E Reference 210021
Revised per Addendum No. 1
SHEET METAL AND DUCTWORK ACCESSORIES CONSTRUCTION 233100 - 6
e. Pipe-to-pipe and pipe-to-fitting connections in ductwork above 60 in. in
diameter shall be made by angle ring flanges. The flange on the pipe
shall be a 2 in. x 2 in. x 3/16 in. angle attached to the pipe with a
continuous weld. The fittings shall have a loose ring "Van Stone" flange.
A 5/8 in. flange shall be provided to act as a gasketing surface for sealing
with the angle ring being a rolled, welded ring 2 in. x 2 in. x 3/16 in.
Bolt hole spacing for angle rings shall be 6 in. centers.
f. If longitudinal seam duct greater than 60 in. in diameter is supplied in
lengths greater than 4 ft., one angle ring must be welded to the duct on 4
ft. centers for support.
2.4 DUCTWORK SEALING
A. SMACNA Duct Sealing Classification shall be used for duct systems using the following
criteria:
1. Ductwork and all plenums with pressure class ratings shall be constructed to Seal
Class A, as required to meet the requirements of SMACNA Duct Construction
Standards and with standard industry practice, including transverse joints,
longitudinal seams, fitting connections, and all penetrations of the duct wall.
2. Openings for rotating shafts shall be sealed with bushings or other devices that
seal off air leakage. Pressure sensitive tape shall not be used.
3. All connections shall be sealed, including but not limited to spin-ins, taps, other
branch connections, access doors, access panels and duct connections to
equipment.
4. Sealing that would void product listings is not required.
5. Spiral lock seams need not be sealed.
B. Duct sealant for indoor applications shall be non-fibrated, water based, Hardcast Iron-
Grip IG-601, Ductmate PRO Seal, Foster 32-17 or Childers CP146.
C. Duct sealant for outdoor applications shall be fibrated, water based, Hardcast Versa-Grip
VG-102, Ductmate Fiberseal, Foster 32-17 or Childers CP148.
D. Sealants and tapes shall be listed and labeled in accordance with UL 181A or UL181B
and marked according to type.
2.5 TURNING VANES
A. Provide in mitered elbows as shown on contract drawings. Vanes 36 in. or longer shall
be double wall air foil type. All turning vanes shall be installed as per the latest
SMACNA Standards. Turning vane size and spacing shall be as per SMACNA. Turning
vane spacing greater than SMACNA Standards is not acceptable.
TENANT FIT-OUT FOR ITHACA BEER COMPANY - SAI
411-415 College Avenue, Ithaca, NY 14850
HOLT Project No. 20210402 / M/E Reference 210021
Revised per Addendum No. 1
SHEET METAL AND DUCTWORK ACCESSORIES CONSTRUCTION 233100 - 7
B. Turning vanes shall be Harper or equivalent double wall turning vanes fabricated from
the same material as the duct.
C. Turning vane front and back panels shall be securely locked together with adequate
crimping to prevent twisting of vane. Vane shall be capable of withstanding 250 pounds
of tensile load when secured according to the manufacturer's instructions.
D. Rails for mounting turning vanes shall have self locking, friction fit tabs designed to
facilitate proper alignment of vanes. Tab spacing shall be as specified in Figure 4-3 of
the 2005 SMACNA Manual, "HVAC Duct Construction Standards, Metal and Flexible".
Rail systems with non-compliant tab spacing shall not be accepted.
E. Acoustical Turning Vane: Shall be used in applications that require quiet operating
systems. Mounting rails shall have friction insert tabs that align the vanes automatically.
F. Acceptable Manufacturer: Ductmate Industries PRO-Rail Turning Vane or approved
equal.
2.6 DAMPERS IN DUCTWORK
A. Blade Type Volume Dampers: Constructed per SMACNA, one gauge heavier than duct
material, securely fastened to 3/8 in. sq., cold rolled steel operator rod. Provide Ventlock
639 elevated dial regulator for 2 in. insulated ductwork.
B. Multiple Blade Type Volume Dampers: Provide multiple blade volume dampers in
ductwork above 12 in. in height.
1. Heavy duty, manual balancing dampers suitable for application in HVAC
systems with velocities to 1,500 ft. per minute, open position and max. pressure
of 3 in. w.g. close position. Ruskin MD 35 or equivalent.
2. Fabrication:
a. Frame: 5 in. x minimum 16 gauge roll formed, galvanized steel hat-
shaped channel, reinforced at corners. Structurally equivalent to 13
gauge U-channel.
3. Blades:
a. Style: Single skin with 3 longitudinal grooves.
b. Action: Opposed.
c. Orientation: Horizontal.
d. Material: Minimum 16 gauge equivalent thickness, galvanized steel.
e. Width: Nominal 6 in.
TENANT FIT-OUT FOR ITHACA BEER COMPANY - SAI
411-415 College Avenue, Ithaca, NY 14850
HOLT Project No. 20210402 / M/E Reference 210021
Revised per Addendum No. 1
SHEET METAL AND DUCTWORK ACCESSORIES CONSTRUCTION 233100 - 8
4. Bearings: Molded synthetic sleeve, turning in extruded hole in frame.
5. Linkage: Concealed in frame.
6. Axles: Minimum 1/2 in. diameter, plated steel, hex-shaped, mechanically
attached to blade.
7. Control Shaft: 3/8 in. square plated steel.
8. Finish: Mill galvanized.
a. Actuator: Hand quadrant for 3/8 in. square extended shaft.
b. Hand Quadrant Standoff Bracket: 2 in. standoff for insulated ductwork.
c. Oillite bearings.
d. Factory Sleeve: Minimum 20 gauge thickness, minimum 12 in. length.
C. Fire and Smoke Dampers: See "Fire and Smoke Dampers" Section.
D. Automatic Air Dampers: Furnished as part of "Building Management System" Section
230923, and installed by this Contractor.
E. Remote Balancing Dampers: For round ducts 4 inches to 24 inches in diameter,
Greenheck RBDR-50, or equivalent.
1. Ratings: 1 in. wg. pressure differential, 2000 fpm, 180 deg. F.
2. Construction: Reinforced 20 ga. galvanized steel frame, 20 ga. galvanized steel
blade, 3/8 in. sq. plated steel axle, synthetic (acetal) sleeve type bearings, 9 volt
actuator.
3. Options: (Edit as required):
a. "EZ Balance" remote control device with 9 volt battery and 5 ft. RJ11
cable.
b. Diffuser body connectors.
c. Single gang wall plates with RJ11 ports (1, 2, 3, 4, or 6 port). Colors:
white, ivory or stainless steel.
d. Round wall/ceiling mounting plate with one port.
e. 14, 25 or 50 ft. plenum rated RJ11 cable, as required.
f. RJ11 cable connectors.
TENANT FIT-OUT FOR ITHACA BEER COMPANY - SAI
411-415 College Avenue, Ithaca, NY 14850
HOLT Project No. 20210402 / M/E Reference 210021
Revised per Addendum No. 1
SHEET METAL AND DUCTWORK ACCESSORIES CONSTRUCTION 233100 - 9
2.7 FLEXIBLE AIR DUCTS AND CONNECTORS
A. Flexible air ducts and connectors shall be constructed in compliance with NFPA Bulletin
90A, 90B and UL Standard 181 and shall be listed and labeled as Class I Air Duct.
B. Flexible air ducts and connectors shall be tri-laminate:
1. Consisting of corrosion resistant galvanized steel helix encapsulated by a double
lamination of polyethylene or spun bond nylon.
2. Factory applied (R 6.0 or R 8.0) fiberglass exterior insulation, sheathed in a
seamless, tri-directionally reinforced, metalized polyester, exterior vapor barrier.
3. R-value shall be classified by Underwriters Laboratories, and certified by the Air
Diffusion Council, in accordance with ADC Flexible Duct Performance and
Installation Standard (1991), using ASTM C-518, at installed wall thickness, on
flat insulation only. Comply with ASHRAE/IESNA 90.1.
4. Recommended operating pressure for flexible ductwork shall be three times
maximum system press but not less than 6 in. w.g. positive pressure for 4 in. - 20
in. dia., 5 in. wg. negative pressure through 16 in. dia., 1 in. negative pressure for
18 in. and 20 in. dia. Maximum velocity of 5500 fpm.
5. Operating temperature range - 20°F to 250°F, intermittent @1/2 in. pos. w.g.
max., -20°F to 140°F, continuous at maximum pressure.
6. Flame Spread: 25 max. smoke developed rating: 50 max.
7. Porous inner core flexible duct shall not be used.
C. Static pressure and thermal performance shall be tested and certified in accordance with
Air Diffusion Council (ADC) Test Code FD-72-R1 under conditions of 140°F for 164
hours and 180°F for 4 hours.
D. Acoustical performance shall be certified in accordance with ASTM E 477 and/or Air
Diffusion Council Test Code FD-72-R1.
1. Minimum Acoustic Performance:
a. The insertion loss (dB) of a 6 foot length of duct when tested in
accordance with ASTM E477 at a velocity of 1000 feet per minute shall
be at least:
125 Hz 250 Hz 500 Hz 1000 Hz 2000 Hz 4000 Hz
8 inch dia. 26 27 27 31 32 27
12 inch dia 22 26 24 31 31 20
TENANT FIT-OUT FOR ITHACA BEER COMPANY - SAI
411-415 College Avenue, Ithaca, NY 14850
HOLT Project No. 20210402 / M/E Reference 210021
Revised per Addendum No. 1
SHEET METAL AND DUCTWORK ACCESSORIES CONSTRUCTION 233100 - 10
E. Friction loss and leakage for flexible duct only shall be certified in accordance with Air
Diffusion Council Test Code FD-72-R1. Leakage for connections shall be accordance
with UL 181 requirements.
F. Basis-of-Design: Flexmaster 6B (R-6.0).
G. Acceptable Manufacturers:
1. Dundas-Jafine Type SPC R6.0/ Type SPC R8.0.
2. Hart & Cooley Type F216 (R-6.0)/ Type F218 (R-8.0)
3. Flexible Technologies, Inc. Thermaflex Type M-KE (R-6.0)/ Type M-KE (R-
8.0)
4. Atco Rubber Products, Inc. Type 036 (R-6.0)/Type 031 (R-8.0).
5. Superior Air Ducts Type SF 082 (R-8.0)
2.8 FLEXIBLE CONNECTIONS TO FANS AND EQUIPMENT
A. Basis of Deign: Ventfabrics, Inc.
B. Acceptable Manufacturers: Ductmate Industries, Inc., Duro Dyne Inc., Elgen
Manufacturing, Ward Industries, Inc.; a division of Hart & Cooley, Inc.
C. Materials: Flame-retardant or noncombustible fabrics, water and mildew resistant UL
Standard 214.
D. Coatings and Adhesives: Comply with UL 181, Class 1.
E. Metal-Edged Connectors: Factory fabricated with a fabric strip wide attached to two (2)
strips of 2-3/4-in. wide, 0.028-in. thick, galvanized sheet steel or 0.032 in. thick
aluminum sheets. Provide metal compatible with connected ducts.
F. Indoor System, Flexible Connector Fabric: Glass fabric double coated with neoprene.
1. Minimum Weight: 26 oz./sq. yd.
2. Tensile Strength: 480 lbf/in. in the warp and 360 lbf/in. in the filling.
3. Service Temperature: Minus 40 to plus 200°F.
G. Outdoor System, Flexible Connector Fabric: Glass fabric double coated with
weatherproof, synthetic rubber resistant to UV rays and ozone.
1. Minimum Weight: 24 oz./sq. yd.
2. Tensile Strength: 530 lbf/in. in the warp and 440 lbf/in. in the filling.
TENANT FIT-OUT FOR ITHACA BEER COMPANY - SAI
411-415 College Avenue, Ithaca, NY 14850
HOLT Project No. 20210402 / M/E Reference 210021
Revised per Addendum No. 1
SHEET METAL AND DUCTWORK ACCESSORIES CONSTRUCTION 233100 - 11
3. Service Temperature: Minus 50 to plus 250°F.
H. Thrust Limits: Combination coil spring and elastomeric insert with spring and insert in
compression, and with a load stop. Include rod and angle-iron brackets for attaching to
fan discharge and duct.
1. Frame: Steel, fabricated for connection to threaded rods and to allow for a
maximum of 30 degrees of angular rod misalignment without binding or
reducing isolation efficiency.
2. Outdoor Spring Diameter: Not less than 80 percent of the compressed height of
the spring at rated load.
3. Minimum Additional Travel: 50 percent of the required deflection at rated load.
4. Lateral Stiffness: More than 80 percent of rated vertical stiffness.
5. Overload Capacity: Support 200 percent of rated load, fully compressed, without
deformation or failure.
6. Elastomeric Element: Molded, oil-resistant rubber or neoprene.
7. Coil Spring: Factory set and field adjustable for a maximum of 1/4-in.
movement at start and stop.
2.9 ACCESS DOORS
A. General:
1. Provide access doors of adequate size to allow easy access to the equipment that
will require maintenance. Provide insulated or acoustically lined doors to
prevent condensation where applicable.
2. Manufacturer to provide an installed neoprene gasket around perimeter of access
door for airtight seal.
3. Systems 3 in. w.g. or less shall utilize a hinged, cam, or hinged and cam square
framed access door.
4. Systems 4 in. w.g. and above shall utilize a sandwich type access door.
Construct doors in accordance with Figure 7-3 of the 2005 SMACNA Manual,
"HVAC Duct Construction Standards, Metal & Flexible" Third Edition.
5. Approved Manufacturer: Ductmate Industries "Sandwich" style door or
approved equal.
6. All access doors shall be continuous piano hinged type, unless noted otherwise.
TENANT FIT-OUT FOR ITHACA BEER COMPANY - SAI
411-415 College Avenue, Ithaca, NY 14850
HOLT Project No. 20210402 / M/E Reference 210021
Revised per Addendum No. 1
SHEET METAL AND DUCTWORK ACCESSORIES CONSTRUCTION 233100 - 12
7. Non-hinged only allowed where clearance to ceiling does not allow a full 90
swing.
8. Double panel insulated type when used in insulated duct.
9. Single panel uninsulated type allowed in un-insulated duct.
10. Pressure rated according to system in which being installed. Door-to-frame and
frame-to-duct gasketing.
11. Provide specified Seal Class A or B ductwork sealing around frame, and hand
adjust the latch tension for proper seal, on all access doors other than sandwich
panel (Ductmate) style.
12. MINIMUM access door size for ducts 12 in. or less in depth is 12 in. x 8 in.
13. MINIMUM access door size for ducts 12 in. to 18 in. in depth is 18 in. x 14 in.
14. MINIMUM access door size for ducts more than 18 in. in depth is 24 in. x 18 in.
15. In ducts which require multiple section fire dampers due to duct size, provide one
access door for each fire damper section.
16. Access doors for fire and smoke dampers shall be permanently labeled with 1/2
in. high lettering reading "SMOKE DAMPER" or "FIRE DAMPER".
17. Grease exhaust duct doors shall be grease and air tight, UL 1978 listed, meet
NFPA 96 standards and all mechanical codes. Grease duct access doors can be
sandwich type or with a weld on frame, with/without hinge. Approved
Manufacturer: Ductmate Industries "Ultimate" style door or approved equal.
18. All grease duct access doors used must be accompanied by independent testing in
conjunction with each manufacturer's respective wrap system for high
temperature applications.
B. Door Types:
1. Low Pressure Systems (2 in. w.g. pressure class): National Controlled Air ADH-
1, Ruskin ADH22, Vent Products 9701, Air Balance FSA-100, Safe Air SAH,
Nailor.
2. Medium and High Pressure Systems (3 in. w.g. pressure class and higher):
a. Rectangular Duct: Ductmate Industries "Ultimate" Style Door, or equal.
b. Round Duct: Ductmate Industries Round Sandwich type, or equal. 8 in.
x 4 in. for ducts 14 in. and less in diameter. Ductmate Industries Round
Sandwich type 16 in. x 12 in. for ducts more than 14 in. in diameter.
TENANT FIT-OUT FOR ITHACA BEER COMPANY - SAI
411-415 College Avenue, Ithaca, NY 14850
HOLT Project No. 20210402 / M/E Reference 210021
Revised per Addendum No. 1
SHEET METAL AND DUCTWORK ACCESSORIES CONSTRUCTION 233100 - 13
c. Furnish and install factory supplied protector molding on cut medal edge
for all Ductmate access doors.
3. Kitchen Hood Exhaust Systems: In accordance with the latest requirements of
NFPA 96, grease-tight, flanged and bolted. Approved Manufacturer: Ductmate
Industries "Ultimate" style door or approved equal.
2.10 EXHAUST HOODS AND HOOD CONNECTIONS
A. General Requirements:
1. Provide hoods and/or duct connections to hoods/fans where furnished by others.
2. Duct material, thickness and joints as required for gases and vapors involved and
per SMACNA.
3. Clearance between bottom of hood and floor shall be 80 in.
4. Provide continuous internal channel brackets for supporting lighting fixtures,
coordinate with and install to suit Division 26 "Electrical".
B. Kitchen Hood Duct Connections:
1. Exposed duct shall be 304 stainless steel, #3 polish finish, welded construction.
2. Concealed duct shall be black steel, welded, flanged and gasketed.
3. Metal gauges comparable to similar duct sizes with adequate stiffening, 16 gauge
minimum thickness.
4. Support from building structural members.
2.11 ACOUSTIC-THERMAL DUCT LINING IN DUCTWORK
A. General: Comply with NFPA Standard 90 and NAIMA Standard AHC-101.
B. Materials: ASTM C 1071, Type I. Glass mineral wool insulation coated with an anti-
microbial EPA registered coating that seals the airstream surface fibers into a smooth,
low-friction surface acoustic ductliner shall be of thickness shown in the table. Density
at 1.5 PCF. Maximum "K" value to be 0.24 btu/in. /sq. ft. /degrees F. /hr. when tested in
accordance to ASTM C177. Acoustic duct liner to be suitable for use up to 6000 feet per
minute air velocity and temperatures up to 250°F. The acoustic duct liner shall not
accelerate the corrosion of steel, copper or aluminum. The liner shall not absorb greater
than 3% by weight when tested per ASTM C1104. Acoustic duct liner shall provide the
minimum sound absorption coefficients shown below when tested per ASTM C423 and
ASTM E795, Mounting Type A.
OCTAVE BAND FREQUENCIES HZ
Thickness 125 250 500 1000 2000 4000 NRC
TENANT FIT-OUT FOR ITHACA BEER COMPANY - SAI
411-415 College Avenue, Ithaca, NY 14850
HOLT Project No. 20210402 / M/E Reference 210021
Revised per Addendum No. 1
SHEET METAL AND DUCTWORK ACCESSORIES CONSTRUCTION 233100 - 14
1-1/2 in. .23 .50 .87 .92 .93 .93 .80
2 in. .37 .76 1.02 1.00 .98 .92 .95
C. Thickness: Unless otherwise noted, all supply air ductwork indicated to be acoustically
lined, shall have 1-1/2 in. thick liner with a minimum R value of 6. Return or exhaust
ductwork, if acoustically lined, shall be of a thickness specifically noted. Note that per
the symbol list (L) equals 1-1/2 in. thick. If called for on the plans, (2L) equals 2 in.
thick.
D. Fire Hazard Classification: Flame spread rating of not more than 25 and a smoke
developed rating of no higher than 50, when tested in accordance with ASTM E84, UL
723, UL/ULC S102-M88 and NFPA 255.
E. Liner Adhesive: Comply with NFPA Standard 90A, ASTM C919, and maximum VOC
requirements of LEED EQ 4.1 and EQ 4.2.
F. Mechanical Fasteners: Galvanized steel, suitable for adhesive attachment, mechanical
attachment, or welding attachment to duct. Provide fasteners that do not damage the liner
when applied as recommended by the manufacturer, that do not cause leakage in the duct,
and will indefinitely sustain a 50 pound tensile dead load test perpendicular to the duct
wall.
1. Fastener Pin Length: As required for thickness of insulation, and without
projecting more than 1/8 inch into the airstream.
2. Adhesive for Attachment of Mechanical Fasteners: Comply with the "Fire
Hazard Classification" of duct liner system.
G. Design Equipment: Knauf Atmosphere.
H. Acceptable Makes: Knauf Atmosphere, Certainteed ToughGard R.
OCTAVE BAND FREQUENCIES HZ
Thickness 125 250 500 1000 2000 4000 NRC
1-1/2 in. .10 .47 .85 1.01 1.02 .99 .85
2 in. .25 .66 1.00 1.05 1.02 1.01 .95
I. For duct velocities above 4000 fpm, provide metal "build-outs" of proper height, welded
to the ductwork for turning vanes and dampers.
2.12 CABLE SUSPENSION SYSTEM
A. Ductwork not required to be exterior insulated in exposed installations may be installed
using a cable suspension system.
B. Ductwork shall be installed using load rated, stainless steel cable suspension systems.
Cables shall be pre-cut lengths, type 316 stainless steel with fused ends, and pre-made
end attachments.
TENANT FIT-OUT FOR ITHACA BEER COMPANY - SAI
411-415 College Avenue, Ithaca, NY 14850
HOLT Project No. 20210402 / M/E Reference 210021
Revised per Addendum No. 1
SHEET METAL AND DUCTWORK ACCESSORIES CONSTRUCTION 233100 - 15
C. Cable grips shall be of 316 stainless steel and have an internal tamperproof cable release
mechanism.
D. Stress distribution saddles shall be prescribed in addition for the support of rectangular
duct on corners as necessary.
E. Hangers shall have a manufacturer's published safe working load and have a 5 to 1 safety
factor.
F. Hang and support ductwork as defined in the latest edition of SMACNA Manual,
"HVAC Duct Construction Standards, Metal & Flexible".
G. Adjustable steel cable hanging system consisting of spring loaded, serrated clamping
mechanism shall be tested and certified in compliance with all applicable SMACNA
standards for upper and lower attachment methods.
1. All approved systems must be installed using matching components including
steel cable, clamping mechanism and hardware approved by the manufacturer for
its corresponding load rating. No Substitution of manufacturer's components is
permitted.
2. Approved systems must be installed per the manufacturer's specific instructions
and must not exceed the stated working load rating at any point throughout the
system.
H. Supports, bar/angle reinforcements, and other products that are not part of the duct that
are manufactured of uncoated mild steel shall either be painted with two (2) coats of
primer or shall be manufactured of a galvanized equivalent material.
I. Approved Manufacturer: Ductmate Industries "Clutcher" Cable Hanging System or
Gripple Inc.
2.13 DUCT ACCESSORY HARDWARE
A. Instrument Test Holes: Cast iron or cast aluminum to suit duct material, including screw
cap and gasket. Size to allow insertion of pitot tube and other testing instruments and of
length to suit duct-insulation thickness.
B. Ventlock 699 or 699-2 based upon insulation thickness.
C. Install duct test holes where required for duct traverse testing and balancing purposes.
PART 3 - EXECUTION
3.1 REQUIREMENTS
A. Equipment and systems shall be installed in accordance with local and state codes and
regulations having jurisdiction. Bracing and hanging of ductwork shall be per SMACNA
- HVAC Duct Construction Standard.
TENANT FIT-OUT FOR ITHACA BEER COMPANY - SAI
411-415 College Avenue, Ithaca, NY 14850
HOLT Project No. 20210402 / M/E Reference 210021
Revised per Addendum No. 1
SHEET METAL AND DUCTWORK ACCESSORIES CONSTRUCTION 233100 - 16
B. Install all ductwork concealed and tight to the structure above unless noted otherwise on
shop drawings. Fabricate only after the approval of shop drawings, and in locations to
avoid interferences. Ductwork installed without approved shop drawings, which requires
removal/modification and/or reinstallation due to conflicts or improper installation shall
be repaired at no cost to the Owner.
C. Sizes given on contract drawings are inside dimensions.
D. Keep openings continuously closed and sealed with protective plastic wrapping during
construction to prevent entrance of dirt and debris.
E. Extend access openings, damper rods and levers, to outside of external insulation make
systems airtight.
F. No piping, conduit or other obstruction to airflow is permitted in ductwork.
G. Provide necessary openings, hanger inserts, framing, chases, and recesses, not provided
by other trades.
H. Exposed exhaust or return registers and grilles shall be flush with face of duct; exposed
supply registers and grilles shall be mounted outside airstream with 45 shoe-tap
extension collars.
I. Provide 14 gauge sleeves for ducts passing through Mechanical Room floors. Set sleeves
4 in. above finished floor in Mechanical Rooms, seal watertight to floor.
J. Where a return or exhaust duct is shown to be left open ended, provide hardware mesh
screen at opening.
K. Do not utilize flexible ductwork or connection in any way to connect variable or constant
volume boxes to ductwork.
L. For duct penetrations of non-rated walls, provide sheet metal angle framing or sheet
metal closure panels around the entire perimeter of each duct wall penetration on both
sides of the wall, where the gap exceeds 1/4 inch. Where the gap is less than 1/4 inch, the
gap may be caulked on both sides of the wall. Non-rated wall penetrations SHALL NOT
be fire caulked under any circumstances.
M. For duct penetrations of rated walls, see Specification Section 230500 - Basic Mechanical
and Electrical Requirements.
N. Ductwork that is called for to be welded shall be fully welded, continuous around the
entire perimeter at all joints/seams, and shall be fully airtight and watertight.
3.2 FLEXIBLE CONNECTIONS
A. Provide flexible connections for the intake and discharge connections of duct connected
to fans and air handling equipment.
TENANT FIT-OUT FOR ITHACA BEER COMPANY - SAI
411-415 College Avenue, Ithaca, NY 14850
HOLT Project No. 20210402 / M/E Reference 210021
Revised per Addendum No. 1
SHEET METAL AND DUCTWORK ACCESSORIES CONSTRUCTION 233100 - 17
B. Round connections are to be made with adhesive and metal drawbands with ends tightly
bolted.
C. Rectangular connections shall be made with material securely held in grooved seam
between flanges. Attach with adhesive and mechanical fasteners on 6 in. centers.
D. Connections shall be made with a minimum of 2 in. space between duct and equipment
collars, installed in line, and with 1 in. excess material folded so as not to interfere with
airflow through connection.
E. Mechanically fastened and sealed, with specified duct sealant, at duct and equipment
connections.
3.3 FLEXIBLE AIR DUCTS AND CONNECTORS
A. "Air duct" applies to conduit or passageway for conveying air to or from heating, cooling,
air conditioning or ventilating equipment but not including the plenum as defined in
NFPA 90A. "Air connector" applies to conduit for transferring air between an air duct or
plenum and an air terminal device or an air inlet or an air outlet as defined by the NFPA
90A.
B. For round to oval connections, provide round-oval flexible adapter.
C. Flexible air ducts and connectors shall be provided in fully extended condition, free from
kinks.
D. Flexible air ducts and connectors shall not be used in systems with entering air
temperatures in excess of 250°F.
E. Flexible air ducts and connectors shall use only the minimum length required to make the
connection and shall be installed in the horizontal or vertical position. Flexible elbows
are not acceptable. Do not exceed a maximum length of 48 in., fully extended.
F. Flexible air ducts and connectors shall use minimum 1/2 in. wide positive locking, steel
worm drive clamp, or nylon plenum rated straps for joints and connections. One clamp
or strap for the inside core liner and one clamp or strap for the outer jacketing. When
non-metallic (nylon) straps are used, they should be listed and labeled to standard UL
181B. Fastener package should be marked UL 181 B-C.
G. Collars to which flexible duct is attached shall be beaded and a minimum of 2 in. in
length. Wrap twice with UL 181 tape and secure with clamp or strap. Sleeves used for
joining two sections of flexible duct shall be beaded and a minimum of 4 in. in length.
The draw band shall be positioned behind the bead on the metal collar.
H. Outer vapor barrier and insulation shall be slid over inner core and collar, wrapped twice
with UL 151 tape and secured with a clamp or strap.
TENANT FIT-OUT FOR ITHACA BEER COMPANY - SAI
411-415 College Avenue, Ithaca, NY 14850
HOLT Project No. 20210402 / M/E Reference 210021
Revised per Addendum No. 1
SHEET METAL AND DUCTWORK ACCESSORIES CONSTRUCTION 233100 - 18
I. Connections shall be per SMACNA "HVAC Duct Construction Standards - Metal and
Flexible", Air Diffusion Council "Flexible Duct Performance and Installation Standards"
and NAIMA Installation Standards.
J. Flexible duct shall be supported at manufacturer's recommended intervals, but no greater
distance than 2'-6" on center and prior to all 90 degree bends. Maximum permissible sag
shall be 1/2 in. per foot of support spacing. Provide a minimum of one hanger on each
run of flexible duct.
K. A connection to rigid duct or equipment shall be considered a support joint. Long
horizontal duct runs with sharp bends shall have additional supports before and after the
bend approximately one duct diameter from the centerline of the bend.
L. Hanger or saddle material in contact with the flexible duct shall be of sufficient width to
prevent any restriction of the internal diameter of the duct when the weight of the
supported section rests on the hanger or saddle material. In no case shall the material
contacting the flexible duct be less than 1-1/2 in. wide. Factory installed suspension
systems integral to the flexible duct are an acceptable alternative hanging method when
the manufacturer's recommended procedures are followed.
M. The hanger shall be strapped around the flexible duct and secured to the structure above.
Hangers shall not be attached to other mechanical or electrical objects. Hangers may be
attached to an approved trapeze. Ceiling grid shall not be used to fabricate a trapeze.
Support hangers shall be installed horizontal. Screws shall not be used to penetrate the
flexible duct to attach to the hanger.
N. Provide flexible duct connections and splices in accordance with manufacturer's
recommended installation instructions.
O. Seal flexible duct connections with sealing materials listed and labeled in accordance
with UL 181B. Mechanically secure connections with approved clamping materials.
3.4 TURNING VANES
A. Install only in square elbows of equal dimensions.
B. Install as per latest SMACNA Standards.
C. Secure vane runners to duct with spot welding, riveting or sheet metal screws.
D. When installing in ductwork with internal insulation.
1. Install runners in ductwork inside insulation and bolt through insulation and duct
sides, welding bolts to insure rigid installation. Provide build-outs for duct
Velocity-Pressure classes above 2 in. w.g.
TENANT FIT-OUT FOR ITHACA BEER COMPANY - SAI
411-415 College Avenue, Ithaca, NY 14850
HOLT Project No. 20210402 / M/E Reference 210021
Revised per Addendum No. 1
SHEET METAL AND DUCTWORK ACCESSORIES CONSTRUCTION 233100 - 19
3.5 DUCT CLEANLINESS AND CLEANING AFTER INSTALLATION
A. Duct Cleanliness:
1. All ductwork on the project shall meet the SMACNA Duct Cleanliness For New
Construction Guidelines, "Advanced Level" of duct cleanliness for production,
delivery, storage and installation of ductwork.
2. Prior to shipment to the jobsite, all duct ends and openings must be covered with
a heavy duty, dual-ply, clear polyethylene protective film. Open ends are to be
kept covered during transport, storage, and installation. As ductwork is installed
at the job site, open ends are to be covered to maintain cleanliness.
3. The film must be securely affixed to protect against dirt and debris, and must be
translucent to facilitate inspection of interior surfaces without removing the film.
The film is have a elongation rating of 600% and a break strength of 13.1 lbs./in.
The film shall contain no VOC's, and shall leave no residue on duct after
removal.
4. Manufacturer: Ductmate Industries ProGuard (heavy duty grade clear).
B. Cleaning After Installation:
1. Interior surfaces shall be free of dust and debris prior to initial start up. Protect
equipment which may be harmed by excessive dirt with filters, or bypass during
cleaning. Provide adequate access into ductwork for cleaning purposes. Any
cleaning of duct systems shall comply with recommendations of NAIMA and
NADCA.
2. Clean external surfaces of foreign substances that might cause corrosion,
deterioration of the metal, or where ductwork is to be painted.
3. Clean debris from system before fans are turned on.
4. Keep openings continuously closed during the construction period.
5. Pay damages resulting from dirt blown on painted or other finished surfaces.
6. Repair or replace damaged fan wheels, dampers, or other system parts damaged
as a result of debris.
7. Clean system as many times as required until the entire system is dirt free.
3.6 INSTALLATION OF ROUND DUCTWORK
A. Use factory-fabricated couplings for joints.
B. After the joint is slipped together, sheet metal screws are placed 1/2 in. from the joint
bead for mechanical strength.
TENANT FIT-OUT FOR ITHACA BEER COMPANY - SAI
411-415 College Avenue, Ithaca, NY 14850
HOLT Project No. 20210402 / M/E Reference 210021
Revised per Addendum No. 1
SHEET METAL AND DUCTWORK ACCESSORIES CONSTRUCTION 233100 - 20
C. Sealer is applied to the outside of the joint and covering the screw heads.
D. Flanged joints shall be made with neoprene rubber gaskets.
3.7 TEST OF DUCTWORK
A. Conduct duct leakage tests per SMACNA "HVAC Air Duct Leakage Test Manual" and
per the requirements of the 2015 International Energy Conservation Code, for all
ductwork systems designed to operate at static pressures of 3.0 in. w.g. or greater.
Representative sections totaling no less than 25% of the total duct area, per system, for
the designated pressure class shall be tested as well as all associated ductwork located
out-of-doors. All areas shall be as selected by the Engineer. Positive pressure leakage
testing is acceptable for negative pressure ductwork. The rate of air leakage (CL) must
be less than or equal to 4.0, as determined by equation 4 - 8 in 2015 IECC, which reads:
CL=F/P0.65 where F = measured leakage rate in CFM per 100 sq. ft. of duct surface, and P
= static pressure of the test. When leakage above stated limits occurs, ascertain location
of leaks and repair as required. Repeat tests as required to obtain allowable leakage rates.
Prepare a report similar to that suggested by SMACNA and submit for review. Duct
testing shall be conducted in the presence of the Owner's Representative.
B. Provide test reports indicating pressure tests performed. Include date, section tested, test
pressure and leakage rate.
C. Ductwork not required to be tested for leakage, shall be checked and guaranteed to meet
the standards of the specified SMACNA Duct Seal Class A. Air balancing and testing
shall be used to determine satisfactory operation of duct systems. Balancing reports
indicating excessive leakage amounts shall be required to rebuild, repair or seal ductwork
having excessive leakage.
C.D. Provide Grease Duct Testing as required by 2020 Mechanical Code of New York
State Section 506.3.2.5.
3.8 DAMPERS AND AIR CONTROL DEVICES
A. Provide volume dampers at all air outlets, diffusers, grilles and as noted on plans.
Provide volume dampers at all low pressure supply, return and exhaust, branch ducts and
as noted on the plans.
B. Provide dampers necessary to permit proper balancing of air quantities. Comply with
code requirements for smoke and fire control. Prevent introduction of uncontrolled
outside air into building through roof and wall openings.
C. When dampers are installed in acoustically lined ductwork, install with insulated "build-
outs" per SMACNA.
D. Install fire dampers in accordance with "Fire Dampers" Section and applicable codes.
E. Install all dampers furnished as part of "Building Management System" Section.
TENANT FIT-OUT FOR ITHACA BEER COMPANY - SAI
411-415 College Avenue, Ithaca, NY 14850
HOLT Project No. 20210402 / M/E Reference 210021
Revised per Addendum No. 1
SHEET METAL AND DUCTWORK ACCESSORIES CONSTRUCTION 233100 - 21
3.9 ACCESS DOORS
A. Provide for access to upstream side of duct mounted reheat coils, dampers, damper
motors, fire dampers, smoke dampers, smoke detectors, control devices, fan bearings, and
equipment requiring periodic inspection or service. Provide labels for fire and smoke
dampers as called for in Part 2 - Products.
B. For ducts that are too small to install an access door of the minimum specified size,
provide a 12 in. long section of removable ductwork for maintenance and inspection
access. Removable ductwork shall be fastened between device requiring access and next
duct section with duct flanges or Donaldson Torit clamp with PVC foam seal. For ducts
that are required to be insulated, provisions shall be made to allow insulation to be easily
removed and re-installed.
C. Provide access service openings as required by NFPA 96 and 2020 Mechanical Code of
New York State Section 506.3.8 and 506.3.9 at 20 ft. intervals along horizontal ducts
and at each vertical riser for kitchen hood exhaust.
3.10 DUCT SUPPORTS
A. Provide per SMACNA, same material as duct. Hanger bands to extend down sides and
turn under bottom 2 in. Minimum two metal screws per hanger. Angle iron on larger
duct spaced per building structural system but not greater that 8 ft. Provide extra support
angles as required.
3.11 AIR AND WATERTIGHT DUCTWORK
A. Where water and snow may accumulate on ductwork or where odors or corrosive gasses
may collect, ductwork and plenums shall be made watertight by soldering, brazing or
welding of joints. Grade ducts down toward waste points and/or toward louvers. Provide
valve and drain piping from low point to waste point.
1. Kitchen hood exhaust ductwork.
B. Grease Duct to be installed as required by 2020 Mechanical Code of New York State
Section 506.3.7.
3.12 ACOUSTIC-THERMAL DUCT LINING
A. Increase metal duct dimensions to accommodate lining. Adhere lining to interior side of
duct; minimum 90% coverage of Benjamin Foster 85-20 fire retardant adhesive, UL
approved. Stapling method of attaching will not be permitted. Mechanical fasteners
shall not pierce the sheet metal. Installing fasteners with spacing as per SMACNA
Standards. Multiple layers of liner to achieve indicated thickness is prohibited.
B. Abutting edges of acoustic linings shall be sealed with a fire resistant neoprene coating,
and exposed edges of acoustic linings shall be installed with sheet metal nosing to
prevent erosion.
TENANT FIT-OUT FOR ITHACA BEER COMPANY - SAI
411-415 College Avenue, Ithaca, NY 14850
HOLT Project No. 20210402 / M/E Reference 210021
Revised per Addendum No. 1
SHEET METAL AND DUCTWORK ACCESSORIES CONSTRUCTION 233100 - 22
C. Lining shall not impart odor to the air, delaminate or be loosened by the airstream under
normal operating conditions. Lining which is damaged during fabrication or shipment
shall not be installed.
D. Supply ductwork downstream of terminal units shall have 1-1/2 in. thick acoustical lining
for a minimum of 10 feet. All air outlets shall be installed downstream of this minimum
distance.
3.13 SMOKE DETECTION
A. Smoke detectors shall be furnished by Division 26 "Electrical". This Contractor shall
install detectors located in ductwork. Clearly indicate locations of smoke detectors on the
sheet metal shop drawings.
B. Increase duct size at smoke detectors, where required for proper installation, per smoke
detector manufacturer's recommendations. Coordinate minimum duct size required with
Division 26 "Electrical".
3.14 DUCT SEALING
A. Preparation:
1. Clean surfaces of dirt, oil, grease and loose of foreign matter that could impair
adhesion, using soap and water or solvent.
2. Allow surfaces to dry completely before proceeding.
B. Installation of Sealant System:
1. Apply sealant system to duct joints, fasteners, and seams in accordance with
manufacturer's instructions.
2. Apply sealant by brush, putty knife or caulk gun, to full coverage. Remove
excess adhesive immediately.
3. Completely seal duct joint, fasteners and seams without voids, to a minimum 20
mil thick wet film.
4. Apply and store at ambient temperature of 40F to 100F; and protect from
freezing until dry.
C. Field Quality Control:
1. Allow duct sealant system to cure a minimum of 72 hours before operating the
system.
2. Do not apply external duct insulation or coatings until the joints have been
inspected by the Owner's Representative.
TENANT FIT-OUT FOR ITHACA BEER COMPANY - SAI
411-415 College Avenue, Ithaca, NY 14850
HOLT Project No. 20210402 / M/E Reference 210021
Revised per Addendum No. 1
SHEET METAL AND DUCTWORK ACCESSORIES CONSTRUCTION 233100 - 23
EXHIBIT I - DUCTWORK MATERIALS
SERVICE MATERIAL SPECIAL REQUIREMENTS
Supply, return, vent, relief,
outside and exhaust
Lock forming quality, galvanized
steel ASTM A653 and A924,
galvaneal/paint grip if not insulated
and exposed
Joints and features as called for
Accessories, dampers and air
turns
Same material and gauge as parent
duct
---------------
Exposed Kitchen hood Type 304 stainless steel, with #3
polished finish where exposed
Braze or weld airtight/watertight
Concealed kitchen hood
exhaust
16 gauge black steel Joints welded airtight/watertight,
flanged and gasketed at
connections to hood
END OF SECTION 233100