HomeMy WebLinkAbout233300 DUCTWORK ACCESSORIESTHE KENT
23 33 00 - 1
THE KENT Issue Date 05.09.18 DUCTWORK ACCESSORIES
THE KENT
SECTION 23 33 00 - DUCTWORK ACCESSORIES
PART 1 - GENERAL
1.01 RELATED SECTIONS:
A. Drawings, general provisions of the Contract, including General and Supplementary
Conditions, Division-1 Specification Sections and Division 20 Specification Sections, apply to
work of this Section.
1.02 DESCRIPTION OF WORK:
A. Extent of Ductwork Accessories required by this section is indicated on the drawings and
schedules, and by requirements of this section. Types of ductwork accessories specified in
this Section include the following:
1. Backdraft and pressure relief dampers.
2. Manual volume dampers.
3. Control dampers.
4. Fire dampers.
5. Ceiling radiation dampers.
6. Flange connectors.
7. Turning vanes.
8. Duct-mounted access doors.
9. Flexible connectors.
10. Flexible ducts.
11. Duct accessory hardware.
12. Wall Louvers
1.03 CODE COMPLIANCE:
A. SMACNA Compliance: Comply with applicable portions of SMACNA "HVAC Duct Construction
Standards - Metal and Flexible".
B. Industry Standards: Comply with ASHRAE recommendations pertaining to construction of
ductwork accessories, except as otherwise indicated.
C. UL Compliance: Construct, test, and label fire dampers in accordance with UL Standard 555
"Fire Dampers and Ceiling Dampers".
D. UL Compliance: Construct, test, and label smoke dampers in accordance with UL Standard
555S “Leakage Rated Dampers for use in Smoke Control Systems”.
E. UL Compliance: Construct, test, and label combination fire-smoke dampers in accordance with
UL Standard 555/UL555S
F. NFPA Compliance: Comply with applicable provisions of NFPA 90A "Air Conditioning and
Ventilating Systems", pertaining to installation of ductwork accessories.
THE KENT
23 33 00 - 2
THE KENT Issue Date 05.09.18 DUCTWORK ACCESSORIES
THE KENT
G. NFPA Compliance: Comply with applicable provisions of NFPA 90B “Installation of Warm Air
Heating and Air Conditioning Systems.”
1.04 SUBMITTALS:
A. Product Data: For each type of product.
1. For duct silencers, include pressure drop and dynamic insertion loss data. Include
breakout noise calculations for high transmission loss casings.
B. Shop Drawings: For duct accessories. Include plans, elevations, sections, details and
attachments to other work.
1. Detail duct accessories fabrication and installation in ducts and other construction.
Include dimensions, weights, loads, and required clearances; and method of field
assembly into duct systems and other construction. Include the following:
a. Special fittings.
b. Manual volume damper installations.
c. Control-damper installations.
d. Fire-damper and ceiling damper installations, including sleeves; and duct-
mounted access doors.
e. Wiring Diagrams: For power, signal, and control wiring.
C. Coordination Drawings: Refer to Specification Section 23 31 13 Ductwork for requirements for
Coordination Drawings.
D. Source quality-control reports.
E. Operation and Maintenance Data for air duct accessories to include in operation and
maintenance manuals.
1.05 EXTRA MATERIALS:
A. Furnish extra materials that match products installed and that are packaged with protective
covering for storage and identified with labels describing contents.
1. Fusible Links: Furnish quantity equal to 10 percent of amount of each type installed.
PART 2 - PRODUCTS
2.01 ASSEMBLY DESCRIPTION:
A. Comply with NFPA 90A, "Installation of Air Conditioning and Ventilating Systems," and with
NFPA 90B, "Installation of Warm Air Heating and Air Conditioning Systems."
B. Comply with SMACNA's "HVAC Duct Construction Standards - Metal and Flexible" for
acceptable materials, material thicknesses, and duct construction methods unless otherwise
indicated. Sheet metal materials shall be free of pitting, seam marks, roller marks, stains,
discolorations, and other imperfections.
2.02 MATERIALS:
A. Galvanized Sheet Steel: Comply with ASTM A 653.
THE KENT
23 33 00 - 3
THE KENT Issue Date 05.09.18 DUCTWORK ACCESSORIES
THE KENT
1. Galvanized Coating Designation: G90.
2. Exposed-Surface Finish: Mill phosphatized.
B. Stainless-Steel Sheets: Comply with ASTM A 480, Type 304, and having a mill finish for
concealed ducts and No. 4 directional polish finish for exposed ducts. Protect finished
surfaces with mill-applied adhesive protective paper, maintained through fabrication and
installation.
C. Aluminum Sheets: Comply with ASTM B 209, Alloy 3003, Temper H14; with mill finish for
concealed ducts and standard, 1-side bright finish for exposed ducts.
D. Extruded Aluminum: Comply with ASTM B 221, Alloy 6063, Temper T6.
E. Reinforcement Shapes and Plates: Galvanized-steel reinforcement where installed on
galvanized sheet metal ducts; compatible materials for aluminum and stainless-steel ducts.
F. Tie Rods: Galvanized steel, 1/4-inch minimum diameter for lengths 36 inches or less; 3/8-inch
minimum diameter for lengths longer than 36 inches.
2.03 BACKDRAFT AND PRESSURE RELIEF DAMPERS:
A. Manufacturers: Subject to compliance with requirements, provide products by one of the
following:
1. Air Balance Inc.; a division of Mestek, Inc
2. American Warming and Ventilating; a division of Mestek, Inc.
3. Cesco products, a division of Mestek, Inc.
4. Greenheck Fan Corporation.
5. Nailor Industries, Inc.
6. NCA Manufacturing, Inc.
7. Pottorff.
8. Ruskin Company.
9. Vent Products Company, Inc.
B. Description: Gravity balanced.
C. Maximum Air Velocity: 2000 fpm.
D. Frame: 0.090-inch-thick extruded aluminum, with welded corners or mechanically attached. 2
inch frame with channel frame, rear flange or front flange as shown or required for the duty.
E. Blades: Multiple single-piece blades, off-center pivoted maximum 6-inch width, 0.025-inch-
thick, roll-formed aluminum with sealed edges.
F. Blade Action: Parallel.
G. Blade Seals: Extruded vinyl, mechanically locked.
H. Tie Bars and Brackets: Aluminum.
I. Return Spring: Adjustable tension.
J. Bearings: synthetic pivot bushings.
THE KENT
23 33 00 - 4
THE KENT Issue Date 05.09.18 DUCTWORK ACCESSORIES
THE KENT
K. Accessories:
1. Adjustment device to permit setting for varying differential static pressure.
2. Counterweights and spring-assist kits for vertical airflow installations.
3. Electric actuators.
4. Chain pulls.
5. Retain one of two "Screen Mounting" subparagraphs below.
6. Screen Mounting: Front mounted in sleeve.
7. Sleeve Thickness: 20 gage minimum.
8. Sleeve Length: 6 inches minimum.
9. Screen Mounting: Rear mounted.
10. Screen Material: Aluminum
11. Screen Type: Bird.
12. 90-degree stops.
2.04 MANUAL VOLUME DAMPERS:
A. Manufacturers: Subject to compliance with requirements, provide products by one of the
following:
1. Air Balance Inc.; a division of Mestek, Inc
2. American Warming and Ventilating; a division of Mestek, Inc.
3. Greenheck Fan Corporation.
4. McGill AirFlow, Inc.
5. Nailor Industries, Inc.
6. NCA Manufacturing, Inc.
7. Pottorff.
8. Ruskin Company.
9. Trox USA, Inc.
10. United Enertech
11. Vent Products Company, Inc.
12. Young Regulator
B. Standard, Steel, Manual Volume Dampers:
1. Standard leakage rating with linkage outside airstream.
2. Suitable for horizontal or vertical applications.
3. Frames:
a. Frame: Hat-shaped, 22 gage galvanized steel.
b. Mitered and welded corners.
c. Flanges for attaching to walls and flangeless frames for installing in ducts.
4. Blades:
a. Multiple or single blade.
b. Multiple blade dampers to be opposed-blade design.
c. Stiffen damper blades for stability.
d. Minimum 22 age Galvanized-steel.
5. Blade Axles: Galvanized steel.
6. Bearings:
a. Molded synthetic.
b. Dampers in ducts with pressure classes of 3-inch wg or less shall have axles
full length of damper blades and bearings at both ends of operating shaft.
7. Tie Bars and Brackets: Galvanized steel.
THE KENT
23 33 00 - 5
THE KENT Issue Date 05.09.18 DUCTWORK ACCESSORIES
THE KENT
C. Standard, Aluminum, Manual Volume Dampers:
1. Standard leakage rating with linkage outside airstream.
2. Suitable for horizontal or vertical applications.
3. Frames: Hat-shaped, 0.10-inch-thick, aluminum sheet channels; frames with flanges
for attaching to walls and flangeless frames for installing in ducts.
4. Blades:
a. Multiple or single blade.
b. Multiple blade dampers to be opposed-blade design.
c. Stiffen damper blades for stability.
d. Roll-Formed Aluminum Blades: 0.10-inch-thick aluminum sheet.
5. Blade Axles: Galvanized steel.
6. Bearings:
a. Molded synthetic.
b. Dampers in ducts with pressure classes of 3-inch wg or less shall have axles
full length of damper blades and bearings at both ends of operating shaft.
7. Tie Bars and Brackets: Aluminum.
D. Jackshaft:
1. Material: Galvanized-steel pipe rotating within pipe-bearing assembly mounted on
supports at each mullion and at each end of multiple-damper assemblies.
2. Length and Number of Mountings: As required to connect linkage of each damper in
multiple-damper assembly.
E. Damper Hardware:
1. Zinc-plated, die-cast core with dial and handle made of 3/32-inch-thick zinc-plated
steel, and a 3/4-inch hexagon locking nut.
2. Include center hole to suit damper operating-rod size.
3. Include elevated platform for insulated duct mounting.
2.05 CONTROL DAMPERS:
A. Manufacturers: Subject to compliance with requirements, provide products by one of the
following:
1. American Warming and Ventilating; a division of Mestek, Inc.
2. Arrow United Industries, a division of Mestek, Inc.
3. Cesco Products, a division of Mestek, Inc.
4. Greenheck Fan Corporation.
5. McGill AirFlow, Inc.
6. MetalForm Manufacturing, Inc.
7. Nailor Industries, Inc.
8. NCA Manufacturing, Inc.
9. Pottorff.
10. Ruskin Company.
11. Vent Products Company, Inc.
12. Young Regulator
B. Low-leakage rating with linkage outside the airstream, and bearing AMCA's Certified Ratings
THE KENT
23 33 00 - 6
THE KENT Issue Date 05.09.18 DUCTWORK ACCESSORIES
THE KENT
Seal for both air performance and air leakage.
C. Frames:
1. Hat shaped.
2. Minimum 16 gage galvanized steel.
3. Mitered and welded corners.
D. Blades:
1. Multiple blade with maximum blade width of 6 inches.
2. Opposed blade design.
3. Galvanized-steel.
4. 14 gage.
5. Blade Edging: Closed-cell neoprene.
E. Blade Axles: 1/2-inch-diameter; galvanized steel blade-linkage hardware of zinc-plated steel
and brass; ends sealed against blade bearings.
1. Operating Temperature Range: From minus 40 to plus 200 deg F.
F. Bearings:
1. Molded synthetic.
2. Dampers in ducts with pressure classes of 3-inch wg or less shall have axles full
length of damper blades and bearings at both ends of operating shaft.
3. Thrust bearings at each end of every blade.
2.06 OUTSIDE AIR AND EXHAUST AIR DAMPERS:
A. Manufacturers: Subject to compliance with requirements, provide products by one of the
following:
1. TAMCO Series 9000 as manufactured by T. A. Morrison & Co., Inc.
2. Greenheck Model ICD
3. Ruskin CD40x2
B. Extruded aluminum (6063T5) damper frame shall not be less than .080" in thickness. Damper
frame to be 4" deep.
1. Frames for outside air and exhaust air dampers shall be insulated with poly-styrofoam
on three sides if "Installed in Duct" type and on four sides if "Flanged to Duct" type.
C. Blades to be extruded aluminum (6063T5) profiles.
1. Blades for outside air and exhaust air dampers shall be internally insulated with
expanded polyurethane foam and shall be thermally broken. Complete blade shall
have an insulating factor of R-2.29 and a temperature index of 55.
D. Blade seals shall be of extruded EPDM. Frame seals shall be of extruded silicone. Seals to be
secured in an integral slot within the aluminum extrusions.
E. Bearings shall be composed of a Celcon inner bearing fixed to a 7/16” aluminum hexagon
THE KENT
23 33 00 - 7
THE KENT Issue Date 05.09.18 DUCTWORK ACCESSORIES
THE KENT
blade pin, rotating within a polycarbonate outer bearing inserted in the frame, resulting in no
metal-to-metal or metal-to-plastic contact.
F. Linkage hardware shall be installed in the frame side and constructed of aluminum and
corrosion-resistant, zinc-plated steel, complete with cup-point trunnion screws for a slip-proof
grip.
G. Dampers shall be designed for operation in temperatures ranging between -40°F and 185°F.
H. Dampers shall be available with either opposed blade action or parallel blade action.
I. Leakage shall not exceed 3 cfm/ft² against 1” w.g. differential static pressure.
J. Pressure drop of a fully open 48" x 48" damper shall not exceed 0.03" w.g. at 1000 fpm.
K. Dampers shall be made to size required without blanking off free area.
L. Dampers shall be available in two mounting types: i.e., "Installed in Duct" or "Flanged to Duct"
as shown or required for the duty.
M. Installation of dampers must be in accordance with current manufacturer's installation
instructions.
N. Provide supplemental intermediate or tubular steel structural support to resist applied pressure
loads for dampers that consist of two or more sections in both height and width.
O. Dampers shall accept a direct mount actuator provided by control contractor.
P. Dampers shall be installed in a manner that will accommodate air flow monitoring stations
immediately behind the damper set where required by the sequence of operations.
2.07 FIRE DAMPERS:
A. Manufacturers: Subject to compliance with requirements, provide products by one of the
following:
1. Air Balance Inc.; a division of Mestek, Inc
2. Arrow United Industries, a division of Mestek, Inc.
3. Greenheck Fan Corporation.
4. McGill AirFlow, Inc.
5. Nailor Industries, Inc.
6. NCA Manufacturing, Inc.
7. Pottorff.
8. Prefco, Perfect Air Control, Inc.
9. Ruskin Company.
10. United Enertech
B. Type: Dynamic; rated and labeled according to UL 555 by a nationally recognized testing lab.
C. Closing rating in ducts up to 4-inch wg static pressure class and minimum 2000-fpm velocity.
D. 1-1/2 Hour Dynamic Fire Damper:
THE KENT
23 33 00 - 8
THE KENT Issue Date 05.09.18 DUCTWORK ACCESSORIES
THE KENT
1. Meets UL 555 and NFPA 90A requirements for duct penetrations of fire rated walls,
partitions, and floors with fire resistance ratings of less than 3 hours.
2. 20 gauge galvanized steel channel.
3. 24 gauge galvanized steel bladed curtain.
4. 165 degrees fusible link.
5. Suitable for vertical or horizontal mounting.
6. Fire damper blades shall be out of the air stream so that duct size is maintained.
7. Damper shall be provided with an integral steel sleeve suitable for the substrate into
which it is to be installed. Provide integral “picture frame” mounting angles
E. 1 1/2 Hour Dynamic Multiple Blade Fire Damper:
1. These dampers are to be used in lieu of Style LO or LR for flat oval or round duct
when duct size is such that the largest single section UL listed LO or LR damper is
exceeded.
2. Meets UL 555 and NFPA 90A requirements for duct penetrations of fire rated walls,
partitions, and floors with fire resistance ratings of less than 3 hours.
3. 20 gauge galvanized steel channel.
4. 24 gauge galvanized steel bladed curtain.
5. 165 deg F fusible link.
6. Suitable for vertical or horizontal mounting.
7. Fire damper blades shall be opposed blade airfoil type.
8. Damper shall be provided with an integral steel sleeve suitable for the substrate into
which it is to be installed. Provide integral “picture frame” mounting angles
F. 3 Hour Dynamic Fire Damper:
1. Meets UL 555 and NFPA 90A requirements for duct penetrations of fire rated walls,
partitions, and floors with fire resistance ratings of 3 hours or more.
2. 18 gauge galvanized steel channel.
3. 22 gauge galvanized steel bladed curtain.
4. 165 deg F fusible link.
5. Suitable for vertical and horizontal mounting.
6. Fire damper blades shall be out of the air stream so that duct size is maintained.
7. Damper shall be provided with an integral steel sleeve suitable for the substrate into
which it is to be installed. Provide integral “picture frame” mounting angles
2.08 CEILING RADIATION DAMPERS:
A. Manufacturers: Subject to compliance with requirements, provide products by one of the
following:
1. Arrow United Industries, a division of Mestek, Inc.
2. Cesco Products, a division of Mestek, Inc.
3. Nailor Industries, Inc.
4. NCA Manufacturing, Inc.
5. Pottorff.
6. Prefco, Perfect Air Control, Inc.
7. Ruskin Company.
B. General Requirements:
1. Labeled according to UL 555C by a nationally recognized testing lab.
2. Comply with construction details for tested floor- and roof-ceiling assemblies as
THE KENT
23 33 00 - 9
THE KENT Issue Date 05.09.18 DUCTWORK ACCESSORIES
THE KENT
indicated in UL's "Fire Resistance Directory."
C. Frame: Galvanized sheet steel, round or rectangular, style to suit ceiling construction.
D. Blades: Galvanized sheet steel with refractory insulation.
E. Heat-Responsive Device: Replaceable, 165 deg F rated, fusible links.
F. Fire Rating: 1 hours.
2.09 FLANGE CONNECTORS:
A. Manufacturers: Subject to compliance with requirements, provide products by one of the
following:
1. Ductmate Industries, Inc.
2. Nexus PDQ; Division of Shilco Holdings Inc.
3. Ward Industries, Inc.; a division of Hart & Cooley, Inc.
B. Description: Add-on or roll-formed, factory-fabricated, slide-on transverse flange connectors,
gaskets, and components.
C. Material: Galvanized steel.
D. Gage and Shape: Match connecting ductwork.
2.10 TURNING VANES:
A. Manufacturers: Subject to compliance with requirements, provide products by one of the
following:
1. Ductmate Industries, Inc.
2. Duro Dyne Inc.
3. Elgen Manufacturing.
4. Krueger
5. METALAIRE, Inc.
6. Titus
7. SEMCO Incorporated.
B. Manufactured Turning Vanes for Metal Ducts: Curved blades of galvanized sheet steel;
support with bars perpendicular to blades set; set into vane runners suitable for duct mounting.
1. Acoustic Turning Vanes: Fabricate airfoil-shaped aluminum extrusions with perforated
faces and fibrous-glass fill.
C. General Requirements: Comply with SMACNA's "HVAC Duct Construction Standards - Metal
and Flexible"; Figures 4-3, "Vanes and Vane Runners," and 4-4, "Vane Support in Elbows."
D. Vane Construction: Single wall for ducts up to 24 inches wide and double wall for larger
dimensions.
THE KENT
23 33 00 - 10
THE KENT Issue Date 05.09.18 DUCTWORK ACCESSORIES
THE KENT
2.11 DUCT-MOUNTED ACCESS DOORS:
A. Manufacturers: Subject to compliance with requirements, provide products by one of the
following:
1. American Warming and Ventilating; a division of Mestek, Inc.
2. Cesco Products; a division of Mestek, Inc.
3. Ductmate Industries, Inc.
4. Elgen Manufacturing.
5. Greenheck Fan Corporation.
6. McGill AirFlow LLC.
7. Nailor Industries Inc.
8. Pottorff.
9. United Enertech
10. Ventfabrics, Inc.
B. Duct-Mounted Access Doors: Fabricate access panels according to SMACNA's "HVAC Duct
Construction Standards - Metal and Flexible"; Figures 7-2, "Duct Access Doors and Panels,"
and 7-3, "Access Doors - Round Duct."
1. Door:
a. Double wall, rectangular.
b. Galvanized sheet metal with insulation fill and thickness as indicated for duct
pressure class.
c. Hinges and Latches: continuous piano hinge and cam latches.
d. Fabricate doors airtight and suitable for duct pressure class.
2. Frame: Galvanized sheet steel, with bend-over tabs and foam gaskets.
3. Number of Hinges and Locks:
a. Access Doors Less Than 12 Inches Square: No hinges and two sash locks.
b. Access Doors up to 18 Inches Square: Continuous hinge and two sash locks.
c. Access Doors up to 24 by 48 Inches Three hinges and two compression
latches with outside and inside handles.
d. Access Doors Larger than 24 by 48 Inches Four hinges and three
compression latches with outside and inside handles.
2.12 FIRE RATED DUCT ACCESS PANEL ASSEMBLIES:
A. Manufacturers: Subject to compliance with requirements, provide products by one of the
following:
1. Ductmate Industries, Inc.
2. Flame Gard, Inc.
3. 3M.
B. Labeled according to UL 1978 by a nationally recognized testing lab.
C. Panel and Frame: Minimum thickness 0.0428-inch stainless steel.
D. Fasteners: Stainless steel. Panel fasteners shall not penetrate duct wall.
E. Gasket: Comply with NFPA 96; grease-tight, high-temperature ceramic fiber, rated for
minimum 2000 deg F.
THE KENT
23 33 00 - 11
THE KENT Issue Date 05.09.18 DUCTWORK ACCESSORIES
THE KENT
F. Minimum Pressure Rating: 10-inch wg, positive or negative.
2.13 FLEXIBLE CONNECTORS:
A. Manufacturers: Subject to compliance with requirements, provide products by one of the
following:
1. Ductmate Industries, Inc.
2. Duro Dyne Inc.
3. Elgen Manufacturing.
4. Ventfabrics, Inc.
B. Materials: Flame-retardant or noncombustible fabrics.
C. Coatings and Adhesives: Comply with UL 181, Class 1.
D. Metal-Edged Connectors: Factory fabricated with a fabric strip 5-3/4 inches wide attached to
two strips of 2-3/4-inch-wide, 0.028-inch-thick, galvanized sheet steel or 0.032-inch-thick
aluminum sheets. Provide metal compatible with connected ducts.
E. Indoor System, Flexible Connector Fabric: Glass fabric double coated with neoprene.
1. Minimum Weight: 26 oz./sq. yd.
2. Tensile Strength: 480 lbf/inch in the warp and 360 lbf/inch in the filling.
3. Service Temperature: Minus 40 to plus 200 deg F.
F. 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-inch movement at
start and stop.
2.14 INSULATED FLEXIBLE CONNECTORS:
A. Manufacturers: Subject to compliance with requirements, provide products by one of the
following:
1. Duro Dyne Inc.
2. J.P. Environmental Products
B. Materials: Flame-retardant or noncombustible fabrics.
THE KENT
23 33 00 - 12
THE KENT Issue Date 05.09.18 DUCTWORK ACCESSORIES
THE KENT
C. Coatings and Adhesives: Comply with UL 181, Class 1.
D. Metal-Edged Connectors: Factory fabricated with a fabric strip 5-3/4 inches wide attached to
two strips of 2-3/4-inch-wide, 0.028-inch-thick, galvanized sheet steel or 0.032-inch-thick
aluminum sheets. Provide metal compatible with connected ducts.
E. Insulated Flexible Ductwork Connectors. Two layers of fabric encapsulating 1” nominal
thickness of fiberglass insulation.
1. Fabric layers shall be 30 oz. “Ventglas” (or equal) neoprene coated fabric, minimum
30 oz. per square yard.
2. Fabric layers shall be shielded with metal on both sides at the seam, attached with a
mechanical metal-to-fabric bond.
3. Tensile Strength: 480 lb per inch in the wrap and 360 lb per inch in the filling.
4. Flexible connection fabric shall be approved by the Underwriter's Laboratories, Inc.,
and comply with UL-191-1967.
2.15 FLEXIBLE DUCTS:
A. Manufacturers: Subject to compliance with requirements, provide products by one of the
following:
1. McGill Airflow LLC.
2. Atco
3. Clevaflex
4. Flexmaster U.S.A., Inc.
5. Hart & Cooley, Inc.
B. Insulated, Flexible Duct: UL 181, Class 1, black polymer film supported by helically wound,
spring-steel wire; fibrous-glass insulation; aluminized vapor-barrier film.
1. Pressure Rating: 4-inch wg positive and 0.5-inch wg negative.
2. Maximum Air Velocity: 4000 fpm.
3. Temperature Range: Minus 20 to plus 175 deg F.
4. Insulation R-Value:
a. Multifamily Applications (in apartments only): R3.5
b. Commercial Applications (in areas other than apartments, i.e. common and
amenity areas): R6
5. Max. 25/50 Flame spread/Smoke developed rating
6. Green Guard certified
C. Flexible Duct Connectors:
1. Clamps for Multifamily Applications (in apartments only): Nylon strap in sizes 3
through 18 inches, to suit duct size.
a. Non-metallic clamps shall be listed and labeled in accordance with Standard
UL 181B and marked 181 B-C.
b. Use of non-metallic clamps shall be limited to 4 in. w.g. positive pressure.
2. Clamps for Commercial Applications (in areas other than apartments, i.e. common and
amenity areas): Stainless-steel band with cadmium-plated hex screw to tighten band
with a worm-gear action.
THE KENT
23 33 00 - 13
THE KENT Issue Date 05.09.18 DUCTWORK ACCESSORIES
THE KENT
2.16 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. Adhesives: High strength, quick setting, neoprene based, waterproof, and resistant to
gasoline and grease.
2.17 WALL LOUVERS:
A. Rectangular Intake, Relief, and Exhaust Louvers - Aluminum – Storm-proof
1. Maximum pressure drop 0.2 inch W.G. at 1000 FPM free area velocity.
2. Expanded, flattened aluminum bird screen of 1/2 inch by 0.063 material tightly
stretched and suitably braced to prevent sagging.
3. Frame shall be 6 inches deep and constructed of 6063T5 extruded aluminum of 0.100
inch nominal wall thickness.
4. Blades shall be constructed of 6063T5 extruded aluminum of 0.081 inch nominal wall
thickness. The maximum blade length shall be 65 inches. Blades to be the drainable
type set at minimum 37-1/2 inch degree angle.
5. Sills and jambs shall be one piece structural members. Corners to be mitered and
continuously heliarc welded. Structural supports designed for 20 PSF wind load.
Include provisions for expansion at jambs with slideable interlocked mullions.
Fastenings shall be aluminum or stainless steel.
6. Finish type to be baked enamel, color as selected by Architect.
7. Shop drawings of louvers and colors must be approved by the Architect/Engineer
before fabrication of louvers is started.
8. No dissimilar metals, which might induce electrolysis, shall be used in the
construction, screening, or mounting of the louvers.
PART 3 - EXECUTION
3.01 INSTALLATION:
A. Install duct accessories according to applicable details in SMACNA's "HVAC Duct
Construction Standards - Metal and Flexible".
B. Install duct accessories of materials suited to duct materials; use galvanized-steel accessories
in galvanized-steel ducts, stainless-steel accessories in stainless-steel ducts, and aluminum
accessories in aluminum ducts.
C. Install backdraft dampers at inlet of exhaust fans or exhaust ducts as close as possible to
exhaust fan unless otherwise indicated.
D. Install volume dampers at points on supply, return, and exhaust systems where branches
extend from larger ducts. Where dampers are installed in ducts having duct liner, install
dampers with hat channels of same depth as liner, and terminate liner with nosing at hat
channel.
1. Install steel volume dampers in steel ducts.
E. Set dampers to fully open position before testing, adjusting, and balancing.
THE KENT
23 33 00 - 14
THE KENT Issue Date 05.09.18 DUCTWORK ACCESSORIES
THE KENT
F. Install test holes at fan inlets and outlets and elsewhere as indicated.
G. Install fire dampers according to UL listing.
H. Install duct access doors on sides of ducts to allow for inspecting, adjusting, and maintaining
accessories and equipment at the following locations:
1. On both sides of duct coils.
2. Upstream from duct filters.
3. At outdoor-air intakes and mixed-air plenums.
4. At drain pans and seals.
5. Downstream from manual volume dampers, control dampers, backdraft dampers, and
equipment.
6. Adjacent to and close enough to fire dampers, to reset or reinstall fusible links.
Access doors for access to fire dampers having fusible links shall be pressure relief
access doors and shall be outward operation for access doors installed upstream from
dampers and inward operation for access doors installed downstream from dampers.
7. At each change in direction and at maximum 50-foot spacing.
8. Upstream and downstream from turning vanes.
9. Upstream or downstream from duct silencers.
10. Control devices requiring inspection.
11. Elsewhere as indicated.
I. Install access doors with swing against duct static pressure.
J. Access Door Sizes:
1. One-Hand or Inspection Access: 8 by 5 inches.
2. Two-Hand Access: 12 by 6 inches.
3. Head and Hand Access: 18 by 10 inches.
4. Head and Shoulders Access: 21 by 14 inches.
5. Body Access: 25 by 14 inches.
6. Body plus Ladder Access: 25 by 17 inches.
K. Label access doors according to Section 20 01 90 "Mechanical Identification" to indicate the
purpose of access door.
L. Install flexible connectors to connect ducts to equipment.
M. Connect terminal units to supply ducts with maximum 12-inch lengths of flexible duct. Do not
use flexible ducts to change directions.
N. Provide flexible ductwork where noted on the Drawings. Lengths of flexible ductwork shall not
exceed 6 feet and shall be continuously supported.
1. Exception: Lengths of flexible ductwork shall be permitted to exceed 6 feet when used
in multifamily construction applications.
O. Flexible ductwork shall be supported from above at not to exceed 3'-0" o.c. and shall not lie on
ceiling or light fixtures. Support flexible duct from integral grommet strip or minimum 1"
sheetmetal bands per SMACNA figure 3-10.
P. Install duct test holes where required for testing and balancing purposes.
THE KENT
23 33 00 - 15
THE KENT Issue Date 05.09.18 DUCTWORK ACCESSORIES
THE KENT
Q. Install thrust limits at centerline of thrust, symmetrical on both sides of equipment. Attach
thrust limits at centerline of thrust and adjust to a maximum of 1/4-inch movement during start
and stop of fans.
R. Install wall louvers as denoted and detailed on the Drawings. Seal exterior louvers to building
joints with an approved silicone clear sealant.
1. Sheet Metal Contractor to verify sizes of wall louvers required prior to ordering.
2. Ductwork (where required) shall be fastened completely to louver. Bottom of ductwork
shall be sloped up minimum of 30 degrees toward inside of building to control entry of
water whether shown or not on the drawings. Seal joints with silicone or plastic
sealant.
3. Provide masonry lintels for all louvers installed in masonry walls. Lintel shall extend
minimum 12" beyond opening at each end.
3.02 FIELD QUALITY CONTROL:
A. Tests and Inspections:
1. Operate dampers to verify full range of movement.
2. Inspect locations of access doors and verify that purpose of access door can be
performed.
3. Operate fire dampers to verify full range of movement and verify that proper heat-
response device is installed.
4. Inspect turning vanes for proper and secure installation.
5. Operate remote damper operators to verify full range of movement of operator and
damper.
END OF SECTION
THE KENT
23 33 00 - 16
THE KENT Issue Date 05.09.18 DUCTWORK ACCESSORIES
THE KENT
THIS PAGE IS LEFT INTENTIONALLY BLANK