233300_duct_accessories.pdf

CHICOPEE ARMORY REHABILITATION MMD PROJECT NO. 985101

CHICOPEE, MASSACHUSETTS ISSUED FOR BID - 05/20/11

10090 AIR DUCT ACCESSORIES 233300-1

SECTION 233300

AIR DUCT ACCESSORIES

PART 1 - GENERAL

1.1 RELATED DOCUMENTS

A. Drawings and general provisions of the Contract, including General and Supplementary

Conditions and Division 1 Specification Sections, apply to this Section.

B. The requirements of Section 230100, “Basic Mechanical Requirements” apply to work defined by this Section.

C. The requirements of Section 230500, “Basic Mechanical Materials and Methods” apply to work defined by the Section.

1.2 SUMMARY

A. This Section includes the following:

1. Volume dampers.

2. Motorized control dampers.

3. Fire dampers.

4. Turning vanes.

5. Duct-mounting access doors.

6. Flexible connectors.

7. Flexible ducts.

8. Duct accessory hardware.

9. Louvers.

B. Related Sections include the following:

1. Division 23, Section 230900 "HVAC Instrumentation and Controls" for electric and pneumatic damper actuators.

1.3 SUBMITTALS

A. Product Data: For the following:

1. Volume dampers.

2. Motorized control dampers.

3. Fire dampers.

4. Turning vanes.

5. Duct-mounting access doors.

6. Flexible connectors.

7. Flexible ducts.

8. Louvers.

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B. Shop Drawings: Detail equipment assemblies and indicate dimensions, weights, loads, required clearances, method of field assembly, components, and location and size of each field connection.

1. Special fittings.

2. Manual-volume damper installations.

3. Motorized-control damper installations.

4. Fire-damper, smoke-damper, and combination fire- and smoke-damper installations, including sleeves and duct-mounting access doors.

5. Wiring Diagrams: Power, signal, and control wiring.

1.4 QUALITY ASSURANCE

A. Comply with NFPA 90A, "Installation of Air Conditioning and Ventilating Systems," and

NFPA 90B, "Installation of Warm Air Heating and Air Conditioning Systems."

B. Comply with AMCA 500-D testing for damper rating.

C. 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.

1.5 EXTRA MATERIALS

A. Furnish extra materials described below 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 installed.

PART 2 - PRODUCTS

2.1 MANUFACTURERS

A. Available Manufacturers: Subject to compliance with requirements, manufacturers offering products that may be incorporated into the Work include, but are not limited to, the following:

B. Manufacturers: Subject to compliance with requirements, provide products by one of the following:

1. Backdraft dampers:

a. Air Balance Inc.; a division of Mestek, Inc.

b. American Warming and Ventilating; a division of Mestek, Inc.

c. Cesco Products; a division of Mestek, Inc.

d. Duro Dyne Corp.

e. Greenheck Fan Corporation.

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10090 AIR DUCT ACCESSORIES 233300-3

f. Penn Ventilation Company, Inc.

g. Prefco Products, Inc.

h. Ruskin Company.

i. Vent Products Company, Inc.

j.

2. Volume Dampers:

a. Air Balance Inc.; a division of Mestek, Inc.

b. American Warming and Ventilating; a division of Mestek, Inc.

c. Flexmaster U.S.A., Inc.

d. McGill AirFlow LLC.

e. METALAIRE, Inc.

f. Nailor Industries Inc.

g. Penn Ventilation Company, Inc.

h. Ruskin Company.

i. Vent Products Company, Inc.

3. Motorized control dampers:

a. Air Balance, Inc.

b. American Warming and Ventilating; a division of Mestek, Inc.

c. Cesco Products; a division of Mestek, Inc.

d. Duro Dyne Corp.

e. Greenheck Fan Corporation.

f. McGill AirFlow LLC.

g. METALAIRE, Inc.

h. Nailor Industries Inc.

i. Penn Ventilation Company, Inc.

j. Ruskin Company.

k. Vent Products Company, Inc.

4. Fire dampers:

a. Air Balance Inc.; a division of Mestek, Inc.

b. Cesco Products; a division of Mestek, Inc.

c. Greenheck Fan Corporation.

d. McGill AirFlow Corporation.

e. METALAIRE, Inc.

f. Nailor Industries Inc.

g. Penn Ventilation Company, Inc.

h. Prefco; Perfect Air Control, Inc.

i. Ruskin Company.

j. Vent Products Company, Inc.

k. Ward Industries, Inc.; a division of Hart & Cooley, Inc.

5. :

a.

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10090 AIR DUCT ACCESSORIES 233300-4

6. Manufactured turning vanes:

a. Ductmate Industries, Inc.

b. Duro Dyne Inc.

c. METALAIRE, Inc.

d. Ward Industries, Inc.; a division of Hart & Cooley, Inc.

7. Duct-mounting access doors – rectangular:

a. American Warming and Ventilating; a division of Mestek, Inc.

b. Cesco Products; a division of Mestek, Inc.

c. Ductmate Industries, Inc.

d. Flexmaster U.S.A., Inc.

e. Greenheck Fan Corporation.

f. McGill AirFlow LLC.

g. Nailor Industries Inc.

h. Ventfabrics, Inc.

i. Ward Industries, Inc.; a division of Hart & Cooley, Inc.

8. Flexible connectors:

a. Ductmate Industries, Inc.

b. Duro Dyne Inc.

c. Ventfabrics, Inc.

d. Ward Industries, Inc.; a division of Hart & Cooley, Inc.

9. Flexible ducts:

a. Flexmaster U.S.A., Inc.

b. Hart & Cooley, Inc.

c. McGill AirFlow LLC.

10. Exterior Louvers

a. Ruskin EME

b. Air Concepts

c. AWV

2.2 SHEET METAL MATERIALS

A. Comply with SMACNA's "HVAC Duct Construction Standards--Metal and Flexible" for acceptable materials, material thicknesses, and duct construction methods, unless otherwise indicated.

B. Galvanized Sheet Steel: Lock-forming quality; complying with ASTM A 653/A 653M and having [G60] [G90] coating designation; ducts shall have mill-phosphatized finish for surfaces exposed to view.

C. Reinforcement Shapes and Plates: Galvanized-steel reinforcement where installed on galvanized sheet metal ducts; compatible materials for aluminum and stainless-steel ducts.

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10090 AIR DUCT ACCESSORIES 233300-5

D. 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.

2.3 VOLUME DAMPERS

A. General Description: Factory fabricated, with required hardware and accessories. Stiffen damper blades for stability. Include locking device to hold single-blade dampers in a fixed position without vibration. Close duct penetrations for damper components to seal duct consistent with pressure class.

1. Pressure Classes of 3-Inch wg or Higher: End bearings or other seals for ducts with axles full length of damper blades and bearings at both ends of operating shaft.

B. Standard Volume Dampers: Multiple- or single-blade, parallel- or opposed-blade design as indicated, standard leakage rating, with linkage outside airstream, and suitable for horizontal or vertical applications.

1. Steel Frames: Hat-shaped, galvanized sheet steel channels, minimum of 0.064 inch thick, with mitered and welded corners; frames with flanges where indicated for attaching to walls and flangeless frames where indicated for installing in ducts.

2. Roll-Formed Steel Blades: 0.064-inch- thick, galvanized sheet steel.

3. Blade Axles: Stainless steel .

4. Bearings: [Oil-impregnated bronze] .

5. Tie Bars and Brackets: Galvanized steel.

6. Steel Frames: Hat -shaped, galvanized sheet steel channels, minimum of 0.064 inch thick, with mitered and welded corners; frames with flanges where indicated for attaching to walls and flangeless frames where indicated for installing in ducts.

7. Roll-Formed Steel Blades: 0.064-inch- thick, galvanized sheet steel.

8. Blade Axles: Stainless steel .

9. Bearings: [Oil-impregnated bronze] thrust or ball.

10. Blade Seals: Vinyl .

11. Jamb Seals: Cambered stainless steel .

12. Tie Bars and Brackets: Galvanized steel .

13. Accessories:

a. Include locking device to hold single-blade dampers in a fixed position without vibration.

C. Jackshaft: 1-inch- diameter, galvanized-steel pipe rotating within pipe-bearing assembly mounted on supports at each mullion and at each end of multiple-damper assemblies.

1. Length and Number of Mountings: Appropriate to connect linkage of each damper in multiple-damper assembly.

D. Damper Hardware: 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. Include center hole to suit damper operating-rod size. Include elevated platform for insulated duct mounting.

10090 AIR DUCT ACCESSORIES 233300-6

2.4 MOTORIZED CONTROL DAMPERS

A. General Description: AMCA-rated, opposed-blade design; minimum of 0.1084-inch- thick, galvanized-steel frames with holes for duct mounting; minimum of 0.0635-inch- thick, galvanized-steel damper blades with maximum blade width of 8 inches.

1. Secure blades to 1/2-inch- diameter, zinc-plated axles using zinc-plated hardware, with nylon blade bearings, blade-linkage hardware of zinc-plated steel and brass, ends sealed against spring-stainless-steel blade bearings, and thrust bearings at each end of every blade.

2. Operating Temperature Range: From minus 40 to plus 200 deg F.

3. Provide closed-cell neoprene edging

2.5 FIRE DAMPERS

A. Fire dampers shall be labeled according to UL 555.

B. Fire Rating: 1-1/2 hours.

C. Frame: Curtain type with blades outside airstream [Multiple-blade type]; fabricated with roll-formed, 0.034-inch- thick galvanized steel; with mitered and interlocking corners.

D. Mounting Sleeve: Factory- or field-installed, galvanized sheet steel.

1. Minimum Thickness: 0.138 inch or 0.39 inch thick as indicated and of length to suit application.

2. Exceptions: Omit sleeve where damper frame width permits direct attachment of perimeter mounting angles on each side of wall or floor, and thickness of damper frame complies with sleeve requirements.

E. Mounting Orientation: Vertical or horizontal as indicated.

F. Blades: Roll-formed, interlocking, 0.034-inch- thick, galvanized sheet steel. In place of interlocking blades, use full-length, 0.034-inch- thick, galvanized-steel blade connectors.

G. Fusible Links: Replaceable, 165 deg F rated.

2.6 TURNING VANES

A. Fabricate to 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."

B. Manufactured Turning Vanes: Fabricate 1-1/2-inch- wide, single -vane, curved blades of galvanized sheet steel set 3/4 inch o.c.; support with bars perpendicular to blades set 2 inches o.c.; and set into vane runners suitable for duct mounting.

C. Acoustic Turning Vanes: Fabricate airfoil-shaped aluminum extrusions with perforated faces and fibrous-glass fill.

10090 AIR DUCT ACCESSORIES 233300-7

2.7 DUCT-MOUNTING ACCESS DOORS

A. General Description: 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."

B. Door: Double wall, duct mounting, and rectangular; fabricated of galvanized sheet metal with insulation fill and thickness as indicated for duct pressure class. Include vision panel where indicated. Include 1-by-1-inch butt or piano hinge and cam latches.

1. Frame: Galvanized sheet steel, with bend-over tabs and foam gaskets.

2. Provide number of hinges and locks as follows:

a. Less Than 12 Inches Square: Secure with two sash locks.

b. Up to 18 Inches Square: Two hinges and two sash locks.

c. Up to 24 by 48 Inches: Three hinges and two compression latches.

d. Sizes 24 by 48 Inches and Larger: One additional hinge.

C. Door: Double wall, duct mounting, and round; fabricated of galvanized sheet metal with insulation fill and 1-inch thickness. Include cam latches.

1. Frame: Galvanized sheet steel, with spin-in notched frame.

2.8 FLEXIBLE CONNECTORS

A. General Description: Flame-retardant or noncombustible fabrics, coatings, and adhesives complying with UL 181, Class 1.

B. Metal-Edged Connectors: Factory fabricated with a fabric strip 3-1/2 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. Select metal compatible with ducts.

C. 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.

2.9 FLEXIBLE DUCTS

A. Noninsulated-Duct Connectors: UL 181, Class 1, 2-ply vinyl film supported by helically wound, spring-steel wire.

1. Pressure Rating: 10-inch wg positive and 1.0-inch wg negative.

2. Maximum Air Velocity: 4000 fpm.

3. Temperature Range: Minus 10 to plus 160 deg F.

B. Noninsulated-Duct Connectors: UL 181, Class 1, black polymer film supported by helically wound, spring-steel wire.

10090 AIR DUCT ACCESSORIES 233300-8

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.

C. Noninsulated-Duct Connectors: UL 181, Class 1, multiple layers of aluminum laminate supported by helically wound, spring-steel wire.

1. Pressure Rating: 10-inch wg positive and 1.0-inch wg negative.

2. Maximum Air Velocity: 4000 fpm.

3. Temperature Range: Minus 20 to plus 210 deg F.

D. Noninsulated-Duct Connectors: UL 181, Class 1, aluminum laminate and polyester film with latex adhesive supported by helically wound, spring-steel wire.

1. Pressure Rating: 10-inch wg positive and 1.0-inch wg negative.

2. Maximum Air Velocity: 4000 fpm.

3. Temperature Range: Minus 20 to plus 210 deg F.

E. Noninsulated-Duct Connectors: UL 181, Class 0, interlocking spiral of aluminum foil.

1. Pressure Rating: 8-inch wg positive or negative.

2. Maximum Air Velocity: 5000 fpm.

3. Temperature Range: Minus 100 to plus 435 deg F.

F. Insulated-Duct Connectors: UL 181, Class 1, 2-ply vinyl film supported by helically wound, spring-steel wire; fibrous-glass insulation; aluminized vapor barrier film.

1. Pressure Rating: 10-inch wg positive and 1.0-inch wg negative.

2. Maximum Air Velocity: 4000 fpm.

3. Temperature Range: Minus 10 to plus 160 deg F.

4. Insulation R-value: [Comply with ASHRAE/IESNA 90.1] <Insert value>.

2.10 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.

PART 3 - EXECUTION

3.1 APPLICATION AND INSTALLATION

A. Install duct accessories according to applicable details in SMACNA's "HVAC Duct

Construction Standards--Metal and Flexible" for metal ducts and in NAIMA AH116, "Fibrous

Glass Duct Construction Standards," for fibrous-glass ducts.

10090 AIR DUCT ACCESSORIES 233300-9

B. Provide duct accessories of materials suited to duct materials; use galvanized-steel accessories in galvanized-steel and fibrous-glass ducts, stainless-steel accessories in stainless-steel ducts, and aluminum accessories in aluminum ducts.

C. Install backdraft dampers on exhaust fans or exhaust ducts nearest to outside and where indicated.

D. Install volume dampers in ducts with liner; avoid damage to and erosion of duct liner.

E. Provide balancing dampers at points on supply, return, and exhaust systems where branches lead from larger ducts as required for air balancing. Install at a minimum of two duct widths from branch takeoff.

F. Provide test holes at fan inlets and outlets and elsewhere as indicated.

G. Install fire and smoke dampers, with fusible links, according to manufacturer's UL-approved written instructions.

H. Install duct silencers [independent of ducts with flexible duct connectors, lagged with loaded vinyl sheet on inlets and outlets] [rigidly to ducts].

I. Install duct access doors to allow for inspecting, adjusting, and maintaining accessories and terminal units as follows:

1. On both sides of duct coils.

2. Downstream from volume dampers, turning vanes, and equipment.

3. Adjacent to fire or smoke dampers, providing access to reset or reinstall fusible links.

4. To interior of ducts for cleaning; before and after each change in direction, at maximum

50-foot spacing.

5. On sides of ducts where adequate clearance is available.

J. Install the following sizes for duct-mounting, rectangular access doors:

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.

K. Install the following sizes for duct-mounting, round access doors:

1. One-Hand or Inspection Access: 8 inches in diameter.

2. Two-Hand Access: 10 inches in diameter.

3. Head and Hand Access: 12 inches in diameter.

L. Label access doors according to Division 23 Section "Mechanical Identification."

M. Install flexible connectors immediately adjacent to equipment in ducts associated with fans and motorized equipment supported by vibration isolators.

N. Connect terminal units to supply ducts with maximum 12-inch lengths of flexible duct. Do not use flexible ducts to change directions.

10090 AIR DUCT ACCESSORIES 233300-10

O. Connect diffusers or light troffer boots to low pressure ducts[ directly or] with maximum 60-inch lengths of flexible duct clamped or strapped in place.

P. Connect flexible ducts to metal ducts with [adhesive] [liquid adhesive plus tape] [draw bands]

[adhesive plus sheet metal screws].

Q. Install duct test holes where indicated and required for testing and balancing purposes.

3.2 ADJUSTING

A. Adjust duct accessories for proper settings.

B. Adjust fire and smoke dampers for proper action.

C. Final positioning of manual-volume dampers is specified in Division 23, Section 230593

"Testing, Adjusting, and Balancing."

END OF SECTION 233300