SECTION 15891 DUCT ACCESSORIES
PART 1 - GENERAL
1.1 SUMMARY
A. This section includes:
1. Volume dampers.
2. Motorized control dampers & Actuators.
3. Turning vanes.
4. Fire Dampers.
5. Duct-mounting access doors.
6. Flexible connectors.
7. Duct accessory hardware.
1.2 SUBMITTALS
A. Product Data: For the following:
1. Motorized control dampers and damper motors.
1.3 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."
1.4 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.
PART 2 - PRODUCTS
2.1 GENERAL
A. Provide accessories suitable for environment in which they are being installed. Match duct material where applicable, i.e., for stainless steel ductwork, use stainless steel duct accessories.
2.2 MANUFACTURERS
A. In other Part 2 articles where titles below introduce lists, the following requirements apply to product selection:
1. Manufacturers: Subject to compliance with requirements, provide products by one of the manufacturers specified.
2.3 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 coating designation; ducts shall have mill-phosphatized finish for surfaces exposed to view.
C. Stainless Steel: ASTM A 480/A 480M.
D. Aluminum Sheets: ASTM B 209, alloy 3003, temper H14; with mill finish for concealed ducts and standard, 1-side bright finish for exposed ducts.
E. Extruded Aluminum: ASTM B 221, alloy 6063, temper T6.
F. Reinforcement Shapes and Plates: Galvanized-steel reinforcement where installed on galvanized sheet metal ducts; compatible materials for aluminum and stainless-steel ducts.
G. 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.
2.4 VOLUME DAMPERS
A. Manufacturers:
1. Air Balance, Inc.
2. American Warming and Ventilating.
3. McGill AirFlow Corporation.
4. METALAIRE, Inc.
5. Ruskin Company.
6. Vent Products Company, Inc.
B. 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.
C. 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. Aluminum Frames: Hat-shaped, 0.10-inch- thick, aluminum sheet channels; frames with flanges where indicated for attaching to walls; and flangeless frames where indicated for installing in ducts.
4. Roll-Formed Aluminum Blades: 0.10-inch- thick aluminum sheet.
5. Extruded-Aluminum Blades: 0.050-inch- thick extruded aluminum.
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.
2.5 MOTORIZED CONTROL DAMPERS – PROVIDED AS STAND ALONE NOT PART OF EQUIPMENT PACKAGE.
A. Manufacturers: Subject to “Buy American” Act compliance
1. TAMCO Series 9000 ECT (Insulated w/ thermally broken frame) & Series 1000 (Uninsulated).
2. Arrow Series AFDTI-25LT (Insulated w/ thermally broken frame) & Series ADF-20 (Unsulated)
B. Insulated dampers shall be as follows:
1. Extruded aluminum damper frame shall not be less than .080" thickness. Damper frame to be 4" deep and shall be insulated with polystyrene on three sides if “Installed to Duct” type and on four sides if “Flanged to Duct” type.
2. Blades to be extruded aluminum, internally insulated with non CFC, 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.
3. Blade gaskets shall be Flexible silicon. Frame seals shall be of extruded flexible silicon. Gaskets to be secured in an integral slot within aluminum extrusions.
4. Bearings to be comprised of a clean inner bearing fixed to a 7/16" aluminum hexagon blade pin rotating within a polycarbonate outer bearing inserted in frame.
5. Linkage hardware shall be installed in frame side and be constructed of aluminum and corrosion resistant zinc and nickel plated steel, complete with cup point trunnion screws for slip proof grip.
6. Dampers to be designed for operation in temperatures ranging between 40ºF and 212ºF.
7. Damper shall be available with either opposed blade action for modulating control or parallel blade action for basic open/close control. See damper schedule for Action specified.
8. Air leakage through a 48" x 48" damper shall not exceed 4.12 cfm/sq. ft. against 4" w.g. differential static pressure @ standard air leakage data to be certified under the AMCA certified ratings program.
9. Leakage shall not exceed 6.7 cfm/sq. ft. against 4" differential static pressure @ 40ºF.
10. Pressure drop of a fully open 48" x 48" damper shall not exceed .03" w.g. at 1,000 fpm.
11. Dampers shall be made to size required without blanking off free area.
12. Dampers shall be “Flanged to Duct” configuration.
13. Installation of dampers shall be in accordance with manufacturer’s installation guidelines.
C. Uninsulated dampers to be as follows:
1. Extruded aluminum damper frame shall not be less than .080” thick. Damper frame to be 4” deep.
2. Blades to be of extruded aluminum profiles.
3. Blade gaskets shall be of extruded EPDM. Frame seals shall be of extruded TPE. Gaskets to be secured in an integral slot within aluminum extrusions.
4. Bearings to be comprised of a celcon inner bearing fixed to a 7/16" stainless steel hexagon blade pin rotating within a polycarbonate outer bearing inserted in frame.
5. Linkage hardware shall be installed in frame side and be constructed of stainless steel, complete with cup point trunnion screws for slip proof grip.
6. Dampers to be designed for operation in temperatures ranging between -40ºF (- 40ºC) and 212ºF (100ºC).
7. Dampers shall be available with either opposed blade action for modulating control or parallel blade action for basic open/closed control.
8. Air leakage through a 48" x 48" damper shall not exceed 10.3 CFM/sq. ft. against 4" W.G. differential static pressure @ standard air. Standard air leakage data to be certified under the AMCA certified ratings program.
9. Pressure drop of a fully open 48" x 48" damper shall not exceed .02" W.G. at 1000 FPM.
10. Dampers shall be made to size required without blanking off free area.
11. Dampers shall be “Flanged to Duct” configuration.
12. Installation of dampers shall be in accordance with manufacturer’s installation guidelines.
D. Damper Motors / Actuators
1. Provide damper motors/actuators of the electronic type sized to operate their respective dampers with sufficient reserve power to provide smooth modulation action.
2. Provide damper operators with spring return, which shall return all dampers to their normally open or normally closed positions upon failure of controlling signal. Dampers shall be 120V type with end switches for proof of open and/close.
3. In corrosive areas, provide damper motor enclosure suitable for use in corrosive atmosphere. In Class 1, Division 1 & 2 areas, provide damper motors with enclosures which are both corrosion resistant and explosion proof.
4. Manufacturers: Subject to “Buy American” Act compliance
a. Belimo Aircontrols, Inc.
b. Honeywell
c. Johnson Controls
2.6 FIRE DAMPERS
A. Manufacturers:
1. Air Balance, Inc.
2. CESCO Products.
3. Greenheck.
4. METALAIRE, Inc.
5. Ruskin Company.
6. Vent Products Company, Inc.
B. Fire dampers shall be labeled according to UL 555.
C. Fire Rating: 3 hours.
D. Frame: Curtain type with blades outside airstream fabricated with roll-formed, 0.034- inch- thick galvanized steel; with mitered and interlocking corners.
E. Mounting Sleeve: Factory- or field-installed, galvanized sheet steel.
1. Minimum Thickness: 0.138 inch thick 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.
F. Mounting Orientation: Vertical or horizontal as indicated.
G. 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.
H. Fusible Links: Replaceable, 165 deg F rated.
2.7 TURNING VANES
A. Fabricate to comply with SMACNA's "HVAC Duct Construction Standards--Metal and Flexible" for vanes and vane runners. Vane runners shall automatically align vanes.
B. Manufactured Turning Vanes: Fabricate 1-1/2-inch- wide, double-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.
1. Manufacturers:
a. Ductmate Industries, Inc.
b. Duro Dyne Corp.
c. METALAIRE, Inc.
d. Ward Industries, Inc.
2.8 DUCT-MOUNTING ACCESS DOORS
A. General Description: Fabricate doors airtight and suitable for duct pressure class.
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. Manufacturers:
a. American Warming and Ventilating.
b. CESCO Products.
c. Ductmate Industries, Inc.
d. Greenheck.
e. McGill AirFlow Corporation.
f. Ventfabrics, Inc.
2. Frame: Galvanized sheet steel, with bend-over tabs and foam gaskets.
3. 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.
2.9 FLEXIBLE CONNECTORS
A. Manufacturers:
1. Ductmate Industries, Inc.
2. Duro Dyne Corp.
3. Ventfabrics, Inc.
B. General Description: Flame-retardant or noncombustible fabrics, coatings, and adhesives complying with UL 181, Class 1.
C. 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.
D. 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.
2.10 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.
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 control dampers (powered 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 for all diffuser and equipment connections unless noted otherwise.
F. Provide additional balancing dampers that are required to achieve a balanced system but not shown on the drawings. Install balancing dampers a minimum of two duct widths from branch takeoff.
G. Provide test holes at fan inlets and outlets and elsewhere as indicated.
H. Air blender installation shall be in accordance with the manufacturer’s written installation instructions and SMACNA plenum construction guidelines. If necessary, provide reinforcement in plenum where the mixing device is installed to eliminate excess vibration or deflection of blank off plenum.
I. Install fire dampers, with fusible links, according to manufacturer's UL-approved written instructions.
J. 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.
K. Install flexible connectors immediately adjacent to equipment in ducts associated with fans and motorized equipment supported by vibration isolators.
L. For fans developing static pressures of 5-inch wg and higher, cover flexible connectors with loaded vinyl sheet held in place with metal straps.
M. 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 dampers for proper action.
C. Final positioning of manual-volume dampers is specified in Division 15 Section "Testing, Adjusting, and Balancing."
END OF SECTION
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