MPS Master
SECTION 23 33 00
AIR DUCT ACCESSORIES
PART 1 - GENERAL
1.01 SUMMARY
A.Section Includes: Include labor, materials, equipment, and accessories to furnish and install air duct accessories related to duct systems.
1.02 SUBMITTALS
A.Shop Drawings: Submit a portfolio showing access doors, fire dampers and balancing dampers, and a schedule listing size and location for each damper and door for approval by Architect/Engineer.
B.Shop Drawings - Sound Attenuators: Submit a portfolio showing size, capacity in cfm, static pressure loss, certified test data on dynamic insertion loss, selfnoise power levels, and aerodynamic performance for reverse and forward flow test conditions for approval by Architect/Engineer.
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1.03 QUALITY ASSURANCE
A.Regulatory Requirements:
1.StateBuilding Code
2.Local Codes and Ordinances
3.Local Authority having jurisdiction
B.Manufacturer Qualifications: Firms regularly engaged in manufacture of ductwork accessories, of types and sizes required, whose products have been in satisfactory use in similar service for not less than 3years.
C.Codes and Standards:
1.Code Compliance: Comply with applicable portions of State Building Code.
2.SMACNA Compliance: Comply with applicable portions of SMACNA, HVAC Duct Construction Standards, Metal and Flexible".
3.UL Compliance: Construct, test, and label fire dampers in accordance with UL Standard 555 "Fire Dampers and Ceiling Dampers".
4.NFPA Compliance: Comply with applicable provisions of NFPA 90A "Air Conditioning and Ventilating Systems", pertaining to installation of ductwork accessories.
PART 2 - PRODUCTS
2.01 MANUFACTURERS
A.Acceptable Manufacturers for Access Doors: Subject to compliance with requirements of the Contract Documents, acceptable manufacturers are as follows:
1.Cesco Products
2.Advanced Air
3.Nailor
B.Acceptable Manufacturers for Dampers: Subject to compliance with requirements of the Contract Documents, acceptable manufacturers are as follows:
1.Greenheck
2.Cesco
3.Ruskin
4.Penn
5.Nailor
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C.Acceptable Manufacturers for Fire Dampers and Ceiling Radiation Dampers: Subject to compliance with requirements of the Contract Documents, acceptable manufacturers are as follows:
1.Greenheck
2.Nailor
3.Prefco
4.Ruskin
5.Pottorff
D.Acceptable Manufacturers for Smoke Dampers and Combination Fire/Smoke Dampers: Subject to compliance with requirements of the Contract Documents, acceptable manufacturers are as follows:
1.Greenheck
2.Prefco
3.Ruskin
4.Pottorff
E.Acceptable Manufacturers for Pressure Relief Doors: Subject to compliance with requirements of the Contract Documents, acceptable manufacturers are as follows:
1.Ruskin
2.Kees
F.Acceptable Manufacturers for Turning Vanes: Subject to compliance with requirements of the Contract Documents, acceptable manufacturers are as follows:
1.Duro Dyne Corp.
2.Hart & Cooley Mfg. Co.
4.Sheet Metal Connectors
G.Acceptable Manufacturers for Duct Hardware: Subject to compliance with requirements of the Contract Documents, acceptable manufacturers are as follows:
1.Ventfabrics
2.Young Regulator Co.
H.Acceptable Manufacturers for Sound Attenuators: Subject to compliance with requirements of the Contract Documents, acceptable manufacturers are as follows:
1.Industrial Acoustics Company
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SECTION 23 33 00
2.Aerosonics
3.Commercial Acoustics
4.United McGill
5.VibroAcoustics
6.Price
I.Acceptable Manufacturers for Internal Duct Liner (Closed Cell Foam): Subject to compliance with requirements of the Contract Documents, acceptable manufacturers are as follows:
1.Accessible Products Co.
2.Illbruck, Inc.
3.AP/Armaflex
J.Acceptable Manufacturers for Flexible Connections at Fans: Subject to compliance with requirements of the Contract Documents, acceptable manufacturers are as follows:
1.Duro Dyne Corp.
2.Flexaust (The) Co.
3.Ventfabrics, Inc.
2.02 ACCESS DOORS
A.General Requirements: Fabricate rigid and closefitting access doors of galvanized steel with sealing gaskets and quick fastening locking devices. For insulated ductwork, the access door shall be double walled, galvanized steel with 1inch thick insulation fill incorporating piano hinge on one side and cam latches on opposite side.
1.Provide access doors, compatible with pressure class of ductwork, as scheduled on Drawings.
2.Frame shall be fabricated from galvanized steel and incorporate mounting device (tabs) and gasketing for positive seal. Frames shall be selected from internally insulated, noninsulated, or externally insulated ductwork.
3.Provide window type door at each fire or fire/smoke damper.
B.Door Size:
1.Access doors shall be 2inches less than transverse duct dimension up to a maximum of 18inches and shall be the same size in longitudinal dimension up to 18inches maximum, but not less than 12inches.
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a.Access doors up to 16inch square shall have (2) compression sash type latches and panels larger than 16inch by 16inch shall have (4) compression sash type latches.
2.Access doors shall be 2inches less than transverse duct dimension from a minimum of 26inches to a maximum of 60inches high and shall be 1/2 the size in longitudinal dimension from a minimum of 18inches to a maximum of 24inches.
a.Access doors shall have a continuous hinge with (2) handle type compression latches up through 48inches and (3) handle type compression latches above 48inches. Handles shall be both inside and outside.
2.03 DAMPERS
A.General Requirements: Fabricate of galvanized steel, minimum 16gauge or 16-gauge aluminum, and provide with quadrants or adjusting rod and lock screw in accordance with SMACNA Damper Construction Guidelines.
B.Balancing (Manual) Dampers: Fabricate multiblade balancing type damper of opposed blade pattern with maximum blade sizes 8inches by 48inches. Assemble center and edge crimped blade in prime coated or galvanized channel frame with suitable hardware. Must comply with SMACNA standards.
1.Quality of damper shall be such that there is no rattling, noise, or vibration.
2.Damper shall contain exterior control arm (handle).
C.Backdraft and Relief Dampers: Fabricate multiblade, parallel action, gravity balanced dampers with linked blades, brass bearings, and felt or flexible vinyl sealing edges for noiseless operation. Dampers shall have an adjustment device to permit setting for varying differential static pressure conditions. Due to the pressure range requirements MPS preference is a counter balanced type damper for all air handler or general space back draft and/or relief damper horizontal installations. Air handler intake dampers shall be actuator controlled.
1.Fabricate frames from steel or aluminum and blades of aluminum.
D.Combustion Air Dampers: Provide a normally closed, spring loaded, motorized combustion air damper, installed in the combustion air intake.
E.Dampers in Moisture Carrying Ductwork: Splitter dampers, balancing dampers, backdraft, and relief dampers shall be Type 304 stainless steel, in moisture carrying ductwork.
2.04 FIRE DAMPERS
A.Type: Fire dampers shall be of the folding multiple blade, spring loaded type with fusible link.
B.Qualifications:
1.Fire dampers shall meet the requirements of NFPA 90A and further shall be tested, rated and labeled in accordance the sixth edition of ULStandard 555. Fire dampers shall be Dynamic Rated for closure against airflow in the following (6) installation configurations:
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Vertical Mount (Horizontal Airflow) / - / Ducted and UnductedHorizontal Mount (Airflow Up) / - / Ducted and Unducted
Horizontal Mount (Airflow Down) / - / Ducted and Unducted
2.Each fire damper proposed shall be leakage ClassII, rated to close against maximum design airflow at its installed location with a 10percent safety factor and against 4inchw.g. minimum pressure across the closed damper, at a minimum 2,000 fpm velocity, when tested to 350degreesF.
C.Blades: In ductwork of 1square foot cross sectional area or less, or if damper closes through a dimension of 12inches or less, blades shall be stacked outside of nominal dimension of duct. Other dampers may have blades stacked inside of nominal dimension of duct.
1.Where duct sizes exceed maximum size of curtain style dampers, provide multiple bladed dampers, with a common thermal sensor and damper blades linked to ensure simultaneous operation.
D.Sleeves: Provide 14 gauge steel sleeves to enclose dampers with extension through fire barrier.
1.Sleeves may be 16gauge for ducts not exceeding 24inches in height, nor 36inches in width.
E.Links: Set or select fusible links (thermal sensor) for 165degreesF.
1.Dampers which are part of a smoke control system shall have 350degreesF fusible links (thermal sensor).
F.Ceiling Dampers: Where ductwork passes through fire rated ceilings, provide a heat/shield ceiling radiation damper with coated nonasbestos fiberglass aluminum impregnated cloth riveted to blade, 1piece roll formed 22gauge frame, stainless steel positive closure negator spring and UL listed replaceable fusible link. Air Balance Model229 and 229C for 2hour ratings and 249 and 249C for 4hour or less rated ceilings.
G.Dampers in Moisture Carrying Ductwork: Fire dampers shall be Type 304 stainless steel, in moisture carrying ductwork.
2.05 SMOKE DAMPERS
A.Type: Smoke dampers shall be parallel or opposed blade type with sleeve and factory mounted electric motor operators. Smoke dampers shall close automatically upon signal from smoke detector.
B.Qualifications:
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1.Smoke dampers shall meet the requirements of NFPA 90A and further shall be tested, rated and labeled in accordance the fourth edition of ULStandard 555S. Smoke dampers shall be Dynamic Rated for closure against airflow in the following (6) installation configurations:
Vertical Mount (Horizontal Airflow) / - / Ducted and UnductedHorizontal Mount (Airflow Up) / - / Ducted and Unducted
Horizontal Mount (Airflow Down) / - / Ducted and Unducted
2.Each smoke damper proposed shall be leakage Class I, rated to close against maximum design airflow at its installed location with a 10percent safety factor and against 4in.w.g. minimum pressure across the closed damper, at a minimum 2,000 fpm velocity, when tested to 350degreesF.
C.Minimum Ratings: Smoke dampers shall be qualified to UL555S leakage ClassI at an elevated temperature of 350degreesF. Each smoke damper/actuator combination shall have demonstrated the ability to operate (open and close) under HVAC operating conditions, with pressures of at least 4inch w.g.
D.Sleeves: Provide minimum of 14 gauge galvanized steel sleeve with depth to allow mounting of the damper within the plane of the smoke barrier.
1.Sleeves may be 16gauge for ducts not exceeding 24inches in height nor 36inches in width.
E.Operator: Smoke damper operator shall be a 120volt, AC, motor, 2position, power open, spring return, for failsafe operation tested to 20,000 cycles at 350degreesF.
1.Provide end switch for damper position indication.
2.Where dampers are sectionalized with multiple actuators, damper blades shall be linked to ensure simultaneous operation.
F.Wiring: Dampers shall bear UL label. Wiring shall be as called for in Division26 and indicated on Drawings.
1.In addition to meeting requirements of the Electrical Code, all wiring, regardless of voltage, shall be fully enclosed within continuous raceways.
G.Dampers in Moisture Carrying Ductwork: Smoke dampers shall be Type 304 stainless steel, in moisture carrying ductwork.
2.06 COMBINATION FIRE/SMOKE DAMPERS
A.Type: Combination fire/smoke dampers shall be parallel or opposed blade type with sleeve and factory mounted electric motor operators. Dampers shall close automatically upon signal from smoke detector, or by actuation of a fusible link.
B.Qualifications:
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1.Combination fire/smoke dampers shall meet the requirements of NFPA 90A and further shall be tested, rated and labeled in accordance the 6th Edition of UL Standard 555 and the 4th Edition of ULStandard 555S. Fire/smoke dampers shall be Dynamic Rated for closure against airflow in the following (6) installation configurations:
Vertical Mount (Horizontal Airflow) / - / Ducted and UnductedHorizontal Mount (Airflow Up) / - / Ducted and Unducted
Horizontal Mount (Airflow Down) / - / Ducted and Unducted
2.Each fire/smoke damper proposed shall be leakage Class I, rated to close against maximum design airflow at its installed location with a 10percent safety factor and against 4inchw.g. minimum pressure across the closed damper, at a minimum 2,000 fpm velocity, when tested to 350degreesF.
C.Minimum Ratings: Combination fire/smoke dampers shall be qualified to UL555S leakage ClassI at an elevated temperature of 350degreesF. Dampers and actuators shall have demonstrated the ability to operate (open and close) under HVAC operating conditions, with pressures of at least 4inch w.g.
1.Fusible link (thermal sensor) shall be rated a 165degrees, unless otherwise required.
2.Dampers which are part of a smoke control system shall have 350degreesFfusible links (thermal sensor).
3.Where dampers are sectionalized with multiple actuators, (1)thermal sensor shall be used and damper blades shall be linked to ensure simultaneous operation.
D.Sleeves: Provide minimum of 14 gauge galvanized steel sleeve. Mount damper per manufacturer’s UL approved installation instructions.
1.Sleeves may be 16 gauge for ducts not exceeding 24inches in height nor 36inches in width.
E.Operator: Combination fire/smoke damper operator shall be a 120volt, AC, motor, 2position, power open, spring return, for failsafe operation tested to 20,000 cycles at 350degreesF.
F.Wiring: Dampers shall bear UL label. Wiring shall be as called for in Division26 and indicated on Drawings.
1.In addition to meeting requirements of the Electrical Code, all wiring, regardless of voltage, shall be fully enclosed within continuous raceways.
G.Test Switch: Damper shall be equipped with a momentary contact switch which, when activated shall cycle damper closed for testing purposes.
H.Dampers in Moisture Carrying Ductwork: Combination fire/smoke dampers shall be Type304 stainless steel, in moisture carrying ductwork.
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2.07 DRAIN PANS
A.Description: Externally mounted drain pans shall be fabricated from stainless steel containing a 1inch drain connection and sealed watertight by soldering or use of sealant for a depth of 3inches.
2.08 PRESSURE RELIEF DOORS
A.Description: The PRD18 pressure relief door shall be designed to relieve pressure and prevent structural damage to ductwork and/or plenums in the event of a damper closing while the fan is still running.
1.The relief pressure damper shall be factory tested and set in an AMCA approved lab prior to shipping.
B.Standard Construction:
1.Frame: 12 gauge galvanized steel, Z-shape.
2.Door: 12 gauge galvanized steel with piano hinge on bottom.
3.Seal: Polyurethane foam around door perimeter.
4.Pressure Relief Settings: Available for relief pressures from 3inch to 8inch w.g.
5.Springs: Negator springs for door closure upon loss of over pressurization.
6.Door Size: 18inch by 18inch; cut opening 185/8inch by 185/8inch to accommodate door.
2.09 FLEXIBLE CONNECTIONS AT FANS
A.General Requirements: Construct flexible connections of neoprenecoated flameproof fabric crimped into duct flanges for attachment to duct and equipment. Make airtight joint. Provide adequate joint flexibility to allow for thermal, axial, transverse, and torsional movement, and capable of absorbing vibrations of connected equipment. If pressure on discharge of fans exceeds 1inch of pressure, all taped connections shall be secured with bolted and screwed steel bands. Tape with adhesive coatings on 1side can then be eliminated, but the tape with adhesive on both sides shall remain in order to ensure a leakproof joint.
1.Connections shall be airtight and all angles, bolts, clips, tape or other fasteners shall be furnished by this Contractor. All material shall be equal to Ventglas, 30 ox/yd. double coated with neoprene, waterproof, airtight, acidresistant; 6inch wide material.
2.10 DUCT DRAINS
A.Weather Louvers: Arrange ductwork connected to weather louvers in outside walls as shown on Drawings with connection to louver made to ensure that moisture collecting in duct will drain to floor drain as shown on Drawings.
1.Caulk ductwork seams for a distance 10feet from outside louver watertight at bottom of duct and 8inches up side of duct with a duct sealer.
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B.Vertical Ductwork: Refer to Drawings for vertical ductwork connected to roof openings.
2.11 TURNING VANES
A.General: Provide turning vanes constructed of 11/2inch wide curved blades set at 3/4inch on center, supported with bars perpendicular to blades set at 2inches on center, and set into side strips suitable for mounting in ductwork.
1.In ducts over 2square feet in area, turning vanes shall be double (airfoil section).
2.12 DUCT HARDWARE
A.General Requirements: Provide duct hardware, manufactured by one manufacturer for all items on project, for the following:
1.Quadrant Locks: Provide for each damper, quadrant lock device on (1)end of shaft; and end bearing plates on other end for damper lengths over 12inches. Provide extended quadrant locks and end extended bearing plates for externally insulated ductwork.
a.Where dampers occur in concealed or confined spaces, provide Young No.301 and 315 concealed damper regulators and operator rods. Provide Young No.927 or 1200 right angle gear assemblies and operator rods with connections where required.
b.Where dampers are inaccessible due to height above a low ceiling or distance from a catwalk or accessible location provide couplers, adapters and rod extensions to allow for balancing and adjustments.
2.Zinc or Galvanized Steel: All duct hardware, including screws, duct hanger rod, damper quadrant handles, tie rods and connectors, trapeze supports, damper shafts, companion rings, spiral duct hangers, damper blades, etc., shall be either zinc or galvanized steel.
3.Flexible Duct Clamps: Flexible duct clamps may be either stainless steel with worm gear tightening device or nylon straps, provided proper tightening tool is used in their application.
4.Gasket Material: Gasketing materials (access doors, etc.) shall be impervious to gas, oil, and water, and resistant to fire. Materials shall be thick enough to form positive seals with zero tolerance for air leakage.
5.Adhesive Material: Adhesives shall be high strength, quick setting, and water based; when dry shall be waterproof and grease and oil resistant when used in duct liner applications. Material shall not contribute to flame spread or smoke development during course of fire.
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2.13 BELT DRIVES
A.General Requirements: Vbelt drives and pulleys shall be Browning Emerson, Gates Rubber Company, or Owner approved equal. Pulleys shall be of cast iron construction, stock size with renewable bushings, balanced for static and dynamic accuracy.
B.Rating: Fan belt and sheave package selections shall be based on 150percent overload rating for units.
C.Adjustment: Furnish variable pitch pulleys on motors of such size that fan speed shall be obtained at midpoint of pulley adjustment.
D.Guarantee: Belt and sheave packages shall be installed and tensioned in accordance with fan manufacturer’s recommendations. The installing contractor is to maintain the belt and sheave package during the warranty period. Documentation shall be reported as listed in Section 23 00 00, Appendix A.