Minneapolis Public Schools



SECTION 23 33 00AIR DUCT ACCESSORIES - GENERALSUMMARYSection Includes: Include labor, materials, equipment, and accessories to furnish and install air duct accessories related to duct systems.SUBMITTALSShop 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.Shop Drawings - Sound Attenuators: Submit a portfolio showing size, capacity in cfm, static pressure loss, certified test data on dynamic insertion loss, self-noise power levels, and aerodynamic performance for reverse and forward flow test conditions for approval by Architect/Engineer.QUALITY ASSURANCERegulatory Requirements:State Building CodeLocal Codes and OrdinancesLocal Authority having jurisdictionManufacturer 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 3 years.Codes and Standards:Code Compliance: Comply with applicable portions of State Building Code.SMACNA Compliance: Comply with applicable portions of SMACNA, HVAC Duct Construction Standards, Metal and Flexible".UL Compliance: Construct, test, and label fire dampers in accordance with UL Standard 555 "Fire Dampers and Ceiling Dampers".NFPA Compliance: Comply with applicable provisions of NFPA 90A "Air Conditioning and Ventilating Systems", pertaining to installation of ductwork accessories. - PRODUCTSMANUFACTURERSAcceptable Manufacturers for Access Doors: Subject to compliance with requirements of the Contract Documents, acceptable manufacturers are as follows:Cesco ProductsAdvanced AirNailorAcceptable Manufacturers for Dampers: Subject to compliance with requirements of the Contract Documents, acceptable manufacturers are as follows:GreenheckCescoRuskinPennNailorAcceptable Manufacturers for Fire Dampers and Ceiling Radiation Dampers: Subject to compliance with requirements of the Contract Documents, acceptable manufacturers are as follows:GreenheckNailorPrefcoRuskinPottorffAcceptable Manufacturers for Smoke Dampers and Combination Fire/Smoke Dampers: Subject to compliance with requirements of the Contract Documents, acceptable manufacturers are as follows:GreenheckPrefcoRuskinPottorffAcceptable Manufacturers for Pressure Relief Doors: Subject to compliance with requirements of the Contract Documents, acceptable manufacturers are as follows:RuskinKeesAcceptable Manufacturers for Turning Vanes: Subject to compliance with requirements of the Contract Documents, acceptable manufacturers are as follows:Duro Dyne Corp.Hart & Cooley Mfg. Co.Sheet Metal ConnectorsAcceptable Manufacturers for Duct Hardware: Subject to compliance with requirements of the Contract Documents, acceptable manufacturers are as follows:VentfabricsYoung Regulator Co.Acceptable Manufacturers for Sound Attenuators: Subject to compliance with requirements of the Contract Documents, acceptable manufacturers are as follows:Industrial Acoustics CompanyAerosonicsCommercial AcousticsUnited McGillVibroAcousticsPriceAcceptable Manufacturers for Internal Duct Liner (Closed Cell Foam): Subject to compliance with requirements of the Contract Documents, acceptable manufacturers are as follows:Accessible Products Co.Illbruck, Inc.AP/ArmaflexAcceptable Manufacturers for Flexible Connections at Fans: Subject to compliance with requirements of the Contract Documents, acceptable manufacturers are as follows:Duro Dyne Corp.Flexaust (The) Co.Ventfabrics, Inc.ACCESS DOORSGeneral Requirements: Fabricate rigid and close-fitting 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 1-inch thick insulation fill incorporating piano hinge on one side and cam latches on opposite side.Provide access doors, compatible with pressure class of ductwork, as scheduled on Drawings. MPS requires access doors in locations such as, air flow station, larger dampers with damper linkage internal to the duct, louver housings, or HVAC industry recommended locations. Frame shall be fabricated from galvanized steel and incorporate mounting device (tabs) and gasketing for positive seal. Frames shall be selected from internally insulated, non-insulated, or externally insulated ductwork.Provide window type door at each fire or fire/smoke damper.Door Size:Access doors shall be 2 inches less than transverse duct dimension up to a maximum of 18 inches and shall be the same size in longitudinal dimension up to 24 inches maximum, but not less than 12 inches. Locations where full body access is required, access door size 24” X 24” are required. Access doors up to 16-inch square shall have (2) compression sash type latches and panels larger than 16 inch by 16 inch shall have (4) compression sash type latches.Access doors shall be 2 inches less than transverse duct dimension from a minimum of 26 inches to a maximum of 60 inches high and shall be 1/2 the size in longitudinal dimension from a minimum of 18 inches to a maximum of 24 inches.Access doors shall have a continuous hinge with (2) handle type compression latches up through 48 inches and (3) handle type compression latches above 48 inches. Handles shall be both inside and outside.DAMPERSGeneral Requirements: Fabricate of galvanized steel, minimum 16 gauge or 16-gauge aluminum, and provide with quadrants or adjusting rod and lock screw in accordance with SMACNA Damper Construction Guidelines.Balancing (Manual) Dampers: Fabricate multi-blade balancing type damper of opposed blade pattern with maximum blade sizes 8 inches by 48 inches. Assemble center and edge crimped blade in prime coated or galvanized channel frame with suitable hardware. Must comply with SMACNA standards.Quality of damper shall be such that there is no rattling, noise, or vibration.Damper shall contain exterior control arm (handle).Backdraft and Relief Dampers: Gravity type dampers. Fabricate multi-blade, 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 an adjustable counter weighted or counter balanced type damper. Spring assisted dampers have proven less reliable. Actuator controlled dampers. Dampers are to be provided with factory hardware suitable for mounting of MPS approved actuators. The design team is to select and list an appropriate damper control method. Combustion Air Dampers: Provide a normally closed, spring loaded, motorized combustion air damper, installed in the combustion air intake.Dampers in Moisture Carrying Ductwork: Splitter dampers, balancing dampers, backdraft, and relief dampers shall be Type 304 stainless steel, in moisture carrying ductwork.FIRE DAMPERSType: Fire dampers shall be of the folding multiple blade, spring loaded type with fusible link.Qualifications:Fire dampers shall meet the requirements of NFPA 90A and further shall be tested, rated and labeled in accordance the sixth edition of UL Standard 555. Fire 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 UnductedHorizontal Mount (Airflow Down)-Ducted and UnductedEach fire damper proposed shall be leakage Class II, rated to close against maximum design airflow at its installed location with a 10 percent safety factor and against 4-inch w.g. minimum pressure across the closed damper, at a minimum 2,000 fpm velocity, when tested to 350 degrees F.Blades: In ductwork of 1-square foot cross sectional area or less, or if damper closes through a dimension of 12 inches or less, blades shall be stacked outside of nominal dimension of duct. Other dampers may have blades stacked inside of nominal dimension of duct.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.Sleeves: Provide 14 gauge steel sleeves to enclose dampers with extension through fire barrier.Sleeves may be 16 gauge for ducts not exceeding 24 inches in height, nor 36 inches in width.Links: Set or select fusible links (thermal sensor) for 165 degrees F.Dampers which are part of a smoke control system shall have 350 degrees F fusible links (thermal sensor).Ceiling Dampers: Where ductwork passes through fire rated ceilings, provide a heat/shield ceiling radiation damper with coated non-asbestos fiberglass aluminum impregnated cloth riveted to blade, 1-piece roll formed 22 gauge frame, stainless steel positive closure negator spring and UL listed replaceable fusible link. Air Balance Model 229 and 229C for 2-hour ratings and 249 and 249C for 4-hour or less rated ceilings.Dampers in Moisture Carrying Ductwork: Fire dampers shall be Type 304 stainless steel, in moisture carrying ductwork.SMOKE DAMPERSType: 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.Qualifications:Smoke dampers shall meet the requirements of NFPA 90A and further shall be tested, rated and labeled in accordance the fourth edition of UL Standard 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 UnductedHorizontal Mount (Airflow Down)-Ducted and UnductedEach smoke damper proposed shall be leakage Class I, rated to close against maximum design airflow at its installed location with a 10 percent safety factor and against 4-in. w.g. minimum pressure across the closed damper, at a minimum 2,000 fpm velocity, when tested to 350 degrees F.Minimum Ratings: Smoke dampers shall be qualified to UL555S leakage Class I at an elevated temperature of 350 degrees F. Each smoke damper/actuator combination shall have demonstrated the ability to operate (open and close) under HVAC operating conditions, with pressures of at least 4-inch w.g.Sleeves: Provide minimum of 14 gauge galvanized steel sleeve with depth to allow mounting of the damper within the plane of the smoke barrier.Sleeves may be 16 gauge for ducts not exceeding 24 inches in height nor 36 inches in width.Operator: Smoke damper operator shall be a 120 volt, AC, motor, 2-position, power open, spring return, for fail-safe operation tested to 20,000 cycles at 350 degrees F.Provide end switch for damper position indication.Where dampers are sectionalized with multiple actuators, damper blades shall be linked to ensure simultaneous operation.Wiring: Dampers shall bear UL label. Wiring shall be as called for in Division 26 and indicated on Drawings.In addition to meeting requirements of the Electrical Code, all wiring, regardless of voltage, shall be fully enclosed within continuous raceways.Dampers in Moisture Carrying Ductwork: Smoke dampers shall be Type 304 stainless steel, in moisture carrying BINATION FIRE/SMOKE DAMPERSType: 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.Qualifications: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 UL Standard 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 UnductedHorizontal Mount (Airflow Down)-Ducted and UnductedEach fire/smoke damper proposed shall be leakage Class I, rated to close against maximum design airflow at its installed location with a 10 percent safety factor and against 4-inch w.g. minimum pressure across the closed damper, at a minimum 2,000 fpm velocity, when tested to 350 degrees F.Minimum Ratings: Combination fire/smoke dampers shall be qualified to UL555S leakage Class I at an elevated temperature of 350 degrees F. Dampers and actuators shall have demonstrated the ability to operate (open and close) under HVAC operating conditions, with pressures of at least 4-inch w.g.Fusible link (thermal sensor) shall be rated a 165 degrees, unless otherwise required.Dampers which are part of a smoke control system shall have 350 degrees F fusible links (thermal sensor).Where dampers are sectionalized with multiple actuators, (1) thermal sensor shall be used and damper blades shall be linked to ensure simultaneous operation.Sleeves: Provide minimum of 14 gauge galvanized steel sleeve. Mount damper per manufacturer’s UL approved installation instructions.Sleeves may be 16 gauge for ducts not exceeding 24 inches in height nor 36 inches in width.Operator: Combination fire/smoke damper operator shall be a 120 volt, AC, motor, 2-position, power open, spring return, for fail-safe operation tested to 20,000 cycles at 350 degrees F.Wiring: Dampers shall bear UL label. Wiring shall be as called for in Division 26 and indicated on Drawings.In addition to meeting requirements of the Electrical Code, all wiring, regardless of voltage, shall be fully enclosed within continuous raceways.Test Switch: Damper shall be equipped with a momentary contact switch which, when activated shall cycle damper closed for testing purposes.Dampers in Moisture Carrying Ductwork: Combination fire/smoke dampers shall be Type 304 stainless steel, in moisture carrying ductwork.DRAIN PANSDescription: Externally mounted drain pans shall be fabricated from stainless steel containing a 1-inch drain connection and sealed watertight by soldering or use of sealant for a depth of 3 inches.Vertical duct risers serving either outdoor air intake duct or relief air duct shall incorporate a 3” deep sloped water tight integral drain pan with a drain size connection 1” or larger. This shall be piped to the closest floor drain. Design professional to consider potential water and go far as to create a plan detail and a possible submittal process to ensure proper capture and containment od snow and/or condensation. PRESSURE RELIEF DOORSDescription: 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.The relief pressure damper shall be factory tested and set in an AMCA approved lab prior to shipping.Standard Construction:Frame: 12 gauge galvanized steel, Z-shape.Door: 12 gauge galvanized steel with piano hinge on bottom.Seal: Polyurethane foam around door perimeter.Pressure Relief Settings: Available for relief pressures from 3-inch to 8-inch w.g.Springs: Negator springs for door closure upon loss of over pressurization.Door Size: 18-inch by 18-inch; cut opening 18 5/8-inch by 18 5/8-inch to accommodate door.FLEXIBLE CONNECTIONS AT FANSGeneral Requirements: Construct flexible connections of neoprene-coated 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 1 inch of pressure, all taped connections shall be secured with bolted and screwed steel bands. Tape with adhesive coatings on 1 side can then be eliminated, but the tape with adhesive on both sides shall remain in order to ensure a leak-proof joint.Connections shall be air-tight 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, air-tight, acid-resistant; 6-inch wide material.DUCT DRAINSWeather 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.Caulk ductwork seams for a distance 10 feet from outside louver watertight at bottom of duct and 8 inches up side of duct with a duct sealer.Vertical Ductwork: Refer to Drawings for vertical ductwork connected to roof openings.TURNING VANESGeneral: Provide turning vanes constructed of 1 1/2-inch wide curved blades set at 3/4 inch on center, supported with bars perpendicular to blades set at 2 inches on center, and set into side strips suitable for mounting in ductwork.In ducts over 2 square feet in area, turning vanes shall be double (airfoil section).DUCT HARDWAREGeneral Requirements: Provide duct hardware, manufactured by one manufacturer for all items on project, for the following: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 12 inches. Provide extended quadrant locks and end extended bearing plates for externally insulated ductwork.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.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.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.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.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.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.Roof mounted HVAC equipment and duct systems: Duct systems which are large enough to present a security or safety hazard will require mounted safety service platform or burglar bar type device. Design documents shall designate duct locations to be protected. BELT DRIVESGeneral Requirements: V-belt 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.Rating: Fan belt and sheave package selections shall be based on 150 percent overload rating for units.Adjustment: Furnish variable pitch pulleys on motors of such size that fan speed shall be obtained at midpoint of pulley adjustment.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.FILTER GAUGESGeneral Requirements: Provide Dwyer, Magnehelic Series 2000, or Owner approved equal, filter gauges for the filters in the air handling unit system. Draft shall be in inches water gauge and each gauge connection shall have a shut-off.Prefilter gauge shall be Model 2001-AF with a range from 0 to 1-inch w.g. and 0.02-inch increments.Final filter gauge shall be Model 2003-AF with a range from 0 to 3-inch w.g. and 0.10-inch increments.SOUND ATTENUATORSMaterials and Construction:Casings - Rectangular: Outer casings of rectangular attenuators shall be made of 22 gauge galvanized steel in accordance with ASHRAE Guide recommended construction for high pressure rectangular ductwork. Seams shall be lock formed and mastic filled. Interior partitions of rectangular attenuators shall be not less than 26 gauge galvanized perforated steel.Casings - Tubular: Outer casings of tubular attenuators shall be made of galvanized steel in the following gauges:TYPE NS, NLTYPE CS, CL OUTSIDE DIAMETER METAL GAUGE OUTSIDE DIAMETER METAL GAUGE 12 TO 22 INCHES 22 20 TO 36 INCHES 22 24 TO 48 INCHES 18 38 TO 52 INCHES 18Encapsulated Filler: Filler material shall be of inorganic glass fiber of a proper density to obtain the specified acoustic performance and be packed under not less than 5 percent compression to eliminate voids due to vibration and settling. Material shall be inert, vermin, and moisture proof. Filler material shall be totally encapsulated and sealed with mylar or tedlar film of an approximate thickness of 1.5 mils. The encapsulated fill material shall be separated from the interior perforated baffles by means of a non-combustible, erosion resistant, factory installed, acoustic stand-off. It shall not be acceptable to omit the acoustic stand-off and try to compensate for its absence by means of corrugated bustion Rating: Combustion rating for the silencer acoustic fill shall be not less than the following when tested in accordance with ASTM E84, NFPA Standard 255 or UL 723: FLAMESPREAD CLASSIFICATION 25 SMOKE DEVELOPMENT RATING 15 FUEL CONTRIBUTION 20Acoustic Performance:Acoustic Tests and Ratings: Silencer ratings shall be determined in a duct-to-reverberant room test facility which provides for airflow in both directions through the test silencer in accordance with ASTM E477. Test set-up and procedure shall be such that effects due to end reflection, directivity, flanking transmission, standing waves, and test chamber sound absorption are eliminated. Acoustic ratings shall include Dynamic Insertion Loss (DIL) and Self-Noise (SN) power levels both for forward flow (air and noise in same direction) and reverse flow (air and noise in opposite directions) with airflow of at least 2,000 fpm entering face velocity. MINIMUM DYNAMIC INSERTION LOSS, DB AT 2,000 FPM MODEL NUMBER OCTAVE BAND FREQUENCIES 63 125 250 500 1000 2000 4000 8000 SUPPLY 3MS 4 7 12 19 23 23 18 11 5MS 6 10 18 30 42 34 23 14 7MS 10 14 24 36 48 44 31 18 RETURN 3MS 6 8 14 23 27 20 14 8 5MS 8 11 18 32 42 33 22 11 7MS 10 15 26 36 49 40 28 14 MAXIMUM SELF-NOISE POWER LEVELS, DB 10-12 WATTS AT 2,000 FPM MODEL NUMBER OCTAVE BAND FREQUENCIES 63 125 250 500 1000 2000 4000 8000 SUPPLY 3MS 63 54 52 50 47 48 47 44 5MS 63 54 52 50 47 48 47 44 7 MS 63 54 52 50 47 48 47 44 RETURN 3 MS 60 56 56 56 57 59 58 49 5 MS 60 56 56 56 57 59 58 49 7 MS 60 56 56 56 57 59 58 49Aerodynamic Performance:Air Flow Measurements: Static pressure loss of silencers shall not exceed those listed in the silencer schedule as the air flow indicates. Air flow measurements shall be made in accordance with ASTM E477 and applicable portions of ASME, AMCA, and ADC air flow test codes. Tests shall be reported on the identical units for which acoustic data is presented.INTERNAL DUCT LINER - CLOSED CELL FOAMGeneral:Exposed internal duct insulation shall not be used in any pressurized air duct systems.Exposed internal duct insulation is permissible when used in non-pressurized air transfer ducts for the purpose of sound transmission mitigation.Minimum Requirements: 0.27 BTU per inch per square foot per hour at 75-degree F mean temperature.Meet test procedure ATSM E84 guidelines.Meet minimum sound absorption coefficency rating of .48 at 500 Hertz frequency.Shall not support microbial growth.- EXECUTIONINSPECTIONGeneral Requirements: Examine areas and conditions under which ductwork accessories will be installed. Do not proceed with work until unsatisfactory conditions have been corrected in manner acceptable to installer.INSTALLATION OF DUCTWORK ACCESSORIESGeneral Requirements: Install ductwork accessories in accordance with manufacturer's installation instructions, with applicable portions of details of construction as shown in AMACNA Standards, and in accordance with recognized industry practices to ensure that products serve intended function.Access Doors: Install access doors at fan housings, ductwork, filter housings, automatic dampers, fire dampers, motorized dampers, face and bypass dampers, coils, and where required for proper maintenance and inspection of equipment, including "walk-thru" access.Doors to be installed with hinged side against air stream.Sheet metal nosing shall be applied to access panel and door edges, as well as adjacent duct opening edges.Fire Dampers: Provide fire dampers at locations shown, where ducts and outlets pass through fire rated components, and where required by authorities having jurisdiction. Fire dampers shall be complete with required perimeter mounting angles, sleeves, breakaway duct connections, corrosion resistant springs, bearings, bushings, and hinges.Balancing (Manual) Dampers: Provide manual dampers in each branch duct to facilitate balancing.Do not install branch damper in intake side of variable air volume boxes. Branch dampers shall be installed on low pressure (discharge) side of VAV boxes in multiple openings systems.Flexible Connections: Provide flexible connections immediately adjacent to equipment in ducts associated with fans and equipment that do not have internal vibration isolation.Control Dampers: Install control dampers as indicated and shown on Drawings. Control dampers shall be furnished by the Temperature Control Subcontractor.Provide all necessary blank offs, access doors, inspection doors, and transitions needed for a proper installation as recommended by damper manufacturers and for damper maintenance.All dampers shall have factory provided hardware for installation of field mounted actuators. Ex: Damper shaft extensions of ample length and design to allow for a proper actuator connection (regardless of damper provider).Dampers in air handler mixing box type applications, shall be parallel blade type. Dampers shall be installed in accordance with damper manufacturer installation instructions.Dampers shall have appropriately sized access doors. Install dampers square, level, and free from racking. Pressure Relief Door:The door shall be set to open at 3-inch w.g. static pressure. The door shall be installed to open outwardly, to relieve positive pressure, on the discharge side of the fan and to open inwardly, to relieve negative pressure, on the suction side of the fan.The door shall be installed vertically and level for proper operation.Provide relief doors, compatible with pressure class of ductwork, where over-pressurization is anticipated.Turning Vanes:Install turning vanes in square or rectangular (90) elbows in supply, return and exhaust air systems, and elsewhere as indicated.Medium and High Pressure Flex-Connections: For connections to medium and high pressure fans, install a 1/2-inch thick neoprene pad over fabric, and hold in place with additional metal straps.ACCEPTANCE TEST FOR SMOKE AND SMOKE/FIRE DAMPERSTest: All fire dampers, smoke dampers, fire/smoke dampers, and ceiling dampers shall be tested and reported, prior to building occupancy, to determine that they function in accordance with the requirements of this Standard. Acceptance test shall, as far as practical, simulate actual conditions, including operating dampers with designed system airflow to ensure that they are not held open by the air stream. Contractor shall bear all cost for testing and report.Test shall be performed in presence of Owner’s representative, commissioning agent and the authority having jurisdiction.Reports: Four (4) sets of reports shall be prepared of acceptance test results. Two (2) copies shall be submitted to the Architect/Engineer, one (1) copy to the authority having jurisdiction, and one copy to the commissioning agent. .Reports shall include an ID for each device, location, device type, actuator type, technician, date of test, and pass/fail test result.The following is a sample report.IDLocationSystem ServedTypeActuator Type23 33 00 Pass/Fail28 31 00 Pass/FailTechnicianDateNotesSOUND ATTENUATOR INSTALLATIONLocation: Install silencers equivalent of (3) diameters upstream and downstream of system components to maintain minimum pressure drop.Splitters: Where elbows precede silencers, splitters should be parallel to the plane of the elbow turn.Install silencer splitters vertically where possible. When splitters must be in horizontal position, provide reinforcement for units wider than 24 inches.Multiple Units: When (2) or more attenuators are used together, firmly join as recommended by manufacturer, having continuous nosing strip slipped over adjoining flanges to prevent leakage. Firmly support units in the duct system.General Requirements:When space limitation does not permit the above installation priorities, elbows, turns, and other directional materials must be provided with turning vanes.Install attenuator so interior partitions of attenuator are perpendicular to turning vanes.Install units with their own support systems. Units are unacceptable if supported wholly by ductwork.Provide duct transitional fittings to adopt attenuators to duct connections.SOUND ATTENUATOR SCHEDULERefer to Drawings for schedules.INTERNAL DUCT INSULATION APPLICATIONGeneral Requirements:All duct liner sections shall be tightly butted together so that there are no interruptions or gaps. Adhere liner to metal with full coverage of adhesive meeting ASTM C916. Secure duct liner with mechanical fasteners in accordance with SMACNA and NAIMA Standards. Install metal nosing on all leading edges of liner when velocity exceeds 4,000 fpm. Super seal will be used to coat all circumferential joints, exposed edges and minor surface damage after the liner is in place. Super seal HV will be used to fill minor gaps and indentations.Duct sizes shown on Drawings shall be increased as necessary to accommodate duct liner thickness.Preparation: Apply thermal and acoustical duct liner over clean, dry surfaces. Consult Ductwork Mechanical Contractor for assurances that duct has been tested and approved before duct liner application.Schedule: Provide internal insulation on the following ductwork systems as indicated:Type of Duct SystemType of InsulationThicknessDensityTransfer Ductwork and Return Diffuser Boots: Internally insulate from inlet to outlet.Closed cell foam duct liner.1"3 poundHVAC Return Air Ductwork: Where indicated on the Drawings provide liner inside rectangular ductwork and round ductwork.Closed cell foam duct liner.1"3 poundExhaust Air Ductwork: Ductwork beyond drip pans or exhaust/relief louver plenums shall be internally lined for 15 feet from drip pans or exhaust/relief louver plenums.Closed cell foam duct liner.1"3 poundInternal Duct Liner Application:General: All portions of duct designated to receive duct liner shall be completely covered with liner.Adhesives: Duct liner shall be adhered to sheet metal with 90 percent coverage of fire resistant adhesive and all exposed leading edges and all transverse joints coated with adhesive.Use adhesives recommended by manufactures that meets "Adhesive and Sealant Council Standards for Adhesives for Duct Liner: ASC-A-7001C-1972".Mechanical Fasteners: Liner shall be secured to duct using mechanical fasteners which will slightly depress insulation to ensure insulation is firmly held in place.Fasteners shall be installed within 3 inches of both transverse and longitudinal seams, and spaced 12 inches on center.Mechanical Fastener shall conform to "Mechanical Fastener Standard MF-1-1971".In the use of an elastomeric foam liner such as "Armstrong AP Armafex SA Duct Liner" which is a self-adhering product, mechanical fasteners may be omitted until duct velocity reaches 4,000 feet per minute.FIELD QUALITY CONTROLGeneral Requirements: Operate installed ductwork accessories to demonstrate compliance with requirements. Test for air leakage while system is operating. Repair or replace faulty accessories, as required to obtain proper operation and leakproof performance.ADJUSTING AND CLEANINGAdjusting: Adjust ductwork accessories for proper settings, install fusible links in fire dampers and adjust for proper action.Label access doors in accordance with Section 23 05 53, Identification for HVAC Piping and Equipment.Final positioning of manual dampers is specified in Section 23 05 93, Testing, Adjusting, and Balancing for HVAC.Cleaning: Clean factory-finished surfaces. Repair any marred or scratched surfaces with manufacturer's touch-up paint.EXTRA STOCKGeneral Requirements: Furnish extra fusible links to Owner; (1) link for every (10) installed of each temperature range; obtain receipt.END OF SECTION 23 33 00 ................
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