UFGS_23_35_19.00_20_Industrial_Ventilation.pdf

SECTION 23 35 19.00 20 Page 1

SECTION 23 35 19.00 20

INDUSTRIAL VENTILATION AND EXHAUST

02/10

PART 1 GENERAL

1.1 REFERENCES

The publications listed below form a part of this specification to the extent referenced. The publications are referred to within the text by the basic designation only.

AIR MOVEMENT AND CONTROL ASSOCIATION INTERNATIONAL (AMCA)

AMCA 201 (2002; R 2011) Fans and Systems

AMCA 210 (2016) Laboratory Methods of Testing Fans for Aerodynamic Performance Rating

AMCA 211 (2013; Rev 2017) Certified Ratings Program Product Rating Manual for Fan Air Performance

AMCA 300 (2014) Reverberant Room Method for Sound

Testing of Fans

AMCA 301 (2014) Methods for Calculating Fan Sound Ratings from Laboratory Test Data

AMCA 500-D (2012) Laboratory Methods of Testing

Dampers for Rating

AMCA 99 (2016) Standards Handbook

AMCA 99-0401 (1986) Classifications for Spark Resistant Construction

AMCA CRP (Online) Directory of Products Licensed

Under the AMCA International Certified Ratings Program

AIR-CONDITIONING, HEATING AND REFRIGERATION INSTITUTE (AHRI)

AHRI 1060 I-P (2014) Performance Rating of Air-to-Air

Heat Exchangers for Energy Recovery Ventilation Heat Equipment

AMERICAN BEARING MANUFACTURERS ASSOCIATION (ABMA)

ABMA 11 (2014) Load Ratings and Fatigue Life for

Roller Bearings

ABMA 9 (2015) Load Ratings and Fatigue Life for Ball Bearings

AMERICAN CONFERENCE OF GOVERNMENTAL INDUSTRIAL HYGIENISTS (ACGIH)

ACGIH-2092S (2004) Industrial Ventilation: A Manual

SECTION 23 35 19.00 20 Page 2 of Recommended Practice

AMERICAN INSTITUTE OF STEEL CONSTRUCTION (AISC)

AISC 360 (2016) Specification for Structural Steel Buildings

AMERICAN WELDING SOCIETY (AWS)

AWS D1.1/D1.1M (2015; Errata 1 2015; Errata 2 2016)

Structural Welding Code - Steel

AWS D1.3/D1.3M (2008; Errata 2008) Structural Welding Code - Sheet Steel

AWS Z49.1 (2012) Safety in Welding and Cutting and

Allied Processes

ASTM INTERNATIONAL (ASTM)

ASTM A1011/A1011M (2017) Standard Specification for Steel Sheet and Strip, Hot-Rolled, Carbon, Structural, High-Strength Low-Alloy, High-Strength Low-Alloy with Improved Formability, and Ultra-High Strength

ASTM A123/A123M (2017) Standard Specification for Zinc

(Hot-Dip Galvanized) Coatings on Iron and Steel Products

ASTM A167 (2011) Standard Specification for

Stainless and Heat-Resisting Chromium-Nickel Steel Plate, Sheet, and Strip

ASTM A36/A36M (2014) Standard Specification for Carbon

Structural Steel

ASTM A653/A653M (2017) Standard Specification for Steel Sheet, Zinc-Coated (Galvanized) or Zinc-Iron Alloy-Coated (Galvannealed) by the Hot-Dip Process

ASTM B117 (2016) Standard Practice for Operating

Salt Spray (Fog) Apparatus

ASTM B152/B152M (2013) Standard Specification for Copper Sheet, Strip, Plate, and Rolled Bar

ASTM C582 (2009) Contact-Molded Reinforced

Thermosetting Plastic (RTP) Laminates for Corrosion-Resistant Equipment

ASTM C920 (2014a) Standard Specification for

Elastomeric Joint Sealants

ASTM D1330 (2004; R 2010) Rubber Sheet Gaskets

ASTM D1654 (2008; R 2016; E 2017) Standard Test Method for Evaluation of Painted or Coated Specimens Subjected to Corrosive

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Environments

ASTM D1927 (1981; R 1988) Rigid Poly(Vinyl Chloride) Plastic Sheet

ASTM D2000 (2012; R 2017) Standard Classification

System for Rubber Products in Automotive Applications

ASTM D2564 (2012) Standard Specification for Solvent

Cements for Poly(Vinyl Chloride) (PVC) Plastic Piping Systems

ASTM D2665 (2014) Standard Specification for

Poly(Vinyl Chloride) (PVC) Plastic Drain, Waste, and Vent Pipe and Fittings

ASTM D4167 (2015) Fiber-Reinforced Plastic Fans and

Blowers

CALIFORNIA DEPARTMENT OF PUBLIC HEALTH (CDPH)

CDPH SECTION 01350 (2010; Version 1.1) Standard Method for the Testing and Evaluation of Volatile Organic Chemical Emissions from Indoor Sources using Environmental Chambers

NATIONAL ELECTRICAL MANUFACTURERS ASSOCIATION (NEMA)

NEMA ICS 1 (2000; R 2015) Standard for Industrial

Control and Systems: General Requirements

NEMA ICS 2 (2000; R 2005; Errata 2008) Industrial Control and Systems Controllers, Contactors, and Overload Relays Rated 600 V

NEMA ICS 6 (1993; R 2016) Industrial Control and

Systems: Enclosures

NEMA MG 1 (2016; SUPP 2016) Motors and Generators

NATIONAL FIRE PROTECTION ASSOCIATION (NFPA)

NFPA 65 (1993) Processing and Finishing of Aluminum

NFPA 664 (2017) Standard for the Prevention of Fires and Explosions in Wood Processing and Woodworking Facilities

NFPA 70 (2017; ERTA 1-2 2017; TIA 17-1; TIA 17-2;

TIA 17-3; TIA 17-4; TIA 17-5; TIA 17-6;

TIA 17-7; TIA 17-8; TIA 17-9; TIA 17-10;

TIA 17-11; TIA 17-12; TIA 17-13; TIA

17-14) National Electrical Code

NFPA 91 (2015) Standard for Exhaust Systems for

Air Conveying of Vapors, Gases, Mists and Noncombustible Particulate Solids

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RUBBER MANUFACTURERS ASSOCIATION (RMA)

RMA IP-20 (2007) Specifications for Drives Using Classical V-Belts and Sheaves.

Specifications for A, B, C, and D Cross Sections

RMA IP-22 (2007) Specifications for Drives Using

Narrow V-Belts and Sheaves (Joint RMA/MPTA), 4th Edition

SHEET METAL AND AIR CONDITIONING CONTRACTORS' NATIONAL ASSOCIATION

(SMACNA)

SMACNA 1378 (1995) Thermoplastic Duct (PVC)

Construction Manual, 2nd Edition

SMACNA 1403 (2008) Accepted Industry Practice for Industrial Duct Construction, 2nd Edition

SMACNA 1520 (1999) Round Industrial Duct Construction

Standards, 3rd Edition

SMACNA 1922 (2004) Rectangular Industrial Duct Construction Standards, 2nd Edition

SMACNA 1972 CD (2012) HVAC Air Duct Leakage Test Manual -

2nd Edition

SOCIETY FOR PROTECTIVE COATINGS (SSPC)

SSPC Paint 11 (1992; E 2000) Paint Specification No.

11Red Iron Oxide, Zinc Chromate, Raw Linseed Oil and Alkyd Primer

SSPC Paint 20 (2002; E 2004) Zinc-Rich Primers (Type I, Inorganic, and Type II, Organic)

SSPC SP 5/NACE No. 1 (2007) White Metal Blast Cleaning

SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT (SCAQMD)

SCAQMD Rule 1168 (2017) Adhesive and Sealant Applications

U.S. DEPARTMENT OF DEFENSE (DOD)

MIL-DTL-12276 (2006; Rev E; Notice 1 2011; Notice 2 2016) Varnish, Phenolic, Baking

MIL-DTL-24441 (2009; Rev D) Paint, Epoxy-Polyamide, General Specification for

MIL-P-21035 (1991; Rev B; Notice 2 2003) Paint, High Zinc Dust Content, Galvanizing Repair (Metric)

MIL-PRF-23236 (2009; Rev D) Coating Systems for Ship

Structures

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U.S. GENERAL SERVICES ADMINISTRATION (GSA)

CID A-A-272 (Rev B; Notice 1) Caulking Compounds

FS TT-S-001543 (Rev B; Notice 1) Sealing Compound:

Silicone Rubber Base (For Calking, Sealing, and Glazing in Buildings and Other Structures)

U.S. NATIONAL ARCHIVES AND RECORDS ADMINISTRATION (NARA)

29 CFR 1910.219 Mechanical Power Transmission Apparatus

UNDERWRITERS LABORATORIES (UL)

UL 181 (2013; Reprint Apr 2017) UL Standard for Safety Factory-Made Air Ducts and Air Connectors

UL 214 (1997; Rev thru Aug 2001) Tests for

Flame-Propagation of Fabrics and Films

UL 33 (2010; Reprint Apr 2015) Heat Responsive Links for Fire-Protection Service

UL Bld Mat Dir (updated continuously online) Building

Materials Directory

1.2 GENERAL REQUIREMENTS

1.2.1 SMACNA Duct Construction Manuals

The recommendations in the Sheet Metal and Air Conditioning Contractors' National Association (SMACNA) duct construction manuals must be considered mandatory requirements. Substitute the word "must" for "should" in these manuals.

1.2.2 Fan Data

For fans include fan curves or rating tables and derating factors.

Provide certified performance curves showing total pressure, power, and mechanical efficiency versus flow rate of the operating density and fan speed. All areas of unstable operation must be indicated. For fans equipped with adjustable capacity controls such as variable inlet or vane-axial fans with adjustable blade settings, minimum and maximum performance must be indicated along with performance for fire intermediate settings.

1.2.3 Natural Ventilation

Evaluate natural ventilation for appropriate spaces, and design air distribution systems to operate in the same direction as natural ventilation to reduce energy cost of pumping outdoor air.

1.2.4 Start-Up Tests

Submit start-up tests reports in accordance with the paragraph TESTING, ADJUSTING, AND BALANCING. Submit final test report for the system tested, describing all test apparatus, instrumentation calculations, factors, flow coefficients, sound levels, and equipment data based on ACGIH-2092S recommended forms or reasonable facsimiles thereof to suit

SECTION 23 35 19.00 20 Page 12 project conditions. Adjustment and setting data must be included in test report. Submit sound level test reports for high noise level equipment.

1.3 SUBMITTALS

Government approval is required for submittals with a "G" designation;

submittals not having a "G" designation for information only. Submit the following in accordance with Section 01 33 00 SUBMITTAL PROCEDURES:

SD-02 Shop Drawings

Industrial Ventilation and Exhaust Systems; G

SD-03 Product Data

Fans; G

Ductwork, Fume Collection Steel

Ducts; G

SD-06 Test Reports

Ventilation and Exhaust System Start-Up Tests; G

Sound Level Tests; G

SD-07 Certificates

Test agency Qualifications; G

SD-10 Operation and Maintenance Data

Fans, Data Package 2; G

Industrial Ventilation and Exhaust Systems, Data Package 2; G

Submit in accordance with Section 01 78 23 OPERATION AND

MAINTENANCE DATA.

SD-11 Closeout Submittals

Posted Operating Instructions

Submit text of posted operating instructions for ventilation and exhaust systems.

1.4 QUALITY ASSURANCE

1.4.1 TAB Requirements

1.4.1.1 Test Agency Qualifications

Submit, no later than 15 calendar days after contract award, information certifying that the test agency is not affiliated with any other company participating in work on this contract. The work of the test agency shall be limited to testing and making minor adjustments to the industrial ventilation system. Submit the following information:

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a. Verification of 5 years of experience as an agency in testing industrial ventilation systems or current member of either AABC or

NEBB.

b. References from five facility managers of facilities with industrial ventilation systems that the agency has tested. A minimum of one facility shall have processes and contaminants similar to those generated by the facility in this project.

c. Registration for Professional Engineer (PE) license or Certification for an Industrial Hygienist (CIH) or Test and Balance (TAB) Engineer for the lead test engineer. Submit PE license, CIH registration number, or TAB certification number. Include the discipline, date of issue, and expiration date. Engineers shall include the state of issue.

1.5 POSTED OPERATING INSTRUCTIONS

Provide for ventilation and exhaust system. In addition, permanently mark, drill, and pin as an integral part of device, final adjustment and settings pursuant to testing, adjusting, and balancing.

1.6 SAFETY PRECAUTIONS

1.6.1 Guards and Screens

Provide metal personnel safety guards for normally accessible unducted fan inlets and discharges and moving power transmission components in accordance with OSHA 29 CFR 1910.219.

1.6.2 Welding

Conform to AWS Z49.1 for safety in welding and cutting.

PART 2 PRODUCTS

2.1 FANS, GENERAL REQUIREMENTS FOR

2.1.1 General Performance, Component, and Other Requirements

Fans must have certified performance ratings as evidenced by conformance to the requirements of AMCA 211, and must be listed in AMCA CRP, or must be currently eligible for such listing. Fans must generally be in accordance with AMCA 99 unless superseded by other requirements stated elsewhere herein. Determine performance data for fans in accordance with AMCA 210.

Select fans to minimize the exposure of personnel working in or occupying the immediate installation area. The total sound power level of the fan tests must not exceed 90 dBA when tested per AMCA 300 and rated per AMCA 301, or it must be provided with an appropriate attenuation device or devices. Scheduled fan performance is the performance required under specified or indicated installation conditions with specified or indicated accessories. The net installed air performance of the fan, with accessories / appurtenances in place, must be sufficient to meet the scheduled performance within the limits of the fan rating certification tolerance. Affix the manufacturer's product identification nameplate to each unit. Apply additional requirements for specific service or generic type or class of fan. If nonuniform air flow conditions are likely to be encountered, contact the fan manufacturer to ensure that the fan is rated for the additional fan inlet and outlet effect. Install fans to minimize fan system effect in accordance with AMCA 201. Fans must be listed in the Directory of Products licensed to use AMCA seal.

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2.1.2 Bearings and Lubrication

Precision anti-friction or sleeve type with provisions for self-alignment and for radial and thrust loads imposed by the service. Provide water-cooled bearings where required for the service or recommended by the manufacturer.

2.1.2.1 Anti-friction Bearings

Constructed of steel alloys with a certified L-10 minimum rated life of 20,000 hours under load conditions imposed by the service. Rated and selected in accordance with ABMA 9 and ABMA 11. Provide with dust-tight seals suitable for environment and lubricant pressures encountered;

cast ferrous metal housing, bolted-split pillow block type where located within fan casings; grease lubricated with provisions to prevent overheating due to excess lubricant; surface ball check type grease supply fittings. Provide manual or automatic grease pressure relief fittings visible from normal maintenance locations.

Include lubrication extension tubes where necessary to facilitate safe maintenance during operation and fill tubes with lubricant prior to equipment operation. Prelubricated, sealed, anti-friction bearings, which conform to above specified materials and L-10 life requirements, may be provided for fans requiring less than 0.37 kW 1/2 horsepower.

2.1.2.2 Sleeve Bearings

Premounted, self-aligning, continuous oil supply, single or double ring lubricated, insert type, with suitable provisions for shaft expansion and such thrust as may be imposed by service loads. Provide water cooling for shaft surface speed exceeding 6.1 meters per second 1200 feet per minute.

Provide each sleeve bearing with approximately 473 mL 16 ounce capacity constant level oiler and oil level gage. Include on sleeve bearing submittal data: Bearing manufacturing source, type, lubricant, clearances, "L/D" ratio, antifriction metal, belt angle, shaft speed, shaft critical speed, Brinell hardness at journal, and shaft surface finish at journal in micro-inches.

2.1.3 Motors and Motor Starters

Power (kW) Voltage Type Starter

Up to 5 1/2 208-230 Across-the-line magnetic

5 1/2 to 11 208-230 Across-the-line magnetic part winding or wye delta

11 to 22 3/8 460 Across-the-line magnetic part winding or wye delta

Above 11 208-230 Part winding or wye delta

Above 22 1/2 460 Part winding or wye delta

Motor H.P. Voltage Type Starter

Up to 7 1/2 208-230 Across-the-line magnetic

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7 1/2 to 15 208-230 Across-the-line magnetic part winding or wye delta

15 to 30 460 Across-the-line magnetic part winding or wye delta

Above 15 208-230 Part winding or wye delta

Above 30 460 Part winding or wye delta

Conform to NEMA MG 1 and NEMA ICS 1 and NEMA ICS 2. Motors less than 3/4 kW one hp must meet NEMA High Efficiency requirements. Motors 3/4 kW one hp and larger must meet NEMA Premium Efficiency requirements. Motors must not exceed 1800 rpm, unless otherwise indicated, and must be variable-speed, dripproof enclosure type. Provide magnetic-across-the-line type motor starters with weather resistant NEMA 3R enclosure in accordance with NEMA ICS 6. Provide single-phase motors with inherent thermal overload protection with manual reset. Provide three-phase motors with thermal overload protection in the control panel. Provide permanently lubricated or grease-lubricated ball or roller bearings; auxiliary lubrication and relief fittings on outside of fan casing; arrange grease lines to minimize pressure on bearing seals. Motor power must not be less than brake power required with blades set at maximum pitch angle at any air delivery from the indicated amount down to 50 percent thereof.

2.1.4 Guards and Screens

Construct guards and screens to provide, as applicable: required strength and clearance with minimal reduction in free area at fan inlets and discharges; cooling; access panels for tachometer readings; ease of sectional disassembly for maintenance and inspection functions where guard total weight exceeds 22.70 kg 50 pounds; weather protection where components are weather exposed. Installed guards and screens must not negate noise control and vibration isolation provisions.

2.1.5 Power Transmission Components

2.1.5.1 Fan Drives

Direct or V-belt type as indicated. V-belt drives must conform to RMA IP-20 and RMA IP-22. Drives must be applied in accordance with the manufacturer's published recommendations, unless specified otherwise. Base power rating of a V-belt drive on maximum pitch diameter of sheaves. Provide classical belt section adjustable sheave type, with a minimum service factor of 1.5 for drives with motors rated up to and including 22 kW 30 hp. Provide classical section or narrow section, fixed sheave or adjustable sheave type with a minimum 1.5 service factor for drives with motors rated over 22 kW 30 hp.

Provide at least two belts for drives with motors rated one hp and above.

2.1.5.2 Sheaves

Statically and dynamically balanced, machined cast ferrous metal or machined carbon steel, bushing type, secured by key and keyway. Pitch diameter or fixed sheaves and adjustable sheaves, when adjusted to specified limits, must not be less than that recommended by NEMA MG 1.

Select adjustable sheaves that provide the required operating speed with the sheave set at midpoint of its adjustment range. The adjustment range for various size and type belts must be: 16 percent, minimum for Classical

SECTION 23 35 19.00 20 Page 16 section belts; 12 percent, minimum for Narrow section belts. Belt deflection in adjustable sheave drives must not exceed 1 1/2 degrees.

Provide companion sheaves for adjustable sheave drives with wide groove spacing to match driving sheaves, except that standard fixed pitch spacing may be used for all two-through-four groove drives whose center-to-center dimensions exceed the following: "A" and "B" Section 406 mm 16 inches; "C" Section 635 mm 25 inches; "D" Section 914 mm 36 inches. Furnish endless, static dissipating, oil-resistant, synthetic cloth or filament reinforced elastomer construction belts.

2.1.7 Protective Coating for Fans

Prepare and coat fans as follows: Replace bolts required to provide access or adjustment and normally threaded into the coated surface with studs or bolts having heads continuously welded inside. Omit sharp edges, self-tapping screws, and permanent threads protruding into the coated surface. Eliminate hairline cracks and sharp inside corners by continuous welding, brazing, or filling with high melting point solder. Seal impeller hub to the shaft. Construct housing split to use external through-bolts.

Flange inlet and outlet and consider as fan interior. Peen or grind welds smooth, and grind outside corners to approximately 1.60 mm 1/16 inch radius. Sandblast metal surfaces to white metal in accordance with SSPC SP 5/NACE No. 1. Coat interior surfaces of housing in contact with airstream, including inlet, impeller and shaft, flange faces, shaft seal, exterior surfaces of housing, and bearing and motor pedestal. Do not coat bearings, coupling, motor, drive, or other auxiliaries. Prepare and coat stainless steel shaft. Finish fan in accordance with the manufacturer's standard practice. Statically and dynamically balance the fan in two planes after coating and finishing, and where material has been removed, refinish and rebalance the fan as specified herein.

2.2 CENTRIFUGAL FANS

2.2.1 General Requirements for Centrifugal Fans

Provide fan of backward inclined type blades with manual or automatic inlet vanes. Arrange fans for indicated service, and construct for the applicable AMCA 99Class pressure ratings as indicated for system design pressure and temperature. Fan shaft must be solid steel, ground and finished as required for the service, with first critical speed a minimum 25 percent higher than cataloged fan speed. Select fan for maximum efficiency, minimum noise, and stability during all modes of system operation. Vibration isolation mountings must be spring type and limit vibration transmissibility to a maximum 5 percent of the unbalanced force at lowest equipment speed, unless otherwise specified or indicated. Arrangement and drives must be as indicated.

2.2.2 In-line Centrifugal Fans

Welded steel casings, centrifugal backward inclined blades, stationary discharge conversion vanes, internal and external belt guards and adjustable motor mounts. Inlet and outlet connections for fan casings to duct work and equipment casings, may be of the slip fit or flanged type.

Provide guards for discharges. Rate fans with guards in place. Air must enter and leave the fan axially. Inlet must be streamlined and conversion vanes must eliminate turbulence and provide smooth discharge air flow.

Enclose fan bearings and drive shafts, and isolate from the air stream.

Fan bearings must be mechanically sealed against dust and dirt and must be self-aligning, pillow block ball or roller type. Motor and drive must be provided by fan manufacturer.

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2.3.1 Fan Impeller Blades

Air-foil type with stationary guide vanes, designed to provide the efficiency indicated. In fan selection, consider and account for any losses due to the size of the motor in relation to the fan hub diameter.

Impeller blades of direct-driven fans must be adjustable to permit varying performance over a range of volume and pressure. Index the hub to facilitate setting the angle of the blades uniformly and accurately from minimum to maximum angle; provide stops to avoid overloading motor.

Furnish motor with the factory blade maximum setting included in the fan nameplate data.

2.4 BASIC MATERIALS

2.4.1 Coated and Uncoated Carbon Steel Sheets, Plates, and Shapes

2.4.1.1 Mill Galvanized Steel Sheet

ASTM A653/A653M, lock forming quality, Coating G-90

2.4.1.2 Mill Galvanized Steel Shapes

ASTM A36/A36M galvanized in accordance with ASTM A123/A123M or

ASTM A653/A653M.

2.5.2 Corrosion Protection

Treat equipment fabricated from ferrous metals that do not have a zinc coating conforming to ASTM A123/A123M or ASTM A653/A653M for prevention of corrosion with a factory coating or paint system that will withstand 125 hours in a salt-spray fog test except that equipment located outdoors must withstand 500 hours. Perform salt-spray fog test in accordance with ASTM B117. Each specimen must have a standard scribe mark as defined in ASTM D1654. Upon completion of exposure, evaluate and rate the coating or paint system in accordance with procedures A and B of ASTM D1654. The rating of failure at the scribe mark must be not less than six (average creepage not greater than 3 mm 1/8 inch). The rating of the unscribed area must be less than ten (no failure). Thickness of coating or paint system on the actual equipment must be identical to that on the test specimens with respect to materials, conditions of application, and dry-film thickness.

2.6.1 Unit Casing

Provide a self supporting unit casing constructed of minimum 1.1 mm 0.04 inches thick extruded aluminum profiles and aluminum zinc sheet steel that create a double wall. The base of the casing must be constructed as a continuous condensate drain with a total of four connection possibilities.

The casing bottom, top, and sides must be insulated with 50 mm 2 inch thick fibrous glass insulation with a minimum density of 96 kg per cubic meter 6 lb per cubic foot or another material with equivalent insulating value. [ Provide a partition to isolate the exhaust and supply airstreams from each other to avoid cross contamination.] Partition must be a minimum of [1.9][_____] mm [0.075][_____] inches [galvanized steel] [aluminum]. Provide stainless steel casing for corrosive air streams. The casing must be designed for diagonal mounting of the heat exchanger access from the side for maintenance and cleaning. The casing must be designed with an integral defrost control damper on the heat exchanger section for defrost control. Provide full size access doors for checking the heat

SECTION 23 35 19.00 20 Page 18 exchanger section.

2.6.2 Heat Exchanger Section

2.6.3 Enthalpy Wheel

A desiccant-impregnated enthalpy wheel with variable speed rotary wheel must be used in the supply and exhaust systems. Wheels must contain media made of a lightweight polymer that is coated with a corrosion-resistant finish. Etched or oxidized surfaces are not acceptable. Heat transfer surfaces must be coated with a non-migrating (permanently bonded) absorbent. Wheel must allow laminar flow but not radial, and prevent leakage, bypassing, and cross contamination by cross flow within wheel.

The wheel must have rotor seals specifically designed to limit cross-contamination, and a rotation detector. Should rotation stop, the rotation detector must alarm the HVAC control system. Wheel must not condense water directly or require a condensate drain for summer or winter operation.

Performance rating must be in accordance with AHRI 1060 I-P.

2.6.4 Angle Filter Box

Provide a side access, galvanized steel duct mounted filter box assembly with integral holding frames suitable for accommodating 50 mm 2 inch thick filters with a minimum efficiency reporting value of 13. Provide filter box constructed of minimum 1.3 mm 0.05 inch thick galvanized steel with extruded aluminum tracks and individual universal holding frames with polyurethane foam gaskets and positive sealing clips designed to accommodate various standard size filters in various efficiency ranges.

Provide access doors with positive sealing, heavy duty quick opening half-twist latches and sponge neoprene gasketing on each side of filter box for removal and replacement of filters. For each filter box provide one magnehelic gauge or inclined manometer with static pressure taps, shut-off and vent cocks, and aluminum tubing with range 50 to 1470 Pa 0.0073 to

0.21 psi.

2.7 MISCELLANEOUS MATERIALS

2.8.4 Gaskets

2.8.4.1 Elastomer Buna N

Sheet, 3 mm 1/8 inch thick, conforming to ASTM D2000, Type 2BG410B14.

2.8.4.2 Elastomer Chloroprene

Sheet, 3 mm 1/8 inch thick, conforming to ASTM D2000, Type 2BE410B14.

2.8.4.3 Rubber

Sheet, 3 mm 1/8 inch thick red or black, natural, reclaimed, synthetic rubber or mixture thereof, conforming to ASTM D1330.

2.8.6 Protective Coating Materials

2.8.6.1 Baked Unmodified Phenolic

MIL-DTL-12276, Type II.

2.8.6.2 Epoxy Coating

SECTION 23 35 19.00 20 Page 19

Conform to MIL-PRF-23236, Type I, Class 1 or MIL-DTL-24441 system, Formula 150 green primer 0.076 mm 3 mils, Formula 151 haze gray 0.076 mm 3 mils, and Formula 152 white 0.076 mm 3 mils.

2.8.6.3 Inorganic Zinc Coating

SSPC Paint 20, Type I-C (Self-cure type).

2.8.6.4 Galvanizing Repair Paint

Conform to MIL-P-21035.

2.8.8 Sealants

2.8.8.1 Elastomeric

Sealant specified in these specifications or referenced standards as elastomeric or without further qualification, must be silicone, polyurethane, polysulfide, polyisobutylene, or acrylic terpolymer suitable for the service. For sealing of nongasketed duct joints during fabrication or assembly, sealant must be polyurethane, acrylic terpolymer or polysulfide. Sealants must conform to the following:

a. Silicone: Conforming to FS TT-S-001543, single component type, not requiring primed substrate, with manufacturer published estimated life of 30 years and a maximum 5 percent shrinkage when cured.

b. Polyurethane: Conforming to ASTM C920, Type 2, Class A, single component type, not requiring primed substrate, with manufacturer published estimated life of 20 years and a maximum 10 percent shrinkage when cured.

c. Polysulfide: Conforming to ASTM C920, Type 2, Class A, single published estimated life of 20 years and a maximum 10 percent shrinkage

d. Polyisobutylene/Butyl: Conforming to CID A-A-272, Type 1, single published estimated life of 10 years and a maximum 15 percent shrinkage

e. Acrylic Terpolymer: Conforming to ASTM C920, single component type, not requiring primed substrate, with manufacturer's published estimated life of 20 years and a maximum 10 percent shrinkage when cured.

f. Provide sealants and non-aerosol adhesive products meeting either emissions requirements of CDPH SECTION 01350 (limit requirements for either office or classroom spaces regardless of space type) or VOC content requirements of SCAQMD Rule 1168 (HVAC duct sealants must be classified in the "Other" category within the SCAQMD Rule 1160 sealants table). Provide validation of indoor air quality for duct sealants.

2.8.8.2 Hard Cast Caulking for Exterior Ducts

Mineral and adhesive impregnated woven fiber tape with adhesive activator for exterior round or rectangular duct joints.

2.8.8.3 Caulking of Building Surface Penetration

Foamed silicones, two-component, fire-resistant, low-exotherm, SECTION 23 35 19.00 20 Page 20 room temperature vulcanizing silicone.

2.10 SUPPORTS AND HANGERS

2.10.1 General Requirements for Supporting Elements

Provide ducting systems and equipment supporting elements including but not limited to building structure attachments; supplementary steel; hanger rods, stanchions and fixtures; vertical duct attachments; horizontal duct attachments; anchors; supports. Design supporting elements for stresses imposed by systems, with a minimum safety factor of 4.0 based on duct being 50 percent full of particulate conveyed. Supporting elements must conform to SMACNA 1403, SMACNA 1922, SMACNA 1520, and NFPA 91, as applicable, and modified and supplementary requirements specified herein. Do not use weld studs and powder actuated anchoring devices to support mechanical systems components without prior approval.

2.10.2 Vertical Attachments

Provide in accordance with SMACNA Standards, except mill galvanized iron straps must be a minimum of 25 mm one inch wide, 16 gage thick.

2.10.3 Horizontal Attachments

Provide as indicated in accordance with SMACNA Standards.

2.10.4 Supplementary Steel

Provide where required to frame structural members between existing members or where structural members are used in lieu of commercially rated supports. Such supplementary steel must be fabricated in accordance with the AISC 360.

2.11 DUCTWORK, DUST AND FUME COLLECTION

2.11.1 Fabrication of Dust and Fume Collection Ductwork

Provide indicated sizes, lengths and configuration without deviation unless otherwise approved. Assemble ductwork airtight and include necessary reinforcements, bracing, supports, framing, gasketing and fastening to guarantee rigid construction and freedom from vibration, airflow induced motion, and excessive deflection. Provide SMACNA Class 1 construction with any of the reference standard seams and connections being acceptable.

Provide elbows and fittings a minimum 2 gages heavier than straight ducts of equal diameter.

2.11.2 Radius Elbows

Fabricated from butt welded specified piece gore sections or from formed welded or seamless tubing to a minimum centerline radius of 1.5 diameters. Assemble, weld, and finish ground gore sections to eliminate internal projections. Construct gored elbow in accordance with the following:

400 mm diameter and less 16 inches diameter and less

Over 400 mm diameter Over 16 inches diameter

90 degree - 5 piece minimum 90 degree - 7 piece minimum

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60 degree - 4 piece minimum 60 degree - 6 piece minimum

45 degree - 3 piece minimum 45 degree - 5 piece minimum

30 degree - 3 piece minimum 30 degree - 4 piece minimum

15 degree - 2 piece minimum 15 degree - 3 piece minimum

2.14.1 Basic Ductwork Materials

Fabricate ducts, accessories and components in sheet form from materials conforming to ASTM C582. Construct metal components, when permitted to be located interior to the duct, of Type 316 corrosion resistant steel.

2.14.2 Fasteners

Where penetration of duct surfaces is approved or specified, provide Type 316 corrosion resistant steel fastener assemblies encapsulated with polyester on duct interior, unless total disassembly is intended. Provide flange fastener bolts and nuts of hex type only, cadmium plated, unless exposed to corrosive fumes; in which case provide Type 316 stainless steel.

Equip bolted assemblies with two oversized washers, except where assembled with metallic reinforcement contact. Plastic bolting is prohibited.

2.14.3 Fabrication

Construct water washable, watertight, self-draining, and airtight ductwork as specified or indicated. Provide required reinforcements, bracing, supports, framing, gasketing, sealing, resilient mounting, drainage provisions, and fastening to guarantee rigid construction and freedom from vibration, airflow induced motion and noise, and excessive deflection at specified maximum system pressure and velocity.

PART 3 EXECUTION

3.1 INSTALLATION

3.1.1 Installation Requirements

Install in accordance to NFPA 91, and SMACNA 1922, and SMACNA 1520.

Provide mounting and supports for equipment, ductwork, and accessories, including structural supports, hangers, vibration isolators, stands, clamps and brackets, access doors, blast gates, and dampers. Install accessories in accordance with the manufacturer's instructions. Construct positive pressure duct inside buildings airtight.

3.1.5.1 Duct Supports

Isolate duct support contact surfaces from supporting steel by 6 mm 1/4 inch thick closed-cell foamed cellular elastomer insulation material of a width greater than support. Design duct supporting system to include additional weight due to collection of condensate and washing water in nondrainable, deflected surface and other areas.

3.1.6 Miscellaneous Sheet Metal Work

Provide custom fume hood, fabricated from mill galvanized steel, as

SECTION 23 35 19.00 20 Page 22 indicated. Sheet metal thickness, reinforcement and fabrication, where not indicated, must conform to SMACNA 1403.

3.1.7 Building Penetrations

3.1.7.1 General Penetration Requirements

Provide properly sized, fabricated, located, and trade coordinated sleeves and prepared openings, for duct mains, branches, and other item penetrations, during the construction of the surface to be penetrated.

Provide sleeves for round duct 380 mm 15 inches and smaller and prepared openings for round duct larger than 380 mm 15 inches and square or rectangular duct. Fabricate sleeves, except as otherwise specified or indicated, from 20 gage, 1.00 mm 0.0396 inch thick mill galvanized sheet metal. Sleeves penetrating load bearing surfaces must be standard weight galvanized steel pipe. Provide roof penetrations as shown in SMACNA 1403.

3.1.7.2 Clearances

Provide a minimum 25 mm one inch clearance between penetrating and penetrated surfaces. Fill clearance space with bulk fibrous glass or mineral wood or foamed silicone and seal and close.

3.1.7.3 Tightness

Penetration must be weathertight.

3.1.7.4 Sealants

Provide sealant of elastomeric type or foamed silicone type, as specified under paragraph SEALANTS in this section. Apply to oil free surfaces to a minimum 10 mm 3/8 inch depth.

3.1.7.5 Closure Collars

Provide a minimum 100 mm 4 inches wide, unless otherwise indicated, for exposed ducts and items on each side of penetrated surface, except where equipment is installed. Install collar tight against the surface and fit snugly around penetrating item without contact. Grind sharp edges smooth to prevent damage to penetrating surface. Fabricate collars for round ducts 380 mm 15 inches in diameter or less from 20 gage, 1.00 mm 0.0396 inch nominal thickness, mill galvanized steel. Attach collars a minimum of 4 fasteners to where the opening is 300 mm 12 inches in diameter or less, and a minimum of 8 fasteners where the opening is 500 mm 20 inches in diameter or less. Fabricate collars for square and rectangular ducts with a maximum side of 380 mm 15 inches or less from 20 gage, 1.00 mm

0.0396 inch nominal thickness, mill galvanized steel. Fabricate collars for round, square, and rectangular ducts with minimum dimension over 380 mm 15 inches from 18 gage, 1.40 mm 0.0516 inch in nominal thickness, mill galvanized steel. Install collars with fasteners a maximum of 150 mm 6 inches on center.

3.1.8 Installation of Supports

3.1.8.1 Selection

Select duct and equipment support system taking into account the best practice recommendations and requirements of SMACNA 1922, SMACNA 1520, and NFPA 91; location and precedence of work under other sections;

interferences of various piping and electrical work; facility equipment;

building configuration; structural and safety factor requirements;

SECTION 23 35 19.00 20 Page 23 vibration and imposed loads under normal and abnormal service conditions.

Indicated support sizes, configurations, and spacings are the minimal type of supporting component required for normal loads. Where installed loads are excessive for the normal support spacings, provide heavier duty components or reduce the element spacing. After system start-up, replace or correct support elements which vibrate and cause noise or possible fatigue failure. Exercise special care to prevent cascading failure.

3.1.8.2 General Requirement for Supports

Securely attach supporting elements to building structural steel or structural slabs. Where supports are required between building structural members provide supplementary structural steel as specified for work under this section. On submittals show location of supports and anchors and loads imposed on each point of support or anchor. Do not hang ductwork or equipment from piping, or other ducts or equipment. Attach supports to structural framing member and concrete slab. Do not anchor supports to metal decking unless a means is provided and approved for preventing the anchor from puncturing the metal decking. Where supports are required, between structural framing members, provide suitable intermediate metal framing. Where C-clamps are used, provide retainer clips. A maximum span of 3 meters 10 feet must exist between any two points, with lesser spans as specified or as required by duct assemblies, interferences, and loads imposed or permitted. Provide a minimum one set of two vertical support elements for each point of support and each length of duct, except as otherwise specified. Install supports on both sides of all duct turns, branch fittings, and transitions. Cross-brace hangers sufficiently to eliminate sway. Perforated strap hangers are prohibited. Where ductwork system contains heavy equipment, hang such equipment independently of the ductwork. Duct supports must be vibration isolated from structure at points indicated. Provide vibration isolators in indicated discharge ducting system for a minimum distance of 15 meters beyond the fan.

3.1.8.3 Methods of Attachment

Construct masonry anchors selected for overhead applications of ferrous materials only. Install masonry anchors in rotary, non-percussion, electric drilled holes. Self-drilling anchors may be used provided masonry drilling is performed with electric hammers selected and applied in such a manner as to prevent concrete spalling or cracking. Pneumatic tools are prohibited.

3.1.15 Factory and Field Painting and Finishing

3.1.15.1 Factory Work

Factory finish interior ferrous metal and other specified metallic equipment and component surfaces with manufacturer's standard surface preparation, primer, and finish coating. Factory finish exterior to building space ferrous metal surfaces and other exterior to building and interior to building metallic or nonmetallic surfaces with specified protective coating system in accordance with the paragraph PROTECTIVE COATING MATERIAL in this section and otherwise with manufacturer's standard surface preparation, primer and finish which meet the requirements of paragraph CORROSION PREVENTION.

3.1.15.2 Field Work

Touch-up or if necessary, repaint factory applied finishes which are marred, damaged, or degraded during shipping, storage, handling, or installation to match the original finish.

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3.2 TESTING, ADJUSTING, AND BALANCING

3.2.1 Power Transmission Components Adjustment

Test and adjust V-belts and sheaves for proper alignment and tension preliminary to operation and after 72 hours of operation at final speed, in the presence of the Contracting Officer. Belts on drive side must be uniformly loaded, not bouncing. Align direct-drive couplings to less than half of manufacturer's allowable range of misalignment.

3.2.2 Preliminary Tests

Conduct an operational test on the entire exhaust duct systems, components, and equipment for a period of not less than 6 hours after power transmission components are adjusted. Replace filters, if any, after preliminary tests and prior to conducting final acceptance tests.

3.2.3 Testing, Adjusting, and Balancing Work

Perform work in accordance with the applicable and recommended procedures of: ACGIH-2092S. Provide apparatus, certified, calibrated, instrumentation including that to measure sound levels, motor current, and power factor. Unless approved otherwise, instruments must be limited to manometers and approved aneroid type gages (such as a Magnehelic).

Velometers may be used for low velocity measurements if approved by the Contracting Officer.

3.2.4 Systems Volume Acceptance Criteria

Systems final volume must be within the following limits:

Fan: Plus 10 percent, minus zero percent of design volume at design temperature

Hood or Equipment: Plus 10 percent, minus zero percent of design volume at design temperature

Note: Tolerances must be taken on clean.

3.2.5 Sound Level Tests

Report to the Contracting Officer in writing, sound levels higher than 84 dBA at hoods or at workers' normal operating positions at equipment in addition to being included in the required test reports.

3.3 SYSTEM OPERATION DEMONSTRATION

After systems and equipment testing, adjusting, and balancing has been completed and accepted, demonstrate the complete and correct functioning of systems equipment and controls by operation through normal ranges and sequences, and by simulation of abnormal conditions. Manually and automatically cause every device to function as intended. Readjust, as necessary, any settings and after sufficient operating time, but not less than 6 hours, verify ability of equipment and controls to establish and maintain stable and accurate operation and required system performance.

Note any abnormal deviations, such as excessive vibration, noise, and heat, binding damper mechanisms, and incorrect fan rotation. Make any necessary repairs, replacements or adjustments.

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3.4 SCHEDULE

Some metric measurements in this section are based on mathematical conversion of inch-pound measurements, and not on metric measurements commonly agreed on by the manufacturers or other parties. The inch-pound and metric measurements shown are as follows:

Products Inch-Pound Metric

a. Motors: Capacity = 7 1/2 hp = 5 1/2 kW

= 15 hp = 11 kW

= 30 hp = 22 3/8 kW

b. Gaskets: Thickness = 1/8 inch = 3 mm

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