SECTION 15887

CARBON MONOXIDE EXHAUST SYSTEMS

PART 1 GENERAL

SECTION INCLUDES

Exhaust fans.

Ductwork and duct fittings.

Inlet fittings.

Accessories.

Carbon monoxide detectors.

RELATED SECTIONS

Section 15170 - Motors: Fan motors.

Section 15242 - Vibration Isolation: Isolators.

REFERENCES

ACGIH - Industrial Ventilation, A Manual of Recommended Practice.

AMCA 99 - Standards Handbook.

AMCA 210 - Laboratory Methods of Testing Fans for Rating Purposes.

AMCA 300 - Test Code for Sound Rating Air Moving Devices.

AMCA 301 - Method of Calculating Fan Sound Ratings from Laboratory Test Data.

ASTM A 90 - Weight of Coating on Zinc-Coated (Galvanized) Iron or Sheet Articles.

ASTM A 167 - Stainless and Heat-resisting Chromium-Nickel Steel Plate, Sheet, and Strip.

ASTM A 525 - General Requirements for Steel Sheet, Zinc-Coated (Galvanized) by the Hot-Dip Process.

ASTM A 527 - Steel Sheet, Zinc Coated (Galvanized) by Hot-Dip Process, Lock Forming Quality.

ASTM C 14 - Concrete Sewer, Storm Drain, and Culvert Pipe.

ASTM C 443 - Joints for Circular Concrete Sewer and Culvert Pipe, Using Rubber Gaskets.

SMACNA - HVAC Duct Construction Standards - Metal and Flexible.

SMACNA - Rectangular Industrial Duct Construction

SMACNA - Round Industrial Duct Construction Standard.

UL 214 - Tests for Flame-Propagation of Fabrics and Films.

SUBMITTALS

Submit under provisions of Section [01300] [_____].

Shop Drawings: Indicate dimensions, sizes, weights and point loadings, and locations and sizes of field connections.

Product Data: Provide manufacturers literature and data sheets indicating rated capacities, dimensions, weights and point loadings, accessories, electrical requirements and wiring diagrams, and location and sizes of field connections.

Provide fan curves with specified operating point clearly plotted.

Submit sound power levels for both fan inlet and outlet at rated capacity.

Manufacturer's Installation Instruction:	Indicate assembly and installation instructions.

OPERATION AND MAINTENANCE DATA

Submit under provisions of Section [01700] [_______].

Operation Data: Include instructions for fan lubrication, motor and drive replacement, spare parts list, and wiring diagrams.

QUALITY ASSURANCE

Performance Ratings: Conform to AMCA 210 [and bear the AMCA Certified Rating Seal.]

Sound Ratings: AMCA 301, tested to AMCA 300 [, and bear AMCA Certified Sound Rating Seal.]

Fabrication: Conform to AMCA 99.

QUALIFICATIONS

Manufacturer: Company specializing in manufacturing the products specified in this Section with minimum [three] [_____] years [documented] experience.

PART 2 PRODUCTS

SYSTEMS MANUFACTURERS

[_____________________________].

[_____________________________].

[_____________________________].

Substitutions: Under provisions of Section [01600] [____].

CENTRIFUGAL FANS

Manufacturers:

[________________________].

[________________________].

[________________________].

Base performance on [sea level] [_____________] conditions.

Performance:

Air Flow: [______] CFM ([_______] L/sec) at [_________] inch wg ([______] Pa) external static pressure.

Motor: [______] hp, [_____] volt, [single] [three] phase, 60 Hz.

Refer to Fan Schedule.

Model: [___________] manufactured by [_________________].

Wheel and Inlet:	Steel construction with smooth curved inlet flange, heavy back plate, backwardly curved blades welded or riveted to flange and back plate; cast iron hub riveted to back plate and keyed to shaft with set screws.

Housing:	Heavy gauge steel, [spot welded] [continuously welded] with inlet bell and shaped cut-off, factory finished with enamel or prime coat.

Motors and Drives:

Motors: As indicated, in compliance with Section 15170.

Bearings: Heavy duty pillow block type, self aligning, greaselubricated ball bearings or roller bearings.

Shafts: Hot rolled steel, ground and polished, with key-way, protectively coated with lubricating oil.

V-Belt Drive: Cast iron or steel sheaves, dynamically balanced, keyed, variable and adjustable pitch, matched belts, and rated minimum 1.5 times nameplate rating of motor.

Belt Guard: Fabricate to SMACNA HVAC Duct Construction Standards - Metal and Flexible; of 12 gage (2.8 mm), 3/4 inch (20 mm) diamond mesh wire screen welded to steel angle frame or equivalent, prime coated.

DUCTWORK AND DUCT ACCESSORIES

Materials:

Galvanized Steel Ducts: ASTM A 525 or ASTM A 527 galvanized steel sheet, lock-forming quality, having G 90 zinc coating in conformance with ASTM A 90.

Coated Galvanized Steel Ducts: ASTM A 525 or ASTM A 527 galvanized steel sheet, lock-forming quality, having zinc G 90 coating in conformance with ASTM A 90, with 4 mil (0.1 mm) polyvinyl chloride coating inside and out.

Coating for Buried Ducts: Asphalt base, [_______], manufac-tured by [ _________-___].

Glass Fiber Reinforced Plastic Ducts: [________________.]

Concrete Ducts: ASTM C14; hub and spigot concrete sewer pipe with ANSI/ASTM C443 joints, rubber gaskets.

Ductwork

Fabricate and support in accordance with SMACNA [HVAC Duct Construction Standards - Metal and Flexible] [Round Industrial Duct Construction Standard and Rectangular Industrial Duct Construction Standard] and ACGIH Industrial Ventilation Manual except as indicated.

Construct T's, bends, and elbows with radius of not less than 11/2 times width of duct on centerline.

Increase duct sizes gradually, not exceeding 15 degrees divergence wherever possible. Divergence upstream of equipment shall not exceed 30 degrees; convergence downstream shall not exceed 45 degrees.

Fabricate continuously welded round and oval duct fittings two gauges heavier than duct gauges indicated in SMACNA Standard.

Use crimp joints with or without bead for joining round duct sizes [8] [ ___] inch ([200] [ ___] mm) and smaller with crimp in direction of air flow, with liquid adhesive plus sheet metal screws.

Joints shall be minimum 4 inch (100 mm) cemented slip joint, brazed or electric welded. Prime coat welded joints.

Provide standard 45 degree lateral wye branch fittings unless otherwise indicated.

Use double nuts and lock washers on threaded rod supports.

Buried ducts may be [concrete encased sheet metal] [PVC jacketed sheet metal] [fiber glass reinforced plastic] [concrete] as indicated. Fabricate buried metal ductwork using two gages heavier material than indicated for 2 inch WG (500 Pa) SMACNA pressure class.

Flexible Connectors:	UL 214 listed, fire-retardant polyethylene impregnated fabric, minimum density [20] [36] oz per sq yd ([0.68] [1.22] kg/sq m), approximately [2] [3] [6] inches ([50] [75] [150] mm) wide, crimped into metal edging strip.

Blast Gases: [Half] [Full] collar of [cast aluminum] [steel], with galvanized steel slide.

EXHAUST SYSTEM ACCESSORIES

Tail Pipe Adapters: [Rubber] [Minimum 20 gage (0.9 mm)] [galvanized steel] [stainless steel] formed to tapered cone with spring clip attachment, adapter size [6 inch (150 mm)] [8 inch (200 mm)] [_________] [as indicated], for connection to [3 inch (80 mm)] [4 inch (100 mm)] [5 inch (125 mm)] diameter hose.

Flexible Exhaust Hose: [Heat resistant neoprene coated spring steel wire reinforced] [[28] [26] gage ([4] [5] mm) [galvanized] [stainless] steel], rated for duty to [260] [300] [600] [____] degrees F ([125] [150] [315] [____] degrees C) and 20 inches WG (5 kPa) positive or negative.

Overhead Suspension System: System to support overhead hose consisting of 5/16 inch (8 mm) diameter nylon cable, 2 inch (50 mm) diameter cadmium plated cast steel swivel pulleys, 6 inch (150 mm) cadmium plated cast steel cleats.

Exhaust Hose Reel: Spring operated, manually controlled reel consisting of metal cylinder with internal [aluminum] [steel] flexible pipe, zinc plated steel stand, two steel springs, brake mechanism, hose stop, hose guide and [16] [23] [33] feet ([5] [7] [10] meters) of [3 inch (80 mm)] [4 inch (100 mm)] [5 inch (125 mm)] diameter hose.

CARBON MONOXIDE DETECTORS

Manufacturers:

[__________________________].

[__________________________].

[__________________________].

Continuous Carbon Monoxide Gas Detector:

[Single level] [Dual level, each] factory or field calibrated from 35 to 300 PPM.

[Single channel with integral sensor] [Multiple channel with up to [______] modules each coupled to an external sensor].

Remote sensors may be located up to 1000 feet (300 meters) and connected with 4 wires.

Indicator lights for set points, and sensor wire break.

Control contacts: 10 amp DPDT [and 1 amp SPDT from each sensor].

Power:	[_____] volt, single phase, 60 Hz.

Model: [_______] manufactured by [____________________].

PART 3 EXECUTION

INSTALLATION

Install equipment in accordance with manufacturers instructions.

Do not operate fans for any purpose until ductwork is clean, bearings lubricated, and fan has been test run under observation.

Install fans with resilient mounting and flexible electrical leads. Refer to Section 15242.

Install flexible connections at fan inlet [and discharge]. Ensure metal bands of connectors are parallel with minimum one inch (25 mm) flex between ductwork and fan while running.

Provide pitot tube openings where required for testing of systems, complete with metal cap with spring device or screw to ensure against air leakage.

Locate ducts with sufficient space around equipment to allow normal operating and maintenance activities.

Slope underground ducts to plenums or low pump out points at l:500. Provide access doors for inspection.

Paint buried metal ductwork with one coat [and seams and joints with additional coat] of asphalt base protective coating.

Tape joints of PVC coated metal ductwork with PVC tape.

Encase buried metal ductwork in 3 inch (75 mm) minimum of concrete. Provide adequate tie-down points to prevent ducts from floating during concrete placement.

FAN SCHEDULE

Drawing_Code	F-1	F-2	F-3	F-4

Manufacturer

Model

Fan Type

Wheel Type

Class

Arrangement

Size

Air Flow Capacity

Static Pressure

Drive

Motor size

Motor Volt/Phase/Cycle

END OF SECTION