MCC Veterinary Technology & Sustainable Horticulture SPS+ Architects, LLP

Maricopa Community Colleges Project Number E2500010

LABORATORY FUME HOODS 11 5313-1

SECTION 11 5313

LABORATORY FUME HOODS

PART 1 – GENERAL

1.1 RELATED DOCUMENTS

A. Drawings and general provisions of the Contract, including General and Supplementary

Conditions and Division 01 Sections, apply to this Section.

1.2 SUMMARY

A. Section Includes:

1. Laboratory fume hoods types as indicated on drawings.

2. Piping and wiring within fume hoods for service fittings, light fixtures, and other electrical devices included with fume hoods.

3. Fume hood base cabinets.

4. Fume hood base stands.

5. Work tops within fume hoods.

6. Electrical service fittings in fume hoods.

1.3 QUALITY ASSURANCE

A. Product Standard: SEFA 1 and UL listed and labeled for compliance with UL 1805.

B. Safety Glass: 16 CFR 1201 for Category II materials.

C. Electrical Components, Devices and Accessories: Listed and labeled per NFPA 70.

1.4 SUBMITTALS – GENERAL

A. Submit Laboratory Fume Hood submittals concurrent and coordinated with laboratory casework submittals.

1.5 ACTION SUBMITTALS

A. Product Data: For each type of product.

B. Shop Drawings: For laboratory fume hoods.

1. Include plans, elevations, sections, and attachment details. Include layout of fume hoods in relation to laboratory casework, equipment and other building construction.

2. Indicate details for anchoring fume hoods to permanent building construction including locations of blocking and other supports.

3. Indicate duct connections, electrical connections, and locations of access panels.

4. Include roughing-in information for mechanical and electrical connections.

C. Samples: For fume hood exterior finishes, interior lining and work top material(s), service fitting finishes and other materials requiring color selection.

1.6 INFORMATIONAL SUBMITTALS

A. Product Test Reports for Laboratory Fume Hoods: Showing compliance with specified performance requirements for as-manufactured containment and static pressure loss, based on

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evaluation of comprehensive tests performed by manufacturer and witnessed by a qualified testing agency, for each type and size of fume hood.

B. Product Test Reports for Chemical Resistant Finish System: Based on evaluation of comprehensive tests performed by a qualified testing agency, indicating compliance of chemical resistant finish system with requirements of specified product standard.

C. Product Test Reports for Laboratory Fume Hood Work Top Materials: Based on evaluation of comprehensive tests performed by a qualified testing agency, indicating compliance of work top materials with requirements specified for chemical resistance.

D. Source quality control reports.

E. Field quality control reports.

1.7 CLOSE-OUT SUBMITTALS

A. Operation and maintenance data.

1.8 PROJECT CONDITIONS

A. Environmental Limitations: Do not deliver or install laboratory fume hoods until building is enclosed, wet work is complete, and HVAC system is operating and maintaining temperature and relative humidity at occupancy levels during remainder of construction period.

B. Field Measurement: Verify actual dimensions of openings and construction contiguous with laboratory casework by field measurements before fabrication.

1. Establish Dimensions: Where field measurements cannot be made without delaying the

Work, establish dimensions and proceed with fabrication without field measurements.

Coordinate construction to ensure that actual dimensions correspond to established dimensions. Allow for trimming and fitting.

1.9 EXTRA MATERIALS

A. Furnish complete touchup kit for each type and color of laboratory fume hood materials provided. Include fillers, primers, paints, stains, finishes, and other materials necessary to perform permanent repairs to damaged laboratory fume hood finishes.

PART 2 - PRODUCTS

2.1 MANUFACTURERS

A. Manufacturers: Subject to compliance with requirements, provide products by one of the following:

1. Air-Master Systems Corporation.

2. Bedcolab Ltd.

3. Institutional Casework, Inc.; Jamestown Metal Products.

4. Kewaunee Scientific Corporation.

5. Labconco Corporation.

6. Mott Manufacturing Ltd.

B. Source Limitations: Obtain laboratory fume hoods from single source from single manufacturer, unless otherwise indicated.

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1. Obtain laboratory under-counter corrosives storage cabinet, work top and base stand through same source and same manufacturer as fume hood manufacturer.

C. Product Designations: Drawings indicate sizes, types, and configurations of fume hoods by referencing designated manufacturer's catalog numbers. Other manufacturers' fume hoods of similar sizes, types, and configurations, and complying with the Specifications, may be considered. See Section016000 "Product Requirements."

2.2 PERFORMANCE REQUIREMENTS

A. Containment: Provide fume hoods that comply with the following when tested according to

ASHRAE110-2016, as modified below at a release rate of 4.0 L/min:

1. As-Manufactured (AM) Rating: AM0.05 (0.05 ppm).

2. As-Installed (AI) Rating: AI 0.10 (0.10 ppm).

3. Average Face Velocity – Vertical Rising Sash (CAV Exhaust): 100 fpm (0.51m/s) plus or minus 10 percent with sashes fully open.

4. Face-Velocity Variation: Not more than 10 percent of average face velocity across the face opening with sashes fully open.

B. Static-Pressure Loss: Not more than 1/2-inch wg (124 Pa) at 100-fpm (0.51-m/s) face velocity with sash fully open when measured at four locations 90 degrees apart around the exhaust duct and at least three duct diameters downstream from duct collar.

2.3 FUME HOODS

A. Product Standards: Comply with SEFA1, "Laboratory Fume Hoods - Recommended Practices."

Provide fume hoods UL listed and labeled for compliance with UL1805.

B. Bypass (CAV - Constant Air Volume) Fume Hoods: Provide bypass fume hoods. Compensating bypass above the sash opens as sash is closed. Provide sufficient bypass capacity so that face velocity with sash opening of 6 inches does not exceed 3 times the face velocity with sash fully open.

C. Ventilation Rate: Fume hoods shall be designed to operate at nominal face velocities, total exhaust rates (CFM) and containment requirements indicated. Refer to Mechanical drawings for maximum allowable fume hood exhaust ventilation rates.

2.4 MATERIALS

A. Steel Sheet: Cold-rolled, commercial steel (CS) sheet, complying with ASTMA1008/A1008M;

matte finish; suitable for exposed applications.

B. Stainless-Steel Sheet: ASTMA240/A240M or ASTMA666, Type304, stretcher-leveled standard of flatness.

C. Glass-Fiber-Reinforced Polyester: Polyester laminate with a chemical-resistant gel coat on exposed faces and having a flame-spread index of 25 or less according to ASTME84.

D. Glass: Clear tempered safety glass complying with ASTM C 1048, Kind FT, Condition A, Type

I, Class I, Quality Q3; not less than 0.2 inch thick.

1. Permanently mark safety glass with certification label of the SGCC or another certification agency acceptable to authorities having jurisdiction. Label shall indicate manufacturer's name, type of glass, thickness, and safety glazing standard with which glass complies.

E. Electrical Components, Devices, and Accessories: Listed and labeled as defined in NFPA70, by a qualified testing agency, and marked for intended location and application.

F. Fasteners: Provide stainless-steel fasteners where exposed to fumes.

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2.5 FABRICATION

A. General: Assemble fume hoods in factory to greatest extent possible. Disassemble fume hoods only as necessary for shipping and handling limitations. Fume hoods shall be capable of being partly disassembled as necessary to permit movement through a 35-by-79-inch (889-by-2007-

mm) door opening.

B. Steel Exterior: Fabricate from steel sheet, 0.048 inch/ 18 gauge thick, with component parts screwed together to allow removal of end panels, front fascia, and airfoil and to allow access to plumbing lines and service fittings. Apply chemical-resistant finish to interior and exterior surfaces of component parts before assembly.

C. Ends: Fabricate with double-wall end panels without projecting corner posts or other obstructions to interfere with smooth, even airflow. Close area between double walls at front of fume hood and as needed to house sash counterbalance weights, utility lines, and remote-control valves.

D. Splay top and sides of face opening to provide an aerodynamic shape to ensure smooth, even flow of air into fume hood.

E. Interior Lining: Provide the following unless otherwise indicated:

1. Glass-fiber-reinforced polyester, not less than 3/16 inch thick.

F. Lining Assembly: Unless otherwise indicated, assemble with stainless-steel fasteners or epoxy adhesive, concealed where possible. Seal joints by filling with chemical-resistant sealant during assembly.

1. Fasten lining components together with stainless-steel cleats or angles to form a rigid assembly to which exterior panels are attached.

2. Punch fume hood lining side panels to receive service fittings and remote controls.

Provide removable plug buttons for holes not used for indicated fittings.

3. Interior Access Panels: Provide interior gasketed access panels at end wall panels of fume hoods for access to end wall utility services, unless otherwise required by manufacturer for special purpose hood type conditions.

G. Rear Baffle: Unless otherwise indicated, provide baffle, of same material as fume hood lining, at rear of hood with openings at top and bottom. Secure baffle to cleats at rear of hood with stainless-steel screws. Fabricate baffle for easy removal for cleaning behind baffle.

1. Provide preset baffles.

2. Provide baffle materials with smooth edges and opening.

3. Provide adjustable baffles with remote-control adjustment from outside front of fume hood where indicated.

4. Provide epoxy-coated, stainless-steel screen at bottom baffle opening to prevent paper from being drawn into the exhaust plenum behind baffles.

H. Exhaust Plenum: Full width of fume hood and with adequate volume to provide uniform airflow from hood, of same material as hood lining, and with duct stub for exhaust connection.

1. Duct-Stub Material: Type 316L stainless steel with chemical-resistant finish.

I. Bypass Grilles: Provide grilles at bypass openings of fume hoods.

J. Sashes: Provide operable sashes of type indicated.

1. Fume hood sash shall be full view type with unobstructed, side-to-side view of fume hood interior.

2. Vertical Rising Sash: Fabricate from 0.050-inch- (1.27-mm-) thick stainless steel. Form into four-sided frame with bottom corners welded and finished smooth. Make top member removable for glazing replacement. Set glazing in chemical-resistant, U-shaped gaskets.

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Bottom rail shall be an integral, formed, full width, flush pull, and shall be anchored on each side to sash counterbalance system at bottom. Provide rubber bumpers at top and bottom of each sash unit.

3. Counterbalance vertical-sliding sash with single weight and chain and ball-bearing sprocket system to hold sash in place regardless of position. Rear sprockets shall be connected by a timing shaft to prevent sash tilting. Design system to hold sash at any position without creep and to prevent sash drop in the event of chain failure.

4. Glaze sash with tempered safety glass, unless otherwise indicated.

5. Sash Opening Height: Provide the following clear sash opening, measured from top of work surface to bottom of sash in full-open position.

a. Bench-Top Fume Hoods: 27 to 30 inches (685 to 762 mm), unless otherwise indicated.

6. Bench-Top Fume Hood View Opening Height: Provide clear view opening height, measured from top of work surface to bottom of header panel above sash opening of not less than 36 inches, unless otherwise indicated.

K. Airfoil: Unless otherwise indicated, provide airfoil at bottom of fume hood face opening with 1-inch (25-mm) space between airfoil and work top. Sash closes on top of airfoil, leaving 1-inch

(25-mm) opening for air intake. Airfoil directs airflow across work top to remove heavier-than-air gases and to prevent reverse airflow.

1. Fabricate airfoil from cold rolled steel with chemical resistant finish. Provide airfoil with cord-keeper slots each end to allow sash to close completely when electrical cords from equipment inside the hood are plugged into receptacles located on the hood corner posts.

L. LED Light Fixtures: Provide vaporproof, high-efficiency, quick-start, LED lighting system, including lamps at each fume hood. Shield lighting system from hood interior with 1/4-inch-

(6.35-mm-) thick laminated glass or 3-mm-thick tempered glass, sealed into hood with chemical-resistant rubber gaskets. Provide units with LED lighting system easily replaceable from outside of fume hood.

1. Provide LED lighting system with color temperature of 4000K and minimum color rendering index of 85.

2. 4 Foot Hoods: 2 each, 36 inch 11-watt LED lamps.

M. Filler Strips: Provide as needed to close spaces between fume hoods and adjacent building construction. Fabricate from same material and with same finish as fume hoods.

N. Comply with requirements in other Sections for installing water and laboratory gas service fittings, piping, electrical devices, and wiring. Install according to Shop Drawings. Securely anchor fittings, piping, and conduit to fume hoods unless otherwise indicated.

1. Pre-Wiring: Fume hoods shall be pre-wired to an accessible junction box(s) on top of fume hood. Refer to Division 26 Sections for wiring, conduit and box materials.

a. Provide separate circuits for each side of fume hood sash opening; each side rated at

20 amps. Combine fume hood lighting with circuit on one side of sash opening

(Contractor’s choice).

b. Provide light switch at fume hood sash opening per manufacturer.

2.6 FUME HOOD BASE CABINETS, BASE STANDS, WORK TOPS, SINKS AND SERVICE FITTINGS

A. Under-Counter Corrosives Storage Cabinet:

1. Dimensions: 28-3/4" High x 22" Deep x 12" Wide

2. Cabinet Material and Design: Metal laboratory casework with inset doors.

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3. Cabinet Construction: Comply with requirements for metal laboratory casework and the following:

a. Cabinet Use: Storage of acids and bases.

b. Cabinet Lining: Chemical resistant polyethylene lining, top, bottom, sides, back, and inside of cabinet doors; minimum [1] inch high lip at front cabinet opening; cabinet lining shall be liquid tight to minimum depth of [1] inch.

4. Cabinet Door Hardware: Hinged doors with pulls, keyed lock and catches; fasteners, shelf supports and other exposed hardware items within cabinet shall be corrosion resistant materials, compatible with materials being stored.

5. Cabinet Back: Provide removable back panels for access to utility chase from inside cabinet.

6. Shelves: Provide one full-depth shelf with polyethylene or polyolefin spill tray with [1] inch high raised lip four sides of each shelf.

7. Cabinet Ventilation: Provide [2] inch diameter polypropylene or polyolefin threaded vent pipe outlet(s) with sealed pipe joints. Secure vent outlets to back of cabinet with locking nut and seal to back panel. PVC piping is not acceptable.

a. Cabinets Ventilated Through Fume Hoods: Provide [2] inch diameter polyethylene or polyolefin vent pipe up to rear of fume hood located above cabinet. Coordinate pipe opening size and location in fume hood work top with Division 11 Section “Laboratory

Fume Hood.” Extend vent pipe assembly [4] inch above fume hood work top and behind rear baffle.

8. Identification: Storage cabinet shall be identified with conspicuous, minimum [2] inch high capital lettering to identify the material being stored (e.g. CORROSIVES-ACIDS, CORROSIVES-BASES, and other materials as indicated on Drawings).

B. Fume Hood Base Stands: Welded steel tubing legs, not less than 2 inches square with channel stretchers and aprons. Weld or bolt stretchers to legs and cross-stretchers, and bolt legs to aprons. Provide leveling device welded to bottom of each leg.

1. Dimensions: width and depth of base stand to accommodate dimensions of fume hood, must be adjustable in height to meet ADA height requirement that work surface is maximum of 34" above finished floor.

2. Knee Space: Provide clear floor space not less than 30 inches wide by 25 inches deep by

27 inches high within fume hood base stands unless otherwise indicated.

3. Provide removable closure panels to enclosed under-counter plumbing services.

C. Work Tops: Epoxy Resin

1. Bench Top Fume Hood Work-Top Configuration: Raised (marine) edge, 1-1/4 inch thick at raised edge, with beveled edge and corners. Raised front edge of work surface shall extend no more than 2-1/2 inch from inside face of sash.

2. Where corrosive storage or other special purpose storage cabinets occur below fume hoods and are indicated to be vented into fume hood chamber, provide work top opening through back of raised edge of work surface for vent tubing from cabinet up into fume hood chamber behind rear baffle.

D. Service Fittings:

1. Electrical Service Fittings: Provide UL listed units with metal housings, accessories and gaskets required for mounting in laboratory fume hoods.

a. Receptacles: Hospital grade, 120V GFCI devices, duplex type NEMA 5-20R, unless otherwise indicated, with indicator light that is lighted when device is tripped.

b. Light Switches: Single pole type.

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c. Receptacle and Switch Colors: Comply with requirements specified in Division 26

Sections, unless otherwise indicated or required by NFPA 70.

d. Cover Plates: Provide Type 304 stainless steel, satin finish cover plates with formed and beveled edges.

e. Cover Plate Identification: Comply with requirements specified in Division 26

Sections.

2.7 METAL FINISH

A. Preparation: Clean surfaces of mill scale, rust, oil, and other contaminants. After cleaning, apply a conversion coating suited to the organic coating to be applied over it.

B. Prepare, treat and finish welded assemblies after assembling. Prepare, treat and finish components that are mechanically fastened before assembly. Prepare, treat and finish concealed surfaces same as exposed surfaces.

C. Chemical-Resistant Finish: Immediately after cleaning and pretreating, apply fume hood manufacturer's standard two-coat, chemical-resistant, baked-on finish consisting of prime coat and thermosetting topcoat. Comply with coating manufacturer's written instructions for applying and baking to achieve a minimum dry film thickness of 2 mils.

1. Chemical and Physical Resistance of Finish System: Finish shall comply with acceptance levels of cabinet surface finish tests in SEFA8M. Acceptance level for chemical spot test shall be no more than four Level3 conditions and results shall be within the range indicated for each chemical reagent.

2. Colors for Fume Hood Finish: As selected by Architect from manufacturer's full range.

3. Colors for Fume Hood Base Cabinet Finish: Match fume hood exterior finish.

2.8 ACCESSORIES

A. Fume Hood Air Flow Controller, Alarm and Sash Position Sensor: Controller, alarm and sash position sensor to be provided by Division 23 Section for field installation. Provide fume hood with factory cutouts and brackets for controller and accessories.

B. Airflow Indicator and Alarm: Provide each fume hood with manufacturer's standard airflow indicator with audible and visual alarm that activates when airflow sensor reading is outside of preset range.

1. Indicator Type: Thermal anemometer that measures fume hood face velocity and displays data as digital readout.

2. Provide with thermal-anemometer airflow sensor.

3. Provide with reset and test switches.

4. Provide with switch that silences audible alarm and automatically resets when airflow returns to within preset range.

C. Sash Stops: Provide fume hoods with sash stops to limit hood opening to sash operating height of 18 inches, unless otherwise indicated. Sash stops can be manually released to open sash fully for cleaning fume hood and for placing large apparatus within fume hood.

1. Provide sash stop at full-open sash position to assist with loading/unloading.

2. Accessible Fume Hoods: Provide additional sash stop at nominal 14 inches high sash operating positions. Coordinate final location of the additional sash stop to limit vertical reach required to close sash to no more than 48 inches above finish floor.

D. Labels: Fume- and reagent-resistant plastic material, identifying operating height and face velocity, and hood safety practices.

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E. Bypass Grille Blank-off Panel: Provide fume hoods with blank-off panel on bypass grille designed for use with sash stops to reduce exhaust air volume and provide design face velocity with sash at operating height indicated.

2.9 SOURCE QUALITY-CONTROL

A. Demonstrate fume hood performance before shipment by testing fume hoods according to to

ASHRAE 110 as modified in “Performance Requirements Article. Provide testing facility, instruments, equipment, and materials needed for tests.

B. Prepare test reports.

PART 3 - EXECUTION

3.1 INSTALLATION

A. General: Install fume hoods according to manufacturer's written instructions. Install level, plumb, and true; shim as required, using concealed shims, and securely anchor to building and adjacent laboratory casework. Securely attach access panels but provide for easy removal and secure reattachment. Where fume hoods abut other finished work, apply filler strips and scribe for accurate fit, with fasteners concealed where practical.

1. Seal joint between work top and fume hood structure with sealant recommended by manufacturer of fume hood and work top materials.

B. Comply with requirements in Division 26 Sections for installing electrical devices.

1. Install fittings according to Shop Drawings, installation requirements in SEFA2, and manufacturer's written instructions. Securely anchor fittings to fume hoods unless otherwise indicated.

3.2 FIELD QUALITY CONTROL

A. Testing Agency: Engage a qualified testing agency to perform tests and inspections.

B. Manufacturer’s Field Service: Engage a factory-authorized service representative to inspect components, assemblies, and equipment installations, including connections and to assist in testing.

C. Field test installed fume hoods according to ASHRAE110 as modified in “Performance

Requirements” Article to verify compliance with performance requirements.

1. Adjust fume hoods, hood exhaust fans, and building's HVAC system, or replace hoods and make other corrections until tested hoods perform as specified.

2. After making corrections, retest fume hoods that failed to perform as specified.

D. Coordinate field testing of fume hoods with requirements of Division 23 Section “Testing, Adjusting and Balancing.”

E. Prepare test and inspection reports.

3.3 ADJUSTING AND CLEANING

A. Adjust moving parts for smooth, near silent, accurate sash operation with one hand. Adjust sashes for uniform contact of rubber bumpers. Verify that counterbalances operate without interference.

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B. Clean finished surfaces, including both sides of glass; touch up as required; and remove or refinish damaged or soiled areas to match original factory finish, as approved by Architect.

C. Occupancy Adjustments: When requested within 12 months of date of Substantial Completion, provide on-site assistance in adjusting fume hoods to suit actual occupied conditions. Provide up to two visits to Project during other-than-normal occupancy hours for this purpose.

3.4 DEMONSTRATION

A. Engage a factory-authorized service representative to train Owner's maintenance personnel to adjust, operate, and maintain laboratory fume hoods.

END OF SECTION 11 5313