233423-RIB-HVAC Power Ventilators-12-24-2025.pdf

25-388 CBI HVAC and Lighting Upgrade 233423 - 1 HVAC Power Ventilators

SECTION 233423

HVAC POWER VENTILATORS

PART 1 GENERAL

1.01 SECTION INCLUDES

A. Roof exhausters.

B. Roof ventilators.

C. Wall exhausters.

D. Cabinet exhaust fans.

E. Ceiling exhaust fans.

F. Fire-rated enclosures.

G. Upblast roof exhausters.

H. Inline centrifugal fans and blowers.

I. Kitchen hood upblast roof exhausters.

J. Utility vent blower sets.

K. Laboratory-fume exhaust fans.

1.02 RELATED REQUIREMENTS

A. Section 230513 - Common Motor Requirements for HVAC Equipment.

B. Section 230548 - Vibration and Seismic Controls for HVAC.

C. Section 233300 - Air Duct Accessories: Backdraft dampers.

D. Section 260583 - Wiring Connections: Electrical characteristics and wiring connections.

1.03 REFERENCE STANDARDS

A. AMCA (DIR) - (Directory of) Products Licensed Under AMCA International Certified Ratings

Program; 2015.

B. AMCA 99 - Standards Handbook; 2025.

C. AMCA 204 - Balance Quality and Vibration Levels for Fans; 2020.

D. AMCA 210 - Laboratory Methods of Testing Fans for Certified Aerodynamic Performance

Rating; 2025.

E. AMCA 300 - Reverberation Room Methods of Sound Testing of Fans; 2024.

F. AMCA 301 - Methods for Calculating Fan Sound Ratings from Laboratory Test Data; 2022.

G. NEMA EN 10250 - Enclosures for Electrical Equipment (1000 Volts Maximum); 2024.

H. NFPA 96 - Standard for Ventilation Control and Fire Protection of Commercial Cooking

Operations; 2024.

I. UL 762 - Outline of Investigation for Power Roof Ventilators for Restaurant Exhaust Appliances;

Current Edition, Including All Revisions.

1.04 ADMINISTRATIVE REQUIREMENTS

A. Preinstallation Meeting: Conduct a preinstallation meeting one week prior to the start of the work of this section; require attendance by all affected installers.

B. Sequencing: Ensure that utility connections are completed in an orderly and expeditious manner.

1.05 SUBMITTALS

A. See Section 013000 - Administrative Requirements for submittal procedures.

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B. Product Data: Provide data on fans and accessories, including fan curves with specified operating point plotted, power, rpm, sound power levels at rated capacity, and electrical characteristics and connection requirements.

C. Manufacturer's Instructions: Indicate installation instructions.

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

1.06 QUALITY ASSURANCE

A. Manufacturer Qualifications: Company specializing in manufacturing the type of products specified in this section, with minimum three years of documented experience.

1.07 FIELD CONDITIONS

A. Request Owner permission to use permanent ventilator(s) for ventilation during construction.

PART 2 PRODUCTS

2.01 MANUFACTURERS

A. Greenheck Fan Corporation; ______: www.greenheck.com/#sle.

B. Loren Cook Company; ______: www.lorencook.com/#sle.

C. PennBarry, Division of Air System Components; ______: www.pennbarry.com/#sle.

D. Twin City Fan & Blower; ______: www.tcf.com/#sle.

E. Substitutions: See Section 016000 - Product Requirements.

2.02 POWER VENTILATORS - GENERAL

A. Static and Dynamically Balanced: Comply with AMCA 204.

B. Performance Ratings: Comply with AMCA 210, bearing certified rating seal.

C. Sound Ratings: Comply with AMCA 301, tested to AMCA 300, bearing certified sound ratings seal.

D. Fabrication: Comply with AMCA 99.

E. Electrical Components: Listed and classified by Underwriters Laboratories Inc. as suitable for the purpose specified and indicated.

2.03 ROOF VENTILATORS

A. Fan Unit: V-belt or direct driven as indicated, with spun aluminum housing; resilient mounted motor; 1/2 inch mesh, 0.62 inch thick aluminum wire birdscreen; square base to suit roof curb with continuous curb gaskets.

B. Roof Curb: 8 inch high self-flashing of galvanized steel with continuously welded seams, built-in cant strips.

C. Disconnect Switch: Factory wired, non-fusible, in housing for thermal overload protected motor and wall mounted multiple speed switch or solid state speed controller.

D. Backdraft Damper: Gravity actuated, aluminum multiple blade construction, felt edged with offset hinge pin, nylon bearings, blades linked, and line voltage motor drive, power open, spring return.

E. Sheaves: Cast iron or steel, dynamically balanced, bored to fit shafts and keyed; variable and adjustable pitch motor sheave selected so required rpm gets attained with sheaves set at mid-position; fan shaft with self-aligning pre-lubricated ball bearings.

2.04 WALL EXHAUSTERS

A. Fan Unit: V-belt or direct driven with spun aluminum housing; resiliently mounted motor; 1/2 inch mesh, 0.062 inch thick aluminum wire bird screen.

B. Disconnect Switch: Factory wired, nonfusible, in housing for thermal overload protected motor, and wall mounted multiple speed switch.

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C. Backdraft Damper: Gravity actuated, aluminum multiple blade construction, felt edged with offset hinge pin, nylon bearings, blades linked, and line voltage motor drive, power open, spring return.

D. Sheaves: For V-belt drives, provide cast iron or steel, dynamically balanced, bored to fit shafts and keyed; variable and adjustable pitch motor sheaves selected so required rpm can be reached with sheaves set at mid-position; fan shaft with self-aligning prelubricated ball bearings.

2.05 CABINET EXHAUST FANS

A. Centrifugal Fan Unit: V-belt or direct driven with galvanized steel housing lined with acoustic insulation, resiliently mounted motor, gravity backdraft damper in discharge.

B. Disconnect Switch: Cord and plug in housing for thermal overload protected motor and wall mounted solid state speed controller.

C. Grille: Molded white plastic.

D. Sheaves: Cast iron or steel, dynamically balanced, bored to fit shafts and keyed; variable and adjustable pitch motor sheaves selected so required rpm is reached with sheaves set at mid-position; fan shaft with self-aligning pre-lubricated ball bearings.

2.06 FIRE-RATED ENCLOSURES

A. Manufacturers:

1. Fire Rated Product Specialties Corp: www.frpsonline.com/#sle.

2. Substitutions: See Section 016000 - Product Requirements.

B. Provide as required to preserve the fire-resistance rating of building elements.

2.07 UPBLAST ROOF EXHAUSTERS

A. Shafts and Bearings:

1. Fan Shaft:

a. Ground and polished steel with anti-corrosive coating.

b. First critical speed at least 25 percent over maximum cataloged operating speed.

2. Bearings:

a. Permanently sealed or pillow block type.

b. Minimum L10 life in excess of 100,000 hours (equivalent to L50 average life of

500,000 hours), at maximum cataloged operating speed.

c. 100 percent factory tested.

B. Drive Assembly:

1. Belts, pulleys, and keys oversized for a minimum of 150 percent of driven horsepower.

2. Belts: Static free and oil resistant.

3. Fully machined cast iron type, keyed and securely attached to the wheel and motor shafts.

4. Motor pulley adjustable for final system balancing.

5. Readily accessible for maintenance.

C. Disconnect Switches:

1. Factory mounted and wired.

2. Environment Type per NEMA EN 10250: Unless otherwise indicated, as specified for the following installation locations:

a. Indoor Clean, Dry Locations: Type 1.

b. Outdoor Locations: Type 3R.

3. Positive electrical shutoff.

4. Wired from fan motor to junction box installed within motor compartment.

D. Roof Curb: 8 inch high self-flashing of galvanized steel with continuously welded seams, built-in cant strips, insulation and curb bottom, curb bottom, ventilated double wall, and factory installed nailer strip.

E. Drain Trough: Allows for single-point drainage of water, grease, and other residues.

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F. Options/Accessories:

1. Automatic Belt Tensioner: Automatic device that adjusts for correct belt tension for single drives.

2. Birdscreen:

a. Provide galvanized steel construction.

b. Protects fan discharge.

3. Clean Out Port: Removable grease repellent compression rubber plug allows access for cleaning wheel through windband.

4. Dampers: Provide motorized type.

5. Drain Connection:

a. Aluminum construction.

b. Allows single-point drainage of grease, water, or other residues.

6. Finishes: Factory primed.

7. Hinge Kit:

a. Aluminum hinges.

b. Hinges and restraint cables mounted to base (sleeve).

c. Allows fan to tilt away for access to wheel and ductwork for inspection and cleaning.

8. Heat Baffle: Prevents heat from radiating into motor compartment.

9. Tie-down Points: Four brackets located on windband secures fan in heavy wind applications.

2.08 INLINE CENTRIFUGAL FANS AND BLOWERS

A. Centrifugal Fan Unit: V-belt or direct driven, with galvanized steel housing lined with acoustic insulation, resiliently-mounted motor, gravity backdraft damper in discharge.

B. Disconnect Switch: Cord and plug-in housing for thermal overload protected motor and wall mounted switch.

C. Sheaves: Cast iron or steel, dynamically balanced, bored to fit shafts and keyed; variable and adjustable pitch motor sheaves selected so required rpm gets reached with sheaves set at mid-position; fan shaft with self-aligning prelubricated ball bearings.

2.09 KITCHEN HOOD UPBLAST ROOF EXHAUSTERS

A. Belt Drive Fan:

1. Fan Wheel:

a. Type: Non-overloading, backward inclined centrifugal.

b. Material: Aluminum, statically and dynamically balanced.

2. Housing:

a. Construct of heavy gauge aluminum including curb cap, windband, and motor compartment.

b. Rigid internal support structure.

c. One-piece fabricated or fully welded curb-cap base to windband for leak proof construction.

d. Construct drive frame assembly of heavy gauge steel, mounted on vibration isolators.

e. Provide breather tube for fresh air motor cooling and wiring.

B. Shafts and Bearings:

1. Fan Shaft:

a. Ground and polished steel with anti-corrosive coating.

b. First critical speed at least 25 percent over maximum cataloged operating speed.

2. Bearings:

a. Permanently sealed or pillow block type.

b. Minimum L10 life in excess of 100,000 hours (equivalent to L50 average life of

500,000 hours), at maximum cataloged operating speed.

c. 100 percent factory tested.

C. Drive Assembly:

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1. Belts, pulleys, and keys oversized for a minimum of 150 percent of driven horsepower.

2. Belts: Static free and oil resistant.

3. Fully machined cast iron type, keyed and securely attached to the wheel and motor shafts.

4. Motor pulley adjustable for final system balancing.

5. Readily accessible for maintenance.

D. Disconnect Switches:

1. Factory mounted and wired.

2. Environment Type per NEMA EN 10250: Unless otherwise indicated, as specified for the following installation locations:

a. Indoor Clean, Dry Locations: Type 1.

b. Outdoor Locations: Type 3R.

3. Positive electrical shutoff.

4. Wired from fan motor to junction box installed within motor compartment.

E. Roof Curb: {CH#100939} high{CH#100940} of {CH#100941} with continuously welded seams, {CH#100942}.

F. Drain Trough: Allows for single-point drainage of water, grease, and other residues.

G. Options/Accessories:

1. Automatic Belt Tensioner: Automatic device that adjusts for correct belt tension for single drives.

2. Birdscreen:

a. Provide galvanized steel construction.

b. Protects fan discharge.

3. Clean Out Port: Removable grease repellent compression rubber plug allows access for cleaning wheel through windband.

4. Roof Curb Extension: Vented curb extension where required for compliance with minimum clearances required by NFPA 96.

5. Drain Connection:

a. Aluminum construction.

b. Container allows single-point drainage of grease, water, or other residues.

6. Finishes: Factory primed.

7. Grease Trap:

a. Aluminum.

b. Built-in drain connection.

c. Container system to collect grease residue.

8. Hinge Kit:

a. Aluminum hinges.

b. Hinges and restraint cables mounted to base sleeve.

c. Allows fan to tilt away for access to wheel and ductwork for inspection and cleaning.

9. Heat Baffle: Prevents heat from radiating into motor compartment.

10. Tie-down Points: Four brackets located on windband secures fan in heavy wind applications.

11. External motor speed controllers for field mounting.

2.10 LABORATORY FUME-EXHAUST FANS

A. Application:

B. Fan Section Requirements:

1. Impeller:

a. Non-overloading, backward-inclined centrifugal.

b. Material: Aluminum.

2. Fan Shaft:

a. Ground and polished steel with anticorrosive coating.

b. First critical speed at least 25 percent over maximum cataloged operating speed.

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c. Enclosed over OSHA recommended safety-yellow painted guards.

3. Bearings:

a. 100 percent factory tested surface-mounted bearings outside of the airstream.

b. Operate during a minimum L10 service life in excess of 100,000 hours at maximum cataloged operating speed.

4. Belt-drive Assembly:

a. Belts, pulleys, and keys oversized for a minimum of 150 percent of driven horsepower.

b. Belts: Static-free and oil resistant.

c. Fully machined cast iron type, keyed and securely attached to the wheel and motor shafts.

d. Motor pulley adjustable for final system balancing, readily accessible for maintenance.

5. Housing:

a. Construct of heavy gauge aluminum with standard factory finish.

b. Mounting Base:

c. Construct drive frame assembly of heavy gauge steel, mounted on vibration isolators.

d. Provide breather tube for fresh air motor cooling and wiring.

e. Minimum Assembly Height: 120 inches above the roof surface.

6. Isolation Damper:

a. With parallel blade damper, constructed of matching materials and finish.

b. Provided by manufacturer, bolted to access drawer or panel for easy removal from contaminated airstream.

c. With two-position damper actuator:

1) Provided by manufacturer.

2) Operate interlocked with fan starter.

3) With integral auxiliary switches to monitor blade position status.

4) Rated for NEMA EN 10250, Type 4 (IP66) environment within protective weather-housing out of contaminated airstream, connected through linkages.

7. Fan Discharge Outlet-Nozzle:

8. Fan Inlet Flow Sensor: Provide factory-mounted pitot tube-based differential pressure sensor probe ready for connection into differential pressure-based flow transmitter.

a. Transmitter Housing: Provide NEMA EN 10250, Type 4 enclosure.

C. Disconnect Switch:

1. Factory-mounted in NEMA EN 10250, Type 3R box wired in compliance with Section

260583.

D. Air-Mixing Plenum Box:

1. Continuously welded insulated box using assembly matching material and finish on both interior and exterior sides.

2. Provide factory-mounted box on heavy-duty roof curb with integral box-lifting lugs and skirt.

3. Include bolted and gasketed access panels for servicing and maintenance.

4. Locate exhaust intake opening on the bottom end fitted with matching duct connecting fitting and safety screen.

5. Locate fan inlet opening on the upper end fitted with matching assembly-base and flow straightener.

6. Air-bypass Intake:

a. With opposed blade damper, constructed of matching materials and finish.

b. With proportional damper actuator:

1) Provided by manufacturer.

2) Integral potentiometer to monitor blade position.

3) Rated for NEMA EN 10250, Type 4 (IP66) environment within protective weather-housing out of contaminated airstream, connected throughlinkages.

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c. Covered by damper enclosing weatherhood with intake birdscreen.

E. Roof Curbs:

1. 12 inch high flanged, self-flashing of matching material and finish with continuously welded seams.

2. Provide integral formed steel support framework with curb cap guides.

PART 3 EXECUTION

3.01 INSTALLATION

A. Install in accordance with manufacturer's instructions.

B. Secure roof exhausters with cadmium plated steel lag screws to roof curb.

C. Extend ducts to roof exhausters into roof curb. Counterflash duct to roof opening.

D. Hung Cabinet Fans:

1. Install fans with resilient mountings and flexible electrical leads, see Section 230548.

2. Install flexible connections between fan and ductwork; see Section 233300. Ensure metal bands of connectors are parallel with minimum 1 inch flex between ductwork and fan while running.

E. Provide sheaves required for final air balance.

F. Install backdraft dampers on inlet to roof and wall exhausters.

G. Provide backdraft dampers on outlet from cabinet and ceiling exhauster fans and as indicated.

END OF SECTION

233423 - HVAC Power Ventilators