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MPS Master SECTION 23 34 00

HVAC FANS

PART - GENERAL

SUMMARY

Section Includes: Include labor, materials, equipment, and accessories to furnish and install fans with related connections shown on Drawings.

SUBMITTALS

Shop Drawings: Submit a portfolio showing supply, return, and exhaust fan units to be used, indicating service to be performed for approval by Architect/Engineer.

QUALITY ASSURANCE

Regulatory Requirements:

State Building CodeLocal Codes and OrdinancesLocal Authority having jurisdiction

PART - PRODUCTS

MANUFACTURERS

Acceptable Manufacturers for Spun Aluminum Power Roof Exhaust Fans - Direct Drive: Subject to compliance with requirements of the Contract Documents, acceptable manufacturers are as follows:

CookGreenheck

Acceptable Manufacturers for Spun Aluminum Power Roof Exhaust Fans - Belt Drive: Subject to compliance with requirements of the Contract Documents, acceptable manufacturers are as follows:

CookGreenheck

Acceptable Manufacturers for Up-Blast Centrifugal Roof Exhausters: Subject to compliance with requirements of the Contract Documents, acceptable manufacturers are as follows:

GreenheckCook

Acceptable Manufacturers for Belt Driven Kitchen Hood Exhaust Fan: Subject to compliance with requirements of the Contract Documents, acceptable manufacturers are as follows:

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GreenheckCook

Acceptable Manufacturers for Belt Driven Centrifugal Inline Fans: Subject to compliance with requirements of the Contract Documents, acceptable manufacturers are as follows:

CookGreenheck

Acceptable Manufacturers for Airfoil Axial Fans: Subject to compliance with requirements of the Contract Documents, acceptable manufacturers are as follows:

TraneTwin City/AeroventBarry Blower

Acceptable Manufacturers for Small Cabinet Fan: Subject to compliance with requirements of the Contract Documents, acceptable manufacturers are as follows:

Penn Ventilator Company - Zepher ModelCookGreenheckBroanTwin City/Aerovent

Acceptable Manufacturers for Utility Sets: Subject to compliance with requirements of the Contract Documents, acceptable manufacturers are as follows:

GreenheckTraneTwin City/Aerovent

Acceptable Manufacturers for Belt Driven Kitchen Hood Exhaust Fan (Utility Set): Subject to compliance with requirements of the Contract Documents, acceptable manufacturers are as follows:

PennGreenheckCookTwin City/Aerovent

Acceptable Manufacturers for Centrifugal Fans: Subject to compliance with requirements of the Contract Documents, acceptable manufacturers are as follows:

TraneBarryChampionTwin City/Aerovent

Acceptable Manufacturers for Propeller Fans - Belt Drive: Subject to

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compliance with requirements of the Contract Documents, acceptable manufacturers are as follows:

GreenheckCookTwin City/Aerovent

Acceptable Manufacturers for Mixed Flow Fans: Subject to compliance with requirements of the Contract Documents, acceptable manufacturers are as follows:

TraneChicago BlowerTwin City/AeroventCookGreenheck

Acceptable Manufacturers for Low Silhouette Propeller Power Relief Fans - Belt Drive: Subject to compliance with requirements of the Contract Documents, acceptable manufacturers are as follows:

GreenheckCookTwin City Fan

SPUN ALUMINUM POWER ROOF EXHAUST - DIRECT DRIVE

General Requirements: Direct drive power roof exhausters shall be UL listed fans and shall be statically and dynamically balanced in factory prior to shipping.

Housing: Fan housing shall be of heavy gauge spun aluminum construction with galvanized steel support members. Unit shall be weatherproof and shall incorporate an integral weather shield. Bird screen shall be factory applied over fan discharge openings.

Provide a factory applied bird screen, with 85 percent free area, over fan discharge openings.

Provide a backdraft damper in fan base.

Fans shall have an integral factory formed base and 1-piece spinnings without welding. Housings shall be provided with wiring channel and shall be of the direct discharge design.

Wheel: Fan wheel shall be of backwardly inclined, non-overload design with ball bearings supported by framework on rubber vibration isolators. Key statically and dynamically balanced wheel to drive shaft.

Motor: Direct drive units shall have extended drive shaft through the fan wheel. Mount motor on vibration isolated framework above fan wheel in fan housing for air cooling.

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Motors shall be ECM and have integral automatic thermal overload protection and integral speed controller.

Electrical: Motors for direct drive units shall be single phase, 120 volt, 60 Hertz, A.C. Furnish unit with a disconnect switch inside the fan housing and factory wired from disconnect switch to motor. Motor shall be supplied with a factory installed speed controller for each unit.

Roof Curb: Curb shall be fabricated of 18 gauge galvanized steel with liquid tight, continuously welded corner seams, prime coat, 1 1/2-inch wood nailer and 1 1/2-inch, 3-pound density rigid fiberglass insulation. Curb shall be straight cantless type with full metal liner. All curbs to have a 18” curb extension with factory access door, gravity back draft damper.

SPUN ALUMINUM POWER ROOF EXHAUST FANS - DIRECT DRIVE ONLY

General Requirements: Belt driven power roof exhausters shall be Underwriters' Laboratories listed fans, shall be rated based on tests made in accordance with AMCA Standard 210, and shall meet the requirements of certified AMCA ratings. Units shall be statically and dynamically balanced in factory prior to shipping.

Housing: Fan housing shall be of heavy gauge spun aluminum construction with galvanized steel support members. Unit shall be weatherproof and shall incorporate an integral weather shield. Bird screen shall be factory applied over fan discharge openings.

Provide a factory applied bird screen, with 85 percent free area, over fan discharge openings.


Fans shall integral factory formed base and 1-piece spinnings without welding. Housings shall be provided with wiring channel and shall be of the direct discharge design.

Wheel: Fan wheel shall be of the backwardly inclined, non-overload design, manufactured of sparkproof aluminum. Key wheel to anti-corrosion steel shaft supported by (2) prelubricated bearings attached to vibration isolated heavy steel framing, fan wheel, and motor support

Direct Drive Motor: ECM type having permanently lubricated ball bearings. Mount motor below drive.

Motor shall have integral automatic reset thermal overload protection.

On fans that have a variable frequency drive, provide factory mounted motor-shaft ground system and the motor shall be inverter duty type motor.

Electrical: See Section 23 05 13, Electrical Motor Schedule or the Equipment Schedule for voltage and rpm requirements. See Section 23 05 13 for motor minimum efficiency. Furnish unit with a disconnect switch inside fan housing,

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factory wired from disconnect switch to motor.


UPBLAST CENTRIFUGAL ROOF EXHAUSTERS

General Requirements: Belt driven upblast roof exhausters shall be Underwriters' Laboratories listed fans, shall be rated based on tests made in accordance with AMCA Standard 210, and shall meet the requirements of certified AMCA ratings. Units shall be statically and dynamically balanced in factory prior to shipping.

Housing: Fan housing shall be of galvanized steel or aluminum, low contour style construction; shall be completely weatherproofed; and shall be securely fastened to roof curb. Fan supporting framework shall be constructed of acrylized steel members. Bird screen shall be factory applied over fan discharge openings.

Finish: Furnish units with a factory applied coat of Rust-Oleum, or Owner approved equal, paint applied on either zinc chromate primed galvanized steel or acid etched aluminum.

Fans shall be weatherproof and include adequate drainage at bottom.


Wheel: Fan wheel shall have backwardly inclined, non-overloading aluminum wheels with integral cooling fans. Fan wheel shall be spark resistant and non-overloading.

Drive shaft shall be ground and polished steel and shall have a rust protective treatment.

Keyed, adjustable, pulleys shall be fixed with set screws.

Motors: Unit shall be furnished with a UL approved open drip proof motor of an energy efficient design. Motors shall be located out of the airstream. Motor shall have integral automatic reset thermal overload protection.

Refer to Section 23 05 13, Common Motor Requirements for HVAC Equipment, or the Equipment Schedule for voltage and rpm requirements. Refer to Section 23 05 13 for motor minimum efficiency.

Motor and drive assembly shall be cleaned with clean outside air.

Fan shall be furnished with a factory installed, weather tight, disconnect switch connected to motor with high temperature wire in flexible metal conduit.

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BELT DRIVEN CENTRIFUGAL INLINE FANS

General: Belt driven axial flow fans shall be as detailed on Drawings and specified. Capacity ratings shall be based upon tests performed in strict accordance with AMCA Standard 210 Test Code for air moving devices. Each fan shall carry near the manufacturer's nameplate the seal authorized by AMCA indicating that capacity ratings are certified. Fans not bearing this seal shall not be acceptable.

Tubular Housing: Each end of housing shall have connecting flanges for attachment of flexible connection and ductwork. Round fan casing shall be of 14 gauge aluminum with deep spun inlet venturi and discharge straightening vanes. Provide inlet or outlet screen when no ductwork connection is made to the fan.

Angle supports shall be fastened to the sides of the unit for horizontal suspension with rod hangers and isolators.

Contractor shall externally insulate housing to absorb sound and control condensation.

Wheel: True airfoil design with backward inclined, non-overloading blades of aluminum or tubular, welded steel, statically and dynamically balanced.

Motor and Drive: Motor shall be mounted on the exterior of unit housing with the shaft bearings encased within the fan tube. Motor shall have integral automatic reset thermal overload protection. Unit shall be provided with a fixed drive pulley for specified duty.

Contractor shall provide one additional drive pulley and installation labor. Performance rating shall be selected and second pulley shall be installed following system installation, running check and balance. Contractor shall retain drive pulley not used. Units shall be as specified.

Unit shall be provided with an OSHA approve belt guard.


Electrical: Refer to Section 23 05 13, Common Motor Requirements for HVAC Equipment, or the Equipment Schedule for voltage and rpm requirements. See Section 23 05 13 for motor minimum efficiency.

Unit shall be furnished with a disconnect switch installed on top of the fan housing, factory wired from the disconnect switch to the motor.

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AIRFOIL AXIAL FANS

General Requirements: Fans shall be UL listed fans, shall be rated based on tests made in accordance with AMCA Standards 210 and 300, shall meet the requirements of certified AMCA ratings and shall bear the AMCA Certified Rating Seal.

Fans shall be dynamically balanced to eliminate vibration and noise transmission to occupied areas. Variable air volume fans shall be balanced at (10) different fans speeds over the specified operating range.

Fan Wheel: Fan wheel shall be an aluminum single piece precision casting with (8) radially projected blades with air-foil cross section. Wheel shall be dynamically balanced and keyed to fan shaft.

Fan Housing: Housings shall be made of 14 gauge steel hydraulically expanded to form integral inlet bell and diffusers sections. Hydraulically expanded stiffing ring welded in area of wheel raceway. On VAV variable speed fan units, fan inlet supports shall be structurally reinforced to handle extra stresses of variable speed fan modulation. Provide inlet or outlet screen when no ductwork connection is made to the fan.

Fan shall have tapered inlet and outlet shells over fan hub assembly. Shells shall uniformly accelerate air through blade area. End bell covers drive assembly and shall thereby reduce flow turbulence. Blade to shell clearance shall be in the range of 30 mils.

Fan parts shall be painted with enamel primer prior to final assembly. Finish coat shall be executive beige enamel applied to the exterior surfaces after assembly.

Motors and Drives: Refer to Section 23 05 13, Common Motor Requirements for HVAC Equipment, or the Equipment Schedule for voltage and rpm requirements. Refer to Section 23 05 13 for motor minimum efficiency. Furnish unit with a disconnect switch inside fan housing, factory wired from disconnect switch to motor.

Bearings: Precision, flange mounted, self-aligning bearing shall be at the inlet and discharge. Bearings shall be grease lubricated and selected for a minimum average life (AFBMA L-10) in excess of 200,000 hours at maximum cataloged operating conditions. Bearing grease-lines shall be extended out through the fan shell and acoustical enclosure.

Shaft: Shaft shall be solid ANSI C1040 hot-rolled steel turned and polished. Close tolerances shall be maintained where shaft makes contact with bearings.

Factory Drives and Post-TABB Drives: A factory V-belt drive shall be fixed pitch rated at 1.5 times the motor nameplate. Drives 20 horsepower and larger, or any drives on units equipped with VFDs, shall be fixed pitch. V-Belt Drive: Cast iron or steel shall be computer selected for low noise, low maintenance

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operation. Center distance and arc of contact shall be maintained within prefixed limits. Constant speed fans shall use variable or constant pitch drives; variable speed modulated fans shall use fixed drives only. Drive selection shall be sized after preliminary TAB work has established unit preliminary cfm. No additional cost shall be incurred by Owner

Lubrication: Lubrications fittings shall be extended to outside of acoustical enclosure for ease of servicing.


Sound Attenuators:

When indicated in the schedule, the manufacturer shall provide a sound attenuator per the requirements of Section 23 33 00.

If manufacturer cannot obtain outlet sound power levels indicated, they shall provide sound attenuators. Supplier to include any additional cost if motor horsepower increases and the cost related to installing the additional sound attenuators.

KITCHEN HOOD EXHAUST FANS

Ratings:

Kitchen hood exhaust power roof ventilators shall be safety tested and listed by UL to operate continuously at 300 degrees F for the removal of smoke and grease laden vapors.

Kitchen exhaust power roof ventilator ratings shall be based upon tests performed in strict accordance with AMCA Standard 210 Test Code for air moving devices and shall carry the AMCA seal.

Housing: Heavy gauge steel, all-welded construction, rigidly supported with structural bracing. Removable rotor assembly shall allow access to wheel and ductwork for periodic cleaning. Removable weather cover shall provide access to fan motor and belt. A vertical discharge shall extend from the unit housing and shall discharge exhaust air high above the roof.

Unit housing shall receive (2) coats of UL approved epoxy primer with polyurethane enamel finish.

Galvanized steel vertical discharge hood and motor/drive cover shall be primed and shall receive (2) coats of rust resistant paint.

Motor/damper access panel shall be watertight.

Fan Wheel: Fan shall utilize a backward inclined, non-overloading centrifugal wheel. The precision formed wheel blades shall be welded to spun shrouds then statically and dynamically balanced prior to assembly.

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Unit shall be equipped with a spun inlet cone with close running clearance between cone and wheel to provide maximum efficiency.

Bearings: Fan shall be equipped with cast iron flange mounted, self-aligning ball bearings. Bearings shall be equipped with fittings for easy relubrication.

Fan Shaft: Fan shaft shall be precision ground for a precise fit.

Motors: Unit shall be furnished with a UL approved open drip proof motor of an energy efficient design. Motor shall have integral automatic reset thermal overload protection.

Refer to Section 23 05 13, Common Motor Requirements for HVAC Equipment, or the Equipment Schedule for voltage and rpm requirements. Refer to Section 23 05 13 for motor minimum efficiency. Motor and drive chamber shall be furnished with a heat shield to protect against heat transmitted and radiated from below.

Hinged motor assembly shall permit the motor to be mounted in any of (3) positions. Motor mounting plate shall be located with (2) hinged bolts to provide easy belt alignment and tension.

Unit shall be provided with a factory installed and wired disconnect switch.

On fans that have a variable frequency drive, provided factory mounted motor-shaft ground system and the motor shall be inverter duty type motor.

Drives: Unit shall be furnished with adjustable pitch drives to provide speed adjustment to meet each application. Drive shall be selected to have a 1.5 service factor.

NFPA 96 Compliance: Fan shall meet requirements of NFPA 96 to include, but not be limited to:

24-Inch High Roof CurbHinged Base with Retainer ChainFlexible Weatherproof Conduit From Junction Box to Disconnect SwitchFloating Hinge ArrangementGrease Drain and Collection Box

ROOF CURBS

Prefabricated Roof Curbs: Roof Curbs shall be a prefabricated type, constructed of heavy gauge steel with prime coat, continuously welded on all vertical seams and shall be of the same manufacturer as the fans they support.

Curb shall be of self-flashing design and shall have adequate horizontal flange of strip flashing.

Units shall be thermally and acoustically insulated.

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Curbs shall have full metal liner.

Curbs extension shall be 18 inches high with a factory access door, gravity backdraft damper.

5. Curb opening must be sized large enough to accommodate fire wrap insulation to the fan.

UTILITY SETS

General Requirements: Belt drive utility sets shall be as detailed on Drawings and specified. Capacity ratings shall be based upon tests performed in strict accordance with AMCA Standard 210 test code for air moving devices. Fans shall carry near manufacturer's nameplate, the seal authorized by AMCA indicating that capacity ratings are certified. Fans not bearing this seal will not be acceptable.

Housing: Housing shall be convertible to (8) standard positions. Side sheets shall be mechanically fastened to scroll sheets and housing supports and shall be welded construction. Inlet collars shall extend beyond housing for easy duct connection.

Wheel: Wheel shall be air foil (AF) backward inclined (BL) or forward curved (FC) as called for and shall be securely welded in place, true and balanced statically and dynamically.

Bearings: Bearings shall be permanently greased, self-aligning, long life, anti-friction, pillow block bearings.

Drive: Drive shall be either direct connected or belt drive. Size V-belt drives at 1.4 minimum service factor. Provide unit with a fixed drive pulley for specified duty. Contractor shall provide (1) additional drive pulley with installation labor, performance rating to be selected and to be installed following system installation, and running check and balance. Contractor shall retain drive pulley not used.

Motors: Motors shall be of an energy efficient design and shall be mounted on an adjustable base furnished by unit manufacturer. Motor shall have integral automatic reset thermal overload protection. Refer to Section 23 05 13, Common Motor Requirements for HVAC Equipment, or the Equipment Schedule for voltage and rpm requirements. Refer to Section 23 05 13 for motor minimum efficiency. Motors shall be factory mounted whenever possible.

Unit shall be provided with a factory installed disconnect switch.


KITCHEN HOOD EXHAUST FANS (UTILITY SET)

General Requirements: Belt drive utility sets shall be as detailed on Drawings and specified. Capacity ratings shall be based upon tests performed in strict

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accordance with AMCA Standard 210 test code for air moving devices. Fans shall carry near manufacturer's nameplate, the seal authorized by AMCA indicating that capacity ratings are certified. Fans not bearing this seal will not be acceptable.

Ratings:

Kitchen hood exhaust power roof utility set shall be safety tested and listed by UL to operate continuously at 300 degrees F for the removal of smoke and grease laden vapors.

Kitchen exhaust power roof utility set ratings shall be based upon tests performed in strict accordance with AMCA Standard 210 Test Code for air moving devices and shall carry the AMCA seal.

Housing: Housing shall be convertible to (8) standard positions. Side sheets shall be mechanically fastened to scroll sheets and housing supports and shall be welded construction. Inlet collars shall extend beyond housing for easy duct connection.

Unit housing shall receive (2) coats of UL approved epoxy primer with polyurethane enamel finish.

Galvanized steel vertical discharge hood and motor/drive cover shall be primed and shall receive (2) coats of rust resistant paint.

Fan housing scroll to have access door that is watertight.

Fan Shaft: Fan shaft shall be precision ground for a precise fit.

Motors: Unit shall be furnished with a UL approved open drip proof motor of an energy efficient design. Motor shall have integral automatic reset thermal overload protection.

Refer to Section 23 05 13, Common Motor Requirements for HVAC Equipment, or the Equipment Schedule for voltage and rpm requirements. Refer to Section 23 05 13 for motor minimum efficiency. Motor and drive chamber shall be furnished with a heat shield to protect against heat transmitted and radiated from below.


On fans that have a variable frequency drive, provided factory mounted motor shaft ground system and the motor shall be inverter duty type motor.

NFPA 96 Compliance: Fan shall meet requirements of NFPA 96 to include, but not be limited to:

Flexible Weatherproof Conduit From Junction Box to Disconnect Switch

Grease Drain and Collection Box

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Wheel: Wheel shall be air foil (AF) backward inclined (BL) or forward curved (FC) as called for and shall be securely welded in place, true and balanced statically and dynamically.

Bearings: Bearings shall be permanently greased, self-aligning, long life, anti-friction, pillow block bearings.

Drive: Drive shall be either direct connected or belt drive. Size V-belt drives at 1.4 minimum service factor. Provide unit with a fixed drive pulley for specified duty. Contractor shall provide (1) additional drive pulley with installation labor, performance rating to be selected and to be installed following system installation, and running check and balance. Contractor shall retain drive pulley not used.

SMALL CABINET FAN - EXHAUST

General Requirements: Cabinet fans shall be UL listed fans and shall be statically and dynamically balanced in factory prior to shipping.

Housing: Fan housing shall be of galvanized steel or aluminum, in-line design, acoustically insulated muffler box. Integral backdraft damper shall be totally shatterproof with no metal to metal contact.

Wheel: Fan shall have true centrifugal wheel.

Motor: Direct drive, permanently lubricated motor shall be maximum 1,550 rpm fractional horsepower type with rubber-in-shear vibration eliminator mounts.

Entire fan, motor, and wheel assembly shall be removable without disturbing the housing.

Electrical: Provide terminals with plug and cord inside of housing. Motor shall be suitably grounded.

Provide units with a solid state speed controller mounted on unit.

CENTRIFUGAL FANS

General Requirements: Centrifugal fans shall be belt driven, non-power overloading type, and shall be of the specified size, arrangement, class, and capacity as shown on Drawings. Fans having outlet velocities greater or requiring horsepower greater than those shown shall not be acceptable. Fan ratings shall be based upon tests performed in strict accordance with AMCA Standard 210 test code for air moving devices. Fans shall carry, near manufacturer's nameplate, the seal authorized by AMCA indicating that ratings are certified. Fans not bearing this seal shall not be acceptable. Fans shall have tagging identification engraved on the manufacturer's nameplate.

Housing: Heavy gauge steel, all-welded construction, rigidly supported with structural bracing. Fans 66 inches and larger shall have split housings with heavy flanges on both sections for assembly. Provide lifting eyes or lifting holes in support structure on fans 36 inches and larger for ease of handling. Inlet collars on

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SWSI fans shall extend beyond fan housing to provide easy connection to system ducts.

Wheel: Backward inclined (BI) and airfoil (AF) blades shall be securely welded to the spun rim and hub plate. Key fan wheels to shaft. Wheels shall be trued after assembly and shall be statically and dynamically balanced.

Bearings: Equip fans with precision, anti-friction type bearings on self-aligning, grease packed pillow block type. Use extended grease tubes where applicable for service.

Fan Shafts: A solid hot rolled type steel, accurately turned, ground and polished.

Motors: Motors shall be of an energy efficient design and shall be mounted on an adjustable base furnished by unit manufacturer. Motor shall have integral automatic reset thermal overload protection. Refer to Section 23 05 13, Common Motor Requirements for HVAC Equipment, or the Equipment Schedule for voltage and rpm requirements. Refer to Section 23 05 13 for motor minimum efficiency. Motors shall be factory mounted whenever possible. Motors supplied with equipment furnished under Division 23 that are operated through a variable frequency drive shall be provided with factory mounted motor shaft ground system and the motor shall be invertor duty type.

Bearings: Precision, flange mounted, self-aligning bearing shall be at the inlet and discharge. Bearings shall be grease lubricated and selected for a minimum average life (AFBMA L-10) in excess of 200,000 hours at maximum cataloged operating conditions. Bearing grease-lines shall be extended out through the fan shell and acoustical enclosure.




Drives: Drives shall be selected to have a 1.4 minimum service factor. Provide unit with a fixed drive pulley for specified duty. Contractor shall provide (1) additional drive pulley and installation labor, performance rating to be selected, to be installed following system installation running check and balance. Contractor shall retain drive pulley not used.

Weather Hoods: Fans to be mounted out-of-doors shall have motor protected with a weather hood capable of turning away rain or snow, but providing adequate ventilation for the motor to remain in its operating temperature range.

PROPELLER FANS-BELT DRIVE

Ratings: Fan ratings shall be based upon tests performed in strict accordance

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with AMCA Standard 210 test code for air moving devices. Fans shall carry, near manufacturer's nameplate, the seal authorized by AMCA indicating that ratings are certified. Fans not bearing this seal shall not be acceptable. Fans shall have tagging identification engraved on manufacturer's nameplate.

Propeller Assembly: Propeller shall be (5) or (6) die-formed blades attached to a spider hub consisting of die-formed steel arms fastened to a machined steel insert. A standard square key and (2) set screws shall lock propeller to shaft.

Propeller Shaft and Drive: Mount steel propeller shaft in permanently lubricated, sealed ball bearing pillow blocks. Motor sheaves shall be adjustable and drives sized for 1.6 of driven horsepower. Pulleys shall be machined cast iron and keyed to shafts.

Drive Frame Assembly: Drive frame assembly shall be formed steel with slotted mounting members to allow adjustment and centering of propeller.

Fan Panel and Finish: Fan panel shall have pre-punched mounting holes formed flanges with welded corners and a deep formed venturi. Prime structural members and fan blades with a rust inhibitor and finish with a thermosetting enamel to provide resistance to moisture and other contaminating factors in the air.

Fan Safety Guard: Provide an extruded aluminum framed guard for back (motor side) of fan. Frame shall be heavy gauge aluminum angle. Guard shall be constructed of 1/2-inch by 1-inch mesh heavy gauge, welded, galvanized wire, open on all sides for air flow. Guards shall bolt to fan frame for easy removal.

A galvanized angle guard frame may be used in lieu of aluminum.

Motors: Motors shall be of an energy efficient design and shall be mounted on an adjustable base furnished by unit manufacturer. Motor shall have integral automatic reset thermal overload protection. Refer to Section 23 05 13, Common Motor Requirements for HVAC Equipment, or the Equipment Schedule for voltage and rpm requirements. Refer to Section 23 05 13 for motor minimum efficiency. Motors shall be factory mounted whenever possible.


MIXED FLOW FANS

General Requirements: Fans shall be UL listed fans, shall be rated based on tests made in accordance with AMCA Standards 210 and 300, shall meet the requirements of certified AMCA ratings and shall bear the AMCA Certified Rating Seal.

Fans shall be dynamically balanced to eliminate vibration and noise transmission to occupied areas. Variable air volume fans shall be balanced at (10) different fans speeds over the specified operating range.

Fan Wheel: Fan wheel shall be steel, non-overloading high efficiency mixed-flow type. Wheel shall be dynamically balanced and keyed to fan shaft.

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Fan Housing: Housings shall be made of 14 gauge steel hydraulically expanded to form integral inlet bell and diffusers sections. Hydraulically expanded stiffing ring welded in area of wheel raceway. On VAV variable speed fan units, fan inlet supports shall be structurally reinforced to handle extra stresses of variable speed fan modulation. Provide inlet or outlet screen when no ductwork connection is made to the fan.

Fan shall have tapered inlet and outlet shells over fan hub assembly. Shells shall uniformly accelerate air through blade area. End bell covers drive assembly and shall thereby reduce flow turbulence. Blade to shell clearance shall be in the range of 30 mils.

Fan parts shall be painted with a enamel primer prior to final assembly. Finish coat shall be minimum 2 mil thick enamel applied to the exterior surfaces after assembly.

Motors and Drives: Refer to Section 23 05 13, Common Motor Requirements for HVAC Equipment, or the Equipment Schedule for voltage and rpm requirements. Refer to Section 23 05 13 for motor minimum efficiency. Furnish unit with a disconnect switch inside fan housing, factory wired from disconnect switch to motor.

Bearings: Precision, flange mounted self-aligning bearing shall be at the inlet and discharge. Bearings shall be grease lubricated and selected for a minimum average life (AFBMA L-10) in excess of 200,000 hours at maximum cataloged operating conditions. Bearing grease-lines shall be extended out through the fan shell and acoustical enclosure.


V-Belt Drive: Cast iron or steel shall be computer selected for low noise, low maintenance operation. Center distance and arc of contact shall be maintained within prefixed limits. Constant speed fans shall use variable or constant pitch drives; variable speed modulated fans shall use fixed drives only. Contractor shall provide (1) additional drive pulley and installation labor, performance rating to be selected, to be installed following system installation running check and balance. Contractor shall retain drive pulley not used. Provide synchronous driver package over 10 horsepower where VFD’s are used.



LOW SILHOUETTE PROPELLER POWER RELIEF FANS - BELT DRIVE

Ratings: Fan ratings shall be based upon tests performed in strict accordance

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with AMCA Standard 210 test code for air moving devices. Fans shall carry, near manufacturer's nameplate, the seal authorized by AMCA indicating that ratings are certified. Fans not bearing this seal shall not be acceptable. Fans shall have tagging identification engraved on manufacturer's nameplate.

Propeller Assembly: Propeller shall be (5) or (6) die-formed blades attached to a spider hub consisting of die-formed steel arms fastened to a machined steel insert. A standard square key and (2) set screws shall lock propeller to shaft.

Propeller Shaft and Drive: Mount steel propeller shaft in permanently lubricated, sealed ball bearing pillow blocks. Motor sheaves shall be adjustable and drives sized for 1.6 of driven horsepower. Pulleys shall be machined cast iron and keyed to shafts.

Drive Frame Assembly: Drive frame assembly shall be formed steel with slotted mounting members to allow adjustment and centering of propeller.

Fan Panel and Finish: Fan panel shall have pre-punched mounting holes formed flanges with welded corners and a deep formed venturi. Prime structural members and fan blades with a rust inhibitor and finish with a thermosetting enamel to provide resistance to moisture and other contaminating factors in the air.

Fan Safety Guard: Provide an extruded aluminum framed guard for back (motor side) of fan. Frame shall be heavy gauge aluminum angle. Guard shall be constructed of 1/2-inch by 1-inch mesh heavy gauge, welded, galvanized wire, open on all sides for air flow. Guards shall bolt to fan frame for easy removal.

A galvanized angle guard frame may be used in lieu of aluminum.

Motors: Motors shall be of an energy efficient design and shall be mounted on an adjustable base furnished by unit manufacturer. Motor shall have integral automatic reset thermal overload protection. Refer to Section 23 00 00, Electrical Motor Schedule, or the Equipment Schedule for voltage and rpm requirements. Section 23 00 00 for motor minimum efficiency.


On fans that have a variable frequency drive, provided factory mounted motor-shaft ground system and the motor shall be inverter duty type.

When required for proper testing, adjusting, and balancing, this Contractor shall provide one additional drive pulley with installation and labor per unit. Performance rating shall be selected and correct size pulley shall be installed following system installation, and running check and balance. Contractor shall retain drive pulley not used.

Roof Curb: Curb shall be fabricated of 18 gauge galvanized steel with liquid tight, continuously welded corner seams, prime coat, 1 1/2 inch wood nailer and 1 1/2 inch, 3 pound density rigid fiberglass insulation. Curb shall be straight cantless type with full metal liner. All curbs to have an 18” curb extension with factory access door, gravity back draft damper.

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PART - EXECUTION

POWER ROOF EXHAUSTERS - DIRECT, BELT DRIVE, AND VERTICAL DISCHARGE

General Requirements: Contractor shall provide proper roof curbs for units and shall coordinate fan locations and curb sizes with the appropriate contractor to provide proper roof openings.

Vibration Isolation: Provide units with 1/2-inch thick rubber or Type G vibration isolation strip (Section 23 05 48, Vibration and Seismic Controls for HVAC Piping and Equipment) full perimeter of top of roof curb.

Electrical: Units shall be factory wired from disconnect switch to motor. Electrical Contractor will connect to disconnect switch. Other wiring shall be by Contractor as follows:

Speed Controllers: When direct drive units employ a solid state speed control switch, Contractor shall install switch and shall wire through speed control to disconnect switch. Mount speed switch where shown on Drawings or at unit if no location indicated.

Set Equipment: Units shall be set on curb and anchored with cadmium plated lag bolts. Provide cadmium plated wing nuts for each lag bolt.

Roof Curbs: Roof curb is furnished by this Contractor and installed by this Contractor.

Height of curb shall provide a minimum of 24 inches above the roof to the fan opening.

SMALL CABINET FAN - EXHAUST

General Requirements: Contractor shall coordinate fan locations and sizes with other equipment and conditions to provide proper connections to units.

Electrical: Units shall be factory wired from the disconnect at terminal box to motor. Power connection to terminal box shall be by Electrical Contractor.

Vibration Isolation: Unit shall be hung from structure with four 3/8-inch rods and Type F vibration isolators.

CENTRIFUGAL FANS/UTILITY SETS/AIRFOIL AXIAL FANS INSTALLATION AND SUPPORT

Framework: Furnish and install angle and channel iron and welded structural steel supports incidental to mounting units as shown on Drawings. Coat steel work provided under this Section with rust inhibitive primer.

Vibration Isolation: Units shall have vibration isolators shall be Type E for

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suspended units and Type B for floor mounted units. Refer to Section 23 05 48 Vibration and Seismic Controls for HVAC Piping and Equipment. Floor mounted isolators shall be bolted to unit and to floor.

Flexible Connections: Flexible connections to ductwork and units shall be Ventglas double, neoprene coated fabric, 1/16 inch thick or equal and approved. Provide instrument test holes and caps located downstream of discharge of fans for checking and adjusting air flow. Balance fans as specified.

Flexible connectors shall not be used on kitchen exhaust hood ductwork when using a utility set exhaust fan. Instead, provide flanges bolted to the fan as indicated in NFPA 96 using a 1,500 degree F rated sealant. If required, the Contractor shall dynamically balance the fan after installation to reduce excessive vibration since there is no flexible connection.

Installation: Install unit in location indicated on Drawings. Bolt sections together with gaskets installed in accordance with manufacturer's recommendations. Connect ductwork to unit with flexible connections.

Lubrication: After systems and equipment have been installed and just prior to building acceptance, properly lubricate motors and equipment installed under this Section.

Balancing: Adjust fan speed to provide specified output and prepare report as specified in Section 23 05 93, Testing, Adjusting, and Balancing for HVAC.

EQUIPMENT INSTALLATION AND SUPPORT - PROPELLER FANS

Framework: Enclose louver and motorized damper in an 18 gauge sheet metal housing reinforced at wall with 2-inch by 2-inch by 1/4-inch angle iron. Connect propeller fan panel to housing and include a belt/motor guard.

Fan safety guard shall completely enclose drive side of fan.

Coat steel work provided under this section with rust inhibitive primer.

Installation: Install unit in location indicated on Drawings. Firmly attach sections to housing with reinforcing support angles to wall.

Balancing: Adjust fan speed to provide scheduled output and prepare report as specified in Section 23 05 93, Testing, Adjusting, and Balancing for HVAC.

MIXED FLOW FAN INSTALLATION AND SUPPORT

Framework: Furnish and install angle and channel iron and welded structural steel supports incidental to mounting units as shown on Drawings. Coat steel work provided under this Section with rust inhibitive primer.

Vibration Isolation: Units shall have vibration isolators shall be Type E for suspended units. Refer to Section 23 05 48, Vibration and Seismic Controls for HVAC Piping and Equipment.

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Flexible Connections: Flexible connections to ductwork and units shall be Ventglas double, neoprene coated fabric, 1/16-inch thick or equal and approved. Provide instrument test holes and caps located downstream of discharge of fans for checking and adjusting air flow. Balance fans as specified.

Installation: Install unit in location indicated on Drawings. Bolt sections together with gaskets installed in accordance with manufacturer's recommendations. Connect ductwork to unit with flexible connections.

Lubrication: After systems and equipment have been installed and just prior to building acceptance, properly lubricate motors and equipment installed under this Section.

Balancing: Adjust fan speed to provide specified output and prepare report as specified in Section 23 05 93, Testing, Adjusting, and Balancing for HVAC.

FAN SCHEDULES

Refer to Drawings for schedules.

END OF SECTION

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