SECTION 15865

AXIAL FANS

PART 1 GENERAL

SECTION INCLUDES

Vaneaxial fans.

Tubeaxial fans.

Propeller fans.

Motors and drives.

Accessories.

RELATED WORK

Section 15170 - Motors.

Section 15242 - Vibration Isolation.

Section 15855 - Air Handling Units With Coils.

Section 15890 - Ductwork.

Section 15910 - Ductwork Accessories: Backdraft dampers.

Section 15973 - Pneumatic Controls.

Section 15975 - Direct Digital Control Systems.

Section 16180 - Equipment Wiring Systems: Electrical characteristics and wiring connections.

REFERENCES

AFBMA 9 - Load Ratings and Fatigue Life for Ball Bearings.

AFBMA 11 - Load Ratings and Fatigue Life for Roller Bearings.

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 Publishing Sound Ratings for Air Moving Devices.

NEMA MG1 - Motors and Generators.

NFPA 70 - National Electrical Code.

SMACNA - HVAC Duct Construction Standards - Metal and Flexible.

SUBMITTALS

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

Shop Drawings: Indicate assembly of axial fans and accessories including fan curves with specified operating point clearly plotted, sound power levels for both fan inlet and outlet at rated capacity, and electrical characteristics and connection requirements.

Product Data: Provide data on axial fans and accessories including fan curves with specified operating point clearly plotted, sound power levels for both fan inlet and outlet at rated capacity, and electrical characteristics and connection requirements.

Submit performance data for adjustable axial fan blades for at least five blade settings, including maximum.

Manufacturer's Installation Instructions.

OPERATION AND MAINTENANCE DATA

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

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

DELIVERY, STORAGE, AND HANDLING

Deliver, store, protect and handle products to site under provisions of Section [01600.] [________.]

Protect motors, shafts, and bearings from weather and construction dust.

EXTRA MATERIALS

Furnish under provisions of Section [01700.] [________.]

Provide [two] [____] sets of belts for each fan.

PART 2 PRODUCTS

AXIAL FANS

Manufacturers:

[_________________________________] Model [________].

Other acceptable manufacturers offering equivalent products.

[_____________________________] Model [________].

[_____________________________] Model [________].

[_____________________________] Model [________].

Product Requirements:

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.

Performance Base: [Sea level] [________] conditions.

Temperature Limit: Maximum [300] [600] [____] degrees F ([150] [315] [____] degrees C).

Performance:

Air Flow: [_____] cfm ([_____] L/sec) at [_____] in wg ([_____] Pa).

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

Hub and Impeller:

Airfoil Impeller Blades: Adjustable die cast aluminum alloy [or glass reinforced polyester resin] [or welded steel die formed blades with belt drive].

Hub: Die cast aluminum alloy or cast iron hub [or with belt drive of spun, welded steel], bored and keyed to shaft; to facilitate indexing of blade angle with [manual] [automatic] adjustment stops.

Controllable Pitch Assemblies: Incorporate ball bearing counterbalanced blade and variable pitch assembly into hub with mechanical link to casing exterior mounted actuator, or pneumatic or electric actuator incorporated within hub.

Cast Components: X-ray components after fabrication and statically and dynamically balance assembly before attachment to motor or shaft.

Casing:

Fabricate casing of [1/4] [_____] inch ([6] [_____] mm)steel for fans [40] [50] [_____] inch (1 000] [1 250] [_____] mm) in diameter and smaller and [3/8] [_____] inch([0.9] [_____] mm)] steel for larger fans.

Continuously weld, with inlet and outlet flange connections, and motor or shaft supports. Incorporate flow straightening guide vanes for fans specified for static pressures greater than [one] [1.5] [2] [_____] in wg ([250] [375] [500] [_____] Pa).

Finish [with one coat enamel applied to interior and exterior.] [by hot dip galvanizing finished assembly.]

Bearings and Drives:

Bearings: AFBMA 9, [L-10 life at 50,000 hours] [L-50 life at 100,000 hours] heavy duty pillow block type, self-aligning, grease-lubricated ball bearings, or AFBMA 11 [L-10 life at 50,000 hours] [L-50 life at 100,000 hours] pillow block type, self-aligning, grease-lubricated 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 sheaves for motors 15 hp (11.2 kW) and under selected so required rpm is obtained with sheaves set at mid-position; fixed sheave for 20 hp (15 kW) and over, matched belts, and drive rated as recommended by manufacturer or minimum 1.5 times nameplate rating of the motor.

Belt Guard: Fabricate to SMACNA Standards; of 12 gage (2.8 mm), 3/4 inch (19 mm) diamond mesh wire screen welded to steel angle frame or equivalent, prime coated. Secure to fan or fan supports without short circuiting vibration isolation, with provision for adjustment of belt tension, lubrication, and use of tachometer with guard in place.

Lubrication: Extend lubrication fittings to outside of casing.

Electrical Characteristics and Components:

Electrical Characteristics:

[____] hp ([____] kW).

[____] volts, [single] [three] phase, 60 Hz].

[____] amperes maximum [fuse size] [circuit breaker size] [overcurrent protection].

[____] percent minimum power factor at rated load.

Refer to Section 16180.

Motor:	[Refer to Section 15170.] [NEMA MG1, [____].]

Wiring Terminations:	Provide terminal lugs to match branch circuit conductor quantities, sizes, and materials indicated. Enclose terminal lugs in terminal box sized to NFPA 70.

Accessories:

Guide Vanes: Welded steel construction with airfoil vanes and casing flanges, finished to match casing.

Adjustable Inlet Vanes: Steel construction with blades[supported at both ends] [cantilevered] with two permanently lubricated bearings, variable mechanism [out of air stream] terminating in single control lever with control shaft for double width fans [and locking quadrant.]

Inlet Bell: Bell mouth inlet fabricated of [steel] [aluminum] [fibreglass reinformed plastic] with

flange.

Outlet Cones: Fabricated of steel with flanges, outlet area/inlet area ratio of [1.5/1.0] [________], with center pod as recommended by manufacturer.

Inlet Screens: Galvanized steel welded grid to fit inlet bell.

Dampers: Welded steel construction, consisting of two semi-circular vanes pivoted on oil-retaining bearings in short casing section, finished [with one coat enamel.] [by hot dip galvanizing.] Provide [airstream operation closing blades by reverse air flow and gravity.] [hand operation with handwheel control of screw and link mechanism.] [motor actuation; refer to Section [15973] [15975].]

Access Doors: Shaped to conform to casing with quick opening latches and gaskets.

Blade Pitch Actuator: Factory mounted and calibrated, [electric actuator requiring single phase power and accepting electric input.] [electric actuator requiring single phase power and accepting pneumatic control input signal.] [pneumatic actuator requiring [25 psi (1070 kPa)] main supply pressure and accepting pneumatic control input signal.]

Stall Alarm Probe: Factory installed sensing probe to detect fan operation in stall. Refer to Section [15973] [15975].

Vibration Detector: Factory installed vibration switch to stop fan [with extra set of contacts]. Refer to Section [15973] [15975].

PROPELLER FANS

Manufacturers:

[_________________________________] Model [________].

Other acceptable manufacturers offering equivalent products.

[_____________________________] Model [________].

[_____________________________] Model [________].

[_____________________________] Model [________].

Impeller: Shaped steel or steel reinforced aluminum blade with heavy hubs, statically and dynamically balanced, [keyed and] locked to shaft, directly connected to motor [or provided with V-belt drive.]

Electrical Characteristics and Components:

Electrical Characteristics:

[____] hp ([____] kW).

[____] volts, [single] [three] phase, 60 Hz].

[____] amperes maximum [fuse size] [circuit breaker size] [overcurrent protection].

[____] percent minimum power factor at rated load.

Refer to Section 16180.

Motor: [Refer to Section 15170.] [NEMA MG1, [____].] Self-aligning pre-lubricated ball or sleeve bearings affixed to mounting plate [permitting belt tensioning], neoprene vibration isolation between fan assembly and mounting plate.

Wiring Terminations:	Provide terminal lugs to match branch circuit conductor quantities, sizes, and materials indicated. Enclose terminal lugs in terminal box sized to NFPA 70.

Frame: One piece, square steel with die formed venturi orifice, mounting flanges and supports, with baked enamel finish.

Backdraft Damper: Multiple blade with offset hinge pin,

blades linked.

Safety Screens: One inch (25 mm) galvanized wire over inlet, motor, and drive [and backdraft damper for separate mounting on outlet].

PART 3 EXECUTION

INSTALLATION

Install in accordance with manufacturer's instructions.

Install axial fans as [indicated.] [specified.] Install with resilient mountings specified in Section 15242 and with flexible electrical leads.

Install flexible connections specified in Section 15910 between axial fan inlet and discharge ductwork. Ensure metal bands of connectors are parallel with minimum one inch (25 mm) flex between ductwork and axial fan while running.

Install fan restraining snubbers as [indicated.] [required.] Refer to Section 15242. Adjust snubbers to prevent tension in flexible connectors when fan is operating.

Provide [fixed] sheaves required for final air balance.

Provide safety screen where inlet or outlet is exposed.

Provide backdraft dampers on discharge of exhaust fans and as indicated.

Provide access to adjustable blade axial fan wheels for varying blade angle setting. Adjust blades for varying range of volume and pressure.

Provide floor mounted axial fans with reinforced legs. Provide ceiling suspended units with support brackets

bolted to casing flange.

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

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 hp

Sound Power

Discharge

1st Octave

2nd Octave

3rd Octave

4th Octave

5th Octave

6th Octave

7th Octave

8th Octave

Inlet

1st Octave

2nd Octave

3rd Octave

4th Octave

5th Octave

6th Octave

7th Octave

8th Octave

Accessories

END OF SECTION