The fan shall be constructed of aluminized steel. Fan scroll shall be continuously sealed with a list intumescent to prevent grease leakage. The fan discharge scoop shall be fully weld and have a 2" fully welded drain to prevent grease leakage and blockage of the drain. Fan shall include integral hinge at the base of the fan power pack to allow the wheel to tilt out of the fan housing for easy cleaning of the duct in compliance with NFPA-96. Hinge shall be designed to limit the amount of travel and be self-locking with manual release. The hinged section of the fan shall be provided with heavy gauge, oversized handle in place to allow safe, fast and easy opening.
The base shall be constructed of heavy gauge galvanized steel with pre-punched mounting holes for fasteners. Base corners shall be welded and painted to provide strength and support for hinging and cleaning and to prevent leakage into the building.
The fan wheel shall be centrifugal backward inclined and non-overloading. Wheels shall be balanced in two planes and done in accordance with AMCA standard 204-96, Balance Quality and Vibration Levels for Fans. The wheel blades shall be aerodynamically designed to minimize turbulence, increase efficiency and reduce noise. The wheel shall be heavy gauge welded aluminum. In the event that balancing weights are required they shall be riveted or welded to the blades or wheel. The wheel inlet shall overlap the fan base inlet for maximum performance and efficiency. The wheel shall be firmly attached to the motor shaft with set screws.
Motor & Motor Compartment
Motors shall be heavy duty ball bearing type, mounted out of the airstream and furnished at the specified voltage, phase and enclosure. Motor mounting plate shall be constructed of heavy gauge steel and isolated from the fan structure with vibration isolators or gasket material. The motor compartment shall be cooled by outside air drawn through louvers in the motor cover. The motor compartment shall be completely removable to provide unobstructed access to the motor and drives. The fan shall have a tilt open top cover assembly that allows the wheel to be tilted back for easy access during cleaning and maintenance. The motor cover assembly shall have wing bolts to secure the assembly to the housing.
Shaft and Bearings
Shafts shall be precision ground and polished. Heavy duty, per-lubricated bearings shall be selected for a minimum life (L10) life in excess of 200,000 hours of operation at cataloged operating speed. They shall be designed and individually tested specifically for use in air handling applications.
Belts & Drives
Belts shall be oil and heat resistant, non-static type. Drives shall be cast type, precision machined and keyed and secured attached to the fan and motor shafts. Drives shall be sized for a minimum of 150% of the installed motor horsepower. Fan operating speed shall be factory set using adjustable pitch motor pulleys; motors over 2 HP will come standard with double groove pulleys.
The 2" grease drain is fully welded in the discharge scoop, a removable grease trough is attached to the scoop to collect grease.
Safety Disconnect Switch
A safety disconnect switch shall be standard on all FHV-RE units with open drip proof motors. Switches shall be installed in a NEMA3R enclosure and mounted to exterior of the fan for easy access. The safety disconnect switch shall be interlocked with the fan. The fan motor cover and (or) wheel compartment shall not be accessible unless the safety disconnect is in the off position.
Product: Fan shall be model FHV-RE as manufactured by FloAire.