Type VSBC Backward Inclined Ventilating Set

CONSTRUCTION: American Coolair Ventilating Belt Set Type VSBC features as follows: fan housings shall be heavy gauge, continuously welded construction. Housings shall be suitably braced to prevent vibration or pulsation. Housings shall have tapered spun, aerodynamically designed inlet cones or shrouds providing stable flow and high rigidity. Housings shall be of the rotatable design, convertible to eight standard discharge configurations. VSBC backward inclined wheels shall be single thickness plate type designed for maximum efficiency and quiet operation and shall be of the non-overloading type. Class I wheels, sizes 12 through 27, shall be constructed of aluminum with the blades riveted and welded to the spun wheel cone and back plate. Class I wheels, sizes 30 through 36, and all Class II wheels shall be constructed of heavy gauge steel with welded (not riveted) blades. Shafts shall be AISI 1040 or 1045 hot rolled steel, accurately turned, ground, polished, and ring gauged for accuracy. Shafts shall be sized for the first critical speed of at least 1.43 times the maximum speed. Bearings shall be heavy duty, grease lubricated, anti-friction ball, self-aligning, pillow block type and selected for a minimum average bearing life (AFBMA L-50) in excess of 200,000 hours at the maximum fan RPM. Motor sheaves shall be cast iron, and supplied as either variable pitch or fixed pitch. Drives and belts shall be rated for a minimum of 120% of the required HP.

ACCESSORIES: When specified, accessories such as belt guards, weather covers, access doors, variable inlet vanes, outlet shutters, inlet screens, etc., shall be provided by American Coolair Corporation to maintain one source responsibility. UL705 (OPTIONAL) - VSBC fans shall be listed under UL 705 for power ventilators. VSBC fans shall include a UL listed motor, V-belt drive, special weather cover with additional cooling louvers, and UL705 label. Disconnect switches or other devices (not including motor) shall be field mounted and wired in accordance with all local and national codes. UL762 (OPTIONAL) - VSBC fans shall be listed under UL 762 for power ventilators used in restaurant exhaust service (grease laden air). VSBC fans shall include a UL listed motor, V-belt drive, special weather cover with additional cooling louvers, bolted access door, drain connection, wheel back plate fins, and UL label. VSBC fans shall be upblast or top angular up discharge and shall have a discharge height of at least 40” above the roof line. They are to be installed in accordance with NFBA 96. Disconnect switches or other devices (not including motor) shall be field mounted and wired in accordance with all local and national codes. FINISH AND COATING- The entire fan assembly, excluding the shaft, shall be thoroughly degreased and deburred before application of a rust-preventative primer. After the fan is completely assembled, a finish coat of paint shall be applied to the entire assembly. The fan shaft shall be coated with a petroleum-based rust protectant. Aluminum components shall be unpainted.