Specifications - City of Montpelier, Vermont

Title:15850 – FansMontpelier District HeatingCity of Montpelier, VTIssue Date:September 28, 2012Page #:4 of 7E. Service Factor: 1.4.F. Belts: Oilresistant, nonsparking, and nonstatic.G. Motors and Fan Wheel Pulleys: Adjustable pitch for use with motors through 15HP; fixed pitch for use with motors larger than 15 HP. Select pulley so that pitchadjustment is at the middle of the adjustment range at fan design conditions.H. Belt Guards: Provide steel belt guards for motors mounted on the outside of thefan cabinet.2.2 ROOF EXHAUSTERSA. General Description: Belt or direct drive (as scheduled on the Drawings) fans forroof or wall mounting with integral domed housing. Motor assembly shall bemounted on vibration isolators.B. Materials: Housing shall be seamless spun aluminum, fan shall be aluminum.C. Fan Wheel: Backward inclined (BI).D. Bearings: Pillow block type with minimum (L50) life of 200,000 hours.E. Finish: None required.F. Accessories:1. Disconnect Switch: NEMA 3R enclosure within motor compartment.2. Provide upblast discharge where indicated.3. Provide motorized or gravity backdraft damper as indicated on theDrawings.4. Where grease exhaust service is scheduled on the Drawings, provideNEMA 3R external disconnect, grease collection, and other accessories asrequired to meet UL 762 listing and the requirements of NFPA 96.G. Manufacturers:1. Cook ACE, ACW, ACRU.2. Greenheck Model G, CU series.FANS 15850 4