48" Roof Vent Less Drive Package, CFM Range:25642 to 34761 0.000-In Sp, Bearing Type:High Temperature Regreaseable Pillow Block, Drive Type:Belt, Max Inlet Temperature:120F, Type:Exhaust Ventilator, Propeller Diameter:48", Mounting Location:Roof, Emergency Smoke Removal Axial Upblast, Housing Material:Galvanized Steel, Agency Compliance:Ul Emergency Smoke Control/Ul 793, Base Dims:57 1/2" X 57 1/2", Height:71 5/16", Weight:745 Lbs, In Bulk, Made In USA