Wall master galvanized exhaust fans j&d 36in diameter fan – 1-speed, single phase direct drive motor – galvanized blades eliminates heat build-up in barns, greenhouses and industrial buildings. Exhaust fans feature external aluminum shutters with tie bars to help prevent shutter flapping. Heavy-duty 18 gauge steel housing. Hot dipped after welded, galvanized 1in x 2in x 12 gauge removable wire mesh guards. Includes poly guard clips to reduce vibration. Totally enclosed motor has sealed ball bearings and automatic thermal overload protection. Galvanized x-frame motor mount provides rigidity for long life and quiet operation. 3 galvanized steel blades are balanced for smooth operation. Exhaust fans include provisions for hardwire installation. Field convertible 115/230v. Motor is ul/ulc recognized. 2 year limited warranty. horsepower rating based upon maximum speed/load.