Eliminates heat build up in barns, greenhouses and industrial buildings. Heavy-duty 18 gauge galvanized steel housing and venturi support 12 gauge motor mount. Includes aluminum shutters on intake with tie bars and shutter clips for secure closure. Heavy-duty galvanized X-frame motor mount provides rigidity for increased life and quieter operation. Balanced galvanized steel fan blades offer smooth operation. Enclosed motor has sealed ball bearings and automatic thermal overload protection for long life. Models without Cone feature a 12 gauge, 1 x 2 mesh guard. Guard is galvanized after welding. Includes poly isolation guard clips that help reduce vibration and noise. Models With Cone include a heavy gauge galvanized cone with safety cone guard. 48 & 50 Belt Drive Models include a heavy spring belt tensioner to ensure long motor life. UL listed. Easy assembly. 2 Year Limited Warranty.