THE GUARD MOUNTED DIRECT DRIVE EXHAUST FAN IS MADE FOR LOW-PRESSURE EXHAUSTING AND COOLING APPLICATIONS. THREE ALUMINUM FAN BLADES ARE ENCLOSED IN STEEL SPIRAL WIRE GUARDS FOR SAFETY. THIS FAN CAN BE BOLTED DIRECTLY TO THE WALL WITH BUILT-IN MOUNTING HOLES. THIS FAN IS SINGLE SPEED WITH AN OPERATING SPEED OF 1100 RPM. THE FAN MEASURES 24"" IN DIAMETER. IT IS UL CUL LISTED AND CONFORMS TO UL507 STANDARD.