Dayton cabinet exhaust fans are assembled packaged units that are ideal for moving large volumes of air out of offices and commercial spaces. They have galvanised steel construction with 5 fabricated steel bladed propellers & regreasable cast pillow block bearings for load support to the rotating shaft, corrosion resistance, durability and withstanding a maximum ambient temperature of 104 degrees F. These fans feature belt drive motors that offer flexibility in terms of rpm speeds, as the motor is not directly in contact with the fan's moving parts. Choose from a wide range of these exhaust fans, available in fan speeds ranging from 354 to 877 rpm.