The 6 inch clip on fan has impact resistant plastic grills with chemical resistant polypropylene blade, 2-speed and 1/300 HP motor. The 12 in, 16 in and 18 in fans oscillate 90 degree or can be locked in non-oscillating position. They also have powder coated steel front grill with impact resistant plastic rear grill and chemical resistant polypropylene blade. 12 in fan has 3-speeds and a 1/50 HP motor. 16 in fan has 3-speeds and a 1/20 HP motor. 18 in fan has 3-speeds and a 1/20 HP motor.