The 6 in clip on fan has impact-resistant plastic grills with a chemical-resistant polypropylene blade, 2 speed and 1/300 HP motor. The 12 in, 16 in and 18 in fans oscillate 90? or can be locked in a non-oscillating position. They also have a 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.