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", 16" and 18" fans oscillate 90° 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" fan has 3-speeds and a 1/50 HP motor. 16" fan has 3-speeds and a 1/20 HP motor. 18 " fan has 3-speeds and a 1/20 HP motor. All fans have a one year warranty.