Each air circulator model includes a completely enclosed and permanently lubricated, split capacitor, ball bearing motor. The motor allows you to choose two different speed to best fix your preferences. Additionally, this air circulator includes coated steel guards that will keep any objects from hitting the blades. The pedestal model offers column adjustments from 52" to 78" and bolts to a 27" dia steel dome base that consist of 56 carriage bolts. Every air circulator has a head tilt of 30° downward as well.