Ceiling Fan Size Calculator

This sizes a ceiling fan for a room. Enter the length and width, or an area you already know, and it returns the blade span the room-size guideline calls for, the largest span that still leaves the blade tips clear of the walls, and the downrod length that hangs the blades where you want them. A third action takes a fan's CFM rating and works out how often it turns over the air in the room. The span table is a comfort guideline that makers shade by a few inches; the clearance and the drop are arithmetic on your own figures, and those are what decide whether a fan fits.