What Size Fan Do I Need? BIGGER IS BETTER: The main cooling effect is felt from directly beneath a ceiling fan and drops off dramatically within about 1 foot from the blades. If the fan is in the middle of the room with seating off to the side, use as large a fan as you can handle that has the highest wind speed (refer to our MPH ratings). If the seating is directly beneath the fan, use a fan large enough to cover the seating area. Read more about: "How To Choose The Right Size Ceiling Fan" or Talk To A Ceiling Fan Expert: 1-800-201-1193.