Energy star makes the following recommendations for ceiling fan diameter.
Ceiling fan size for room size.
Leave at least 2 or 3 feet of space between the end of the fan blade to the closest wall to determine the largest size fan you can put in a room 3 feet for ceilings 9 feet or less 2 feet for higher ceilings.
Fans for great rooms.
Ceiling fans between 42 and 48 inches most ceiling fans are between 42 and 48 inches in size and that they work well for spaces from 75 to 175 square feet.
Rooms up to 75 sq ft 29 in 36 in rooms 76 sq ft 144 sq ft 36 in 42 in rooms 144 sq ft 225 sq ft 44 in.
Ceiling fans with diameters of 56 or larger are the latest trend for gentle steady air circulation in large rooms like great rooms basements and open floor plans.
This is called the sweep or the blade span of the fan.
In terms of sizing your ceiling fan for your bedroom there are two common size options for bedrooms.
If you have a regular sized bedroom of 144 to 225 square feet then a medium ceiling fan with a blade span of 44 to 50 inches will be a great fit.
For rooms between 75 and 144 square feet your ceiling fan should have a diameter of 36 to 42 inches.
For safety the bottom of the fan needs to be at least 7 feet above the floor.
A small 10 x 10 room could accommodate a 48 to 72 fan.
For these we recommend 50 to 58 ceiling fans.
Standard rooms vary from 10 x 10 to 16 x 16 100 to 256 sq ft and include large bedrooms living rooms and large kitchens.
For rooms 75 square feet or smaller your ceiling fan should be 36 inches 91 4 cm or less in diameter.
A guideline for sizing ceiling fans has been determined by the american lighting association.
Ft use a 52 inch or larger fan.
Fans for standard rooms.
There are two ways to determine this number and it depends on the number of blades on the fan.
When looking for the best fan for large rooms a good rule to follow is for any room larger than 300 sq.
Conversely spaces in the home with limited ceiling to floor height think bedrooms offices breakfast nooks etc require a low profile or flushmount ceiling fan.
Powerful fans are significant in cooling rooms of this size.
36 48 and so on.
Measure from floor to ceiling to determine mount type flush downrod standard for the intended location.
You will want to check your fan to ensure that its cfm rating is anywhere between 1 600 and 4 500.