The room area is listed in square feet.
Fan room size. A guideline for sizing ceiling fans has been determined by the American Lighting Association. In a medium sized room we would typically recommend a fan within the 48 to 56 diameter. Larger bedrooms or living areas - approximately 5m x 5m or 25m2 room size -.
Standard rooms vary from 10x10 to 16x16 100 to 256 sq ft and includes large bedrooms living rooms and large kitchens. Install a fan with a 42-inch sweep in rooms up to 144 feet. For rooms less than 144 square feet ceiling fan manufactures provide fans with blade spans of 42 or under.
An example to clear out your confusion-Suppose the CFM of your room is 400 and the room measurements are as follows. This fan is best for medium bathrooms most bedrooms childrens bedrooms and home offices. Powerful fans are significant in cooling rooms of this size.
To determine the square footage of the room or the area multiply the length of the room in feet by the width of the room in feet. Smaller bedrooms or rooms such as an office space - less than 4m x 4m or 16m2 room size - 48 or 122cm ceiling fan or even smaller. This is a good all-purpose fan size that doesnt take up too much room and is easy to install.
Fans for Standard Rooms. The total you receive from this calculation is the size of your room in square feet. To determine the square footage of your bathroom multiply the length times the width.
Use the chart below as a reference to find the right ceiling fan size for your room. The rule of thumb is that you need at least 1 CFM per square foot of room area. Sizing and selecting a Ceiling Mounted Fan.

