What is the diameter of a fan?
If your fan has an odd number of blades, measure the distance between the tip of the blade and the center of the fan to determine its radius. Then, multiply that number by two to determine the diameter. Measure the distance from the tip of one blade to the center of the fan and multiply by two. This measurement gives you the ceiling fan diameter and helps determine if it’s suitable for your room.The front fan has the same number of blades and is the same diameter at 118 inches but it runs around six per cent faster.Fans come in standard sizes, with 120mm case fans being the most common in use today. That 120mm measurement is the distance from one side of the fan’s body to the other. The actual blade diameter on a typical 120mm fan is 110mm, and the mounting holes are 105mm apart.