CFM stands for cubic feet per minute. It is a term used to describe a fan’s efficiency in terms of airflow.

Calculating the CFM of a room helps when choosing a fan.

**Formula to calculate CFM.**

First, you have to know the volume of the room and how many times you want air to exchange

**Example:**

Suppose you have a room that has a volume of 700 cubic feet, if requires two air turnovers per minute, calculate the CFM of the room.

Therefore, the CFM of the room is 23.3.