An exhaust fan has a flow rate of 20 CFM. How much air would it move if left on for an entire day?

To calculate the total volume of air moved by the exhaust fan over an entire day, the flow rate needs to be multiplied by the number of minutes in a day. The exhaust fan's flow rate is 20 cubic feet per minute (CFM).

Firstly, there are 1,440 minutes in a 24-hour day (24 hours × 60 minutes per hour). Thus, the formula for the total air movement is:

Total Air Movement = Flow Rate (CFM) × Time (minutes)

Total Air Movement = 20 CFM × 1,440 minutes

Total Air Movement = 28,800 cubic feet.

This calculation confirms that if the exhaust fan operates continuously for 24 hours at a flow rate of 20 CFM, it will move 28,800 cubic feet of air. This illustrates the concept of airflow over time and the significance of understanding both the flow rate and duration when assessing ventilation systems.