HOW TO DETERMINE THE SIZE OF FAN FOR YOUR BATHROOM :

Determine the right size of the fan for your bathroom by calculating the CFM (cubic feet per minute) of the bathroom , which means minimum airflow needed to achieve 8 air exchange per hour , The formula to calculateCFM is

• CFM = Volume / 7.5 where volume x Width x height (of the Bathroom)

Thus a Bathroom that is 10 feet wide and 10 feet high has :

• Volume = 10 x 10 x 10 = 1000
• And, CFM = 1000 / 7.5 = 133.33
• Thus any fans listed as 134 or Higher is good for this bathroom