Interior design help for everyone.
How to know which size bathroom fan to purchase for your main bathroom, powder room or ensuite bathroom.
How many CFM do I need for my bathroom fan?
Wondering how to calculate which size of fan you need for your bathroom? For a bathroom with a tub or shower, here's the magic ratio!
Calculate the volume of your bathroom:
Height of the room x length of room x width of the room = total volume.
ie. 8' high x 10' long x 6' wide room = 480 cubic feet.
Now divide the cubic feet by 7.5
480 divided by 7.5 = 64 cfm fan size. Or select the closest available fan size, when in between sizes, always select the higher CFM fan. Meaning, if there is a 50 CFM fan and a 75 CFM fan, select the 75 CFM fan.
There you go!
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Jil Sonia McDonald - Interior Designer of Jil Sonia Interior Designs.
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