Calculating Cfm For Bathroom Exhaust Fan

Another method assumes you have eight foot ceilings. Divide the volume of your bathroom in feet by 7 5.

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To arrive at your required cfm simply divide your bathroom s volume by 7 5.

Calculating cfm for bathroom exhaust fan. For example a bathroom with a volume of 1000 cubic feet 28 3 cubic meters needs a fan capable of moving 1000 7 5 or 133 cfm 3 8 cubic meters per minute. The final answer is the minimum cfm rating for the fan. For instance if a bathroom is 10 feet long 8 feet wide and 9 feet tall the volume of the room is 720 cubic feet.

Alternately you can determine the cfm by dividing the total volume. An effective bathroom fan should be capable of replacing the entire volume of air 8 times per hour or every 7 5 minutes. Simply enter the dimensions of your bathroom in the calculator below to determine the minimum size vent fan you need for the bathroom in your home.

Using a tape measure calculate the total volume of your bathroom by multiplying. So divide 4 032 by 60 for minutes in an hour for the desired cfm rating for the exhaust fan which in this case is rounded up to 68. In this case multiply your bathroom s length by its width to determine its square footage and multiply it by 1 1.

Determine the required cfm for your bathroom fan. How to calculate the cfm of a bathroom fan step 1. Use a tape measure to measure the length width.

Next use your dimensions to calculate the total volume of your bathroom. When installing a vent fan make sure there s at least a 1 2 gap under the bathroom door to allow fresh air to enter the room when the fan is running. Calculate how many cfm your bathroom fan needs by dividing the number from the step 2 by.

To calculate the minimum cubic feet per minute rating needed for an exhaust fan multiply the bathroom s length width and height and then multiply that result by 0 13. How to size an exhaust fan for a bathroom measure the dimensions of your bathroom. Check the cfm.

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