How To Determine Cfm For Bathroom Exhaust Fan. In order to calculate the necessary CFM value you should divide bathrooms volume by 75. Use these tips to get the sizing right.
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Remembering that the recommended ACH for bathrooms is 8 the exhaust fan needs to ventilate 504 cubic feet x 8 which equals 4032 cubic feet in one hour.
In this case use manufacturer instructions to troubleshoot and repair the fan. Ad Shop bath fans at a reasonable price. For bathrooms 50 square feet and smaller its recommended you purchase a bath fan designed for small rooms. A 50-square foot or smaller bathroom needs a 50 CFM fan.
