Bathroom Exhaust Fan Duct Size

Virtually all fans provide more airflow with less noise when the duct is up sized an inch or two when smooth duct is used and when duct runs are as straight as possible. Required bathroom vent fan ventilation rate in cfm this ventilation code specifies a bathroom exhaust airflow rate for toilet rooms and bathrooms not served by a window of adequate size of 25 or 50 cfm ft for hotels motels resorts and dormitories and a slightly more modest 20 50 cfm for private dwellings. The larger the duct diameter the greater the airflow.

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Check the size of the exhaust port on the fan to make sure it fits your ductwork if applicable.

Bathroom exhaust fan duct size. A diameter of 4 inches is common for exhaust ducts but some high cfm fans fit a 6 inch diameter duct. The minimum allowed fan size is 50 cfm so if your bathroom is for example only 42 square feet you still need a 50 cfm fan. Smooth rigid duct delivers better airflow than metal flex duct. For bathrooms less than 100 square feet you can just go with 1 cfm for every square foot of floor area he says.

For example if your bathroom is 80. The duct fan is rated 120 cfm free air. But o brian suggests a simpler rule of thumb. In order to make the vent fan as quiet as possible mount the fan itself as far as possible from the intake register in the bathroom.

The fan won t even push the damper open even with the spring on the exhaust damper removed. Replace 3 duct with 4 or 6 duct. Sizing for large bathrooms for bathrooms over 100 square feet exhaust fans can be sized according to the number of fixtures in the room. I installed a 5 duct fan for bathroom exhaust the total length of duct to outside is less than 6 ft.

The company does not cite a maximum exhaust duct length. A 3 or 4 inch duct connects to the outlet on the fan housing and runs to a side wall or to the roof and connects to a vent cap that allows the exhaust to disperse outdoors. Fantech recommends a minimum of eight feet of insulated flex duct between the exhaust inlet register or grille and the fan motor. The bathroom exhaust ventilation fan disperses air through an opening in the fan housing which is usually 3 inches in diameter and ideally faces in the direction of the ventilation system outlet.

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