Bathroom Fan Duct Length

Bathroom and 70 ft. Fantech recommends a minimum of eight feet of insulated flex duct between the exhaust inlet register or grille and the fan motor. Duct length is calculated with the same formulas used to develop 2015 irc table m1506 2 and 2018 irc table m1504 2 i e the darcy weisbach colebrook equations.

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Of duct equivalent length you ll need a 110 cfm fan to achive the recommended 8 air changes per hour.

Bathroom fan duct length. Every little roughness on the inside of the duct makes it harder to get air to flow so flex duct with ridges on the inside is twice as long as smooth ridged ducting at. Once you ve got all the information it s time to select an appropriately sized fan. What is the maximum duct length from a bathroom fan. 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.

The company does not cite a maximum exhaust duct length. To do this you can use a chart like this. The basics of venting a bathroom exhaust fan. 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.

Assumptions are consistent with these tables i e 15 for elbows 30 for a termination fitting standard temperature and pressure and roughness factors of 0 0055 for flex ducts and 0 00038 for smooth ducts. The photo shows a few examples of what we call equivalent duct lengths how long a duct appears to the fan motor. 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. Using this chart you ll find that for a 640 cu.