Bathroom Fan Duct Size

Standard fan sizing applies to bathrooms that are 100 square feet or less.

Ceiling fan with light dining room. If your bathroom has an 8 ceiling the cfm rating for your fan should be as least as high as the number of square feet 5 x 7 35 sq. To arrive at your required cfm simply divide your bathrooms volume by 75. A bath vent fan duct that is too short may violate the manufacturers installation instructions may not work properly or may be drafty.

An effective bathroom fan should be capable of replacing the entire volume of air 8 times per hour or every 75 minutes. Determine the required cfm for your bathroom fan. At bathroom vent duct materials.

A bathroom with a higher ceiling would require a larger fan. Also see bath kitchen vent duct sharing. 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.

Bathroom vent fan duct installation routing suggestions begin just below. A bath vent fan duct that is too long may restrict air flow such that the fan is not functional. Ft in the room.

Standard fan sizing. Here we provide specifications for recommended minimum maximum duct lengths for bathroom vent fans. Bathroom vent fan duct materials.

Bathroom exhaust fan duct length specifications. So in your case a 50 cfm fan should work. The fan wont even push the damper open even with the spring on the exhaust damper removed.

Vivosun 6 inch inline duct fan 240 cfm hvac exhaust intake fan low noise extra long 55 grounded power cord. For example a bathroom with a volume of 1000 cubic feet 283 cubic meters needs a fan capable of moving 1000 75 or 133 cfm 38 cubic meters per minute. I installed a 5 duct fan for bathroom exhaust the total length of duct to outside is less than 6 ft.

The duct fan is rated 120 cfm free air. Bathroom vent fans are rated for the amount of air they can move measured in cubic feet per minute or cfm. 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.