Bathroom Exhaust Fan Vent Pipe Size

3 x 320 cfm 960 cfm to be vented.

Bathroom exhaust fan vent pipe size.

You can upgrade to a larger diameter duct for greater efficiency or you can use an adapter reducer often included with the fan to fit the smaller duct. 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 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. If your bathroom has a higher ceiling multiply the width x length x height of the room divide by 60 minutes in an hour then multiply by 8 number of air exchanges per hour.

Why your bathroom should have an exhausting vent fan bathroom venting fans are about more than just eliminating noxious odors. For that air volume 8 diameter vent ducts are close to their limit and 10 is indeed preferable. The bathroom has a separate toilet room. A diameter of 4 inches is common for exhaust ducts but some high cfm fans fit a 6 inch diameter duct.

100 cfm fan with a 4 exhaust port and back flow flap. 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 second fan is 150cfm with the ability to have a 4 or 6 vent pipe attached. 25 8 200 cfm rated vent fan.

Therefor there are two fans. If i can find a y pipe with a 4 and a 6 entry what size should the exit pipe be. The basics of venting a bathroom exhaust fan. 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.

For example a 10 wide by 15 long bathroom with a 10 ceiling would need. Your inline exhaust fan has to thus be have a 960 cfm capacity before allowing for losses due to duct size bends material restrictions in air flow and duct length. 1500 60 25.