Exhaust Fan Size For Toilet

The formula to calculate bathroom exhaust fan size reads as follows.

Exhaust fan size for toilet.

The room s size measured in m3 is the most important factor to determine which exhaust fan is suitable for your toilet. Of course this depends on your circumstances so we recommend using our simple exhaust fan calculator to decide which fan you need. For bathrooms less than 100 square feet you can just go with 1 cfm for every square foot of floor area he says. But o brian suggests a simpler rule of thumb.

For example if your bathroom is 80. All you need to do is select the application from the dropdown enter the size of the room and we will provide you with a general capacity range m3 hr that you should be looking to achieve from the extraction fan. An effective bathroom fan should be capable of replacing the entire volume of air 8 times per hour or every 7 5 minutes. A diameter of 4 inches is common for exhaust ducts but some high cfm fans fit a 6 inch diameter duct.

A second fan may be needed. 10ft 10ft 8ft 7 5 106 67 cfm. The vent material smooth vs. If the enclosed space is small a 50 cfm fan should suffice.

How to choose one. If your bathroom has a toilet or shower area enclosed by a door it s a good idea to install a separate exhaust fan for that area. 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. Cubic volume 7 5 cfm necessary.

For example a bathroom with a volume of 1000 cubic feet 28 3 cubic meters needs a fan capable of moving 1000 7 5 or 133 cfm 3 8 cubic meters per minute. By simply inputting into the calculator the dimensions of your room and the type of room application for the fan the calculator will provide you with a suggested general capacity range in cubic metres per hour m3 hr to help narrow down your exhaust. Here s how we get this number. Because toilets are usually in small rooms a small quiet exhaust fan should do the trick.

This fan is described as a sanity saver by homeowners fed up with noisy bathroom exhaust fans. Just remember that the fan needs airflow to do its job. Determine the required cfm for your bathroom fan. The calculator on this page is provided as a general guide designed to help you select an exhaust fan which may be suitable for your needs.

With a power level of 70 cubic feet per minute cfm this fan will handle bathrooms up to 70 square feet in size. Otherwise use the appropriate calculation based on the room size. Why you need to have the proper size extractor fan. To arrive at your required cfm simply divide your bathroom s volume by 7 5.

Bathroom fan exhaust size calculator.