Exhaust Fan Size For Toilet

Here s how we get this number.

Exhaust fan size for toilet.

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. 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. The room s size measured in m3 is the most important factor to determine which exhaust fan is suitable for your toilet. The fan model its size and cfm rating or the required or design flow rate in cfm from your local code such as 60 or 80 cfm.

The formula to calculate bathroom exhaust fan size reads as follows. An effective bathroom fan should be capable of replacing the entire volume of air 8 times per hour or every 7 5 minutes. For bathrooms less than 100 square feet you can just go with 1 cfm for every square foot of floor area he says. To arrive at your required cfm simply divide your bathroom s volume by 7 5.

Bathroom fan exhaust size calculator. With a power level of 70 cubic feet per minute cfm this fan will handle bathrooms up to 70 square feet in size. A diameter of 4 inches is common for exhaust ducts but some high cfm fans fit a 6 inch diameter duct. 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.

A second fan may be needed. For example if your bathroom is 80. Why you need to have the proper size extractor fan. 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.

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. 10ft 10ft 8ft 7 5 106 67 cfm. Of course this depends on your circumstances so we recommend using our simple exhaust fan calculator to decide which fan you need. The vent material smooth vs.

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. But o brian suggests a simpler rule of thumb. How to choose one. Because toilets are usually in small rooms a small quiet exhaust fan should do the trick.

This page is designed to be a general guide for selecting an exhaust fan based on the size of the room and the type of application the fan will be used for. Determine the required cfm for your bathroom fan. Otherwise use the appropriate calculation based on the room size. If the enclosed space is small a 50 cfm fan should suffice.

Just remember that the fan needs airflow to do its job.