Bathroom Exhaust Fan Size Calculator

The rule of thumb is that you need at least 1 cfm per square foot of room area.

Bathroom exhaust fan size calculator. For example if your bathroom is 6 feet wide and 9 feet long its square footage is 54. For a standard 10ft by 10 ft bathroom with an 8 ft ceiling you will need an exhaust fan capable of 106 67 cfm. Standard fan sizing applies to bathrooms that are 100 square feet or less. Building code does not specify bathroom vent locations but in any size bathroom it is the most logical to install it over or as close as possible to the plumbing fixture that requires it.

Any newly installed exhaust fan ducts must be sized according to these sizing specifications. Enter bathroom height step 4. To get the total square footage multiply the length of your bathroom by its width. Toilet 50 cfm shower stall 50 cfm whirlpool 100 cfm 200cfm bathroom exhaust fan.

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. Enter bathroom width ft. Press calculate minimum suggested bath fan cfm. 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.

Commercial exhaust fans vent air from your kitchen to the outside. Bathroom vent cfm calculator uses 3 stage formula located below. Simply enter the dimensions of your bathroom in the calculator below to determine the minimum size vent fan you need for the bathroom in your home. Here s how we get this number.

The formula to calculate bathroom exhaust fan size reads as follows. Suggested cfm for the bathroom is based on cycling all the air in the bathroom 8 times per hour. When installing a vent fan make sure there s at least a 1 2 gap under the bathroom door to allow fresh air to enter the room when the fan is running. A bathroom fan is an essential piece of hardware in any indoor bathroom without a window.

The bath fan calculator is standard guide to help you find the minimum fan rating for your specific bathroom. Cooking soil then i swivel fan 24 7. A fan s power is measured in cubic feet per minute so you might think that the next step would be to. 10ft 10ft 8ft 7 5 106 67 cfm bathroom fan exhaust size calculator.

The exhaust fan removes. A very quiet bathroom fan that will just make a gentle whoosh is a fan at 1. Bathroom vent fans are rated by the cubic feet per minute cfm of air they move and should be. This fan calculator is typically used to calculate the cfm or cubic feet per minute of air exchange that may be desired in a building.

To determine the square footage of your bathroom multiply the length times the width.