Exhaust Fan Vent Size

A 901 to 1200 cfm fan requires an 8 inch minimum and a 10 to 12 inch duct is recommended.

Exhaust fan vent size.

The floor to ceiling walls prevent air from circulating to an enclosed shower or a toilet no matter the size of the fan in the main part of the bathroom so it s best to install an additional small. At 1200 cfm and. Stephen paul many stoves come with their own hoods and the hood is usually the right size for the stove. However you don t want the hood to be too low or it will get in the way so 24 inches above the cooking surface is the recommended distance.

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. 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. 1500 60 25. 25 8 200 cfm rated vent fan.

The minimum requirements say that this air should be changed 15 times an hour. 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. For example a 10 wide by 15 long bathroom with a 10 ceiling would need. 3 x 320 cfm 960 cfm to be vented.

A pressure differential between the duct and the atmosphere will cause the water level in the manometer legs to rest at different levels. You multiply length times width times height. For that air volume 8 diameter vent ducts are close to their limit and 10 is indeed preferable. A 601 to 900 cfm fan requires a 7 inch minimum but an 8 to 10 inch duct is recommended.

Add an additional 20 cfm x 1 20 if you have a steep roof and 15 cfm x 1 15 for a dark roof. 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. The exhaust fan drawing below illustrates how static pressures are measured in ductwork with a manometer. Attic vent fans are commonly rated from 800 to 1 600 cfm making one fans suitable for attics of up to around 2 200 square feet.

This difference is the static pressure measured in inches of water gauge. Vent hoods should be close to 24 inches above the cooking surface. Attic x 0 7 700 cfm minimum fan rating.