Spray Booth Fan Size Calculator

Or at 150fpm 12000cfm.

Spray booth fan size calculator.

Important codes that paint booths comply with include national fire code 1 nfpa 33 osha and a few others. We sell fans designed specifically to meet the demands of paint spray booths. This means a booth 10ftw x 8ft tall 80squft moving at 100fpm will require a 8000cfm fan. From your question is it not clear what you mean by semi downdraft booth.

As the filters fill up with over spray the exhaust fan must work harder to remove the air through those filters and out of the booth. Paint gives off voc s that pose a fire hazard and create health and environmental problems. Your booth would be 12 x 12 x 100. Whether exhausting air or bringing fresh air into a structure the calculation produced should help to figure out the size of fan s required to accomplish the air exchanges needed.

The less air moved the more likely over spray will land on your product. Why paint booth cfm is important paint booths are designed to meet a minimum air flow requirement to be compliant with national codes that govern spray booths. The important thing is that to meet code. Does not matter how long the booth is just keep the cross section down.

The speed of the air that you should move through the booth is 100 feet per minute fpm. A 16 fan will not move that kind of air. With the same amount of air being pushed into the booth but now a lower cfm being pulled through clogged air filters the booth is over pressurized. Multiply the booth s face area by 100 feet per minute to achieve cfm.

The correct way to size a fan for a booth is to move the air across the product at about 100 to 150 ft min. One hundred feet per minute is the guideline for air movement in the booth area. For a good overview of all paint booth code compliance check out this article. Many spray equipnment companies regard a downdraft booth to be a large booth and they design for the 50 ft min target.

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. If you re spraying paint you need fans. Using the example from above 80 square feet multiplied by 100 feet per minute equals 8 000 cfm. The fan should be about twice that size and have about a 15 000 cfm at 1 sp rating.

This is the size of the fan needed.