Comparing this to a normal walking pace of 3-4 miles per hour shows that no spray paint booth … Your paint booth manufacturer should meet OSHA in all of its paint booths … To know how long you can run the booth before running out of heated air you calculate the cfm of a booth by taking the width x height x 100 for a cross draft or length x width x 50 for a downdraft, this will give you the approximate cubic feet a minute draw of the booth. CFM Calculator: File Size: 465 kb: File Type: pdf: Download File. CFM Calculator. Air velocity of 100 lfm calculates to 1.1 miles per hour. Contact Schedule Service Request a Quote ... Equipment Repair Filters Installation Layout Builder Lift Inspections Paint Booth … A paint booth should move enough CFM to both produce good paint jobs and meet OSHA requirements of 80-100 feet per minute. For example, if your booth is 16 feet wide by 14 feet tall and is a crossdraft design, typical velocity in the booth would be 100 feet per minute (fpm). The total flow through the booth would be 22,400 cubic feet per minute (CFM… From the design velocity you can calculate ventilation flow rates and air changes. OSHA requirements take into account the booth space, the CFM, and the draft pattern. A concern of some new spray paint booth owners has been ‘my spray booth is a tornado’. 10321 Veterans Memorial Dr, Houston, TX 77038-----Join Our Email List.