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The old standard was 100 linear feet per minute (lfm), and this is still stated in the International Fire Code (IFC). This air velocity is calculated with the spray paint booth empty and using a cross-sectional area of the air flow direction. The more current codes require a minimum of 4 air exchanges per minute for wet or solvent-based paints. Powdercoat booths are required to have 60 lfm.
The station air volume, expressed cubic feet per minute (CFM), is the product of the air velocity through the airflow. station and the station area in square feet (Ft2). Station Air Volume (CFM) = Air Velocity (FPM) x Station Area (Ft2) CONVERSION CHART. VELOCITY PRESSURE in inches of water to VELOCITY in feet per minute. Calculating Air Velocity. Fechheimer Pitot airflow stations and traverse probes measure in the same manner and magnitude as the Pitot tube, via separate signals of airstream total pressure and static pressure, in inches water column (IN w.c.).