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Ask the Expert Question-and-Answer Archive by Ron Joseph June, 2005 Paint Spray Booth Filter Stages Q. Just out of curiosity, if your new booth is designed with a 3-stage filtration system which meets EPA Method 319 requirements, do you need a differential pressure gauge installed across each filter stage or will a single pressure gauge across the entire booth meet the requirements under the Aerospace Industries NESHAP Rule. A. I have always taught that a single measurement across all three filters is adequate, but a few weeks ago I met someone who told me that his state agency was requiring his facility to measure the pressure differential across each filter stage. I have no idea why anyone would need to do that as individual measurements have absolutely no beneficial environmental impacts. If I were you, I would check with my state agency to see how they interpret the NESHAP or Title V permit. Best wishes,
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