The paint booth must be supplied with new, clean air equal to the amount exhausted from the booth. The air sweeps down the room in a unidirectional way, at a velocity generally between 0.3 m/s and 0.5 m/s, and exits through the floor, removing the airborne contamination from the room. I … More specific regulations for each operation may be found in OSHA standard 1910.94(c)(7). Paint Booth Design Review Checklist ACGIH Industrial Ventilation Manual, 27 ... Velocity through air intake openings does not exceed 200 fpm unless exhaust system can accommodate higher velocities (1910.94)? WHAT AFFECTS PAINT BOOTH AIR FLOW? Reply: OSHA currently does not have specific standards addressing velocity requirements for a waterwash spray booth or an enclosed booth with no openings. Question: 29 CFR 1910.107(b)(5) only refers to a dry filter spray booth. Air Velocity - Air Flow Rate in Paint Spray Booth . Cleanrooms using unidirectional airflow are more expensive than non-unidirectional ones, but can comply with more stringent classifications, such as ISO 5 or lower. If air velocity is too low, the spray booth may experience “roll-back” where the overspray bounces back from the filter plenum towards the target product, operator, or booth openings. And in order to Paint polyurethane paint, I need to pull 100 CFM. Overspray collection filters are Class 1 or 2 in accordance with ANSI/UL 900 (NFPA 33)? Any doors that supply this air must be left open during spraying and the velocity may no be more than 200 feet per minute. Can I use 30″ diameter ductwork or do I have to maintain the fan diameter? Full Filters: ... Our AMU’s are not compliant in California because of the Low NOx requirements (Rule 1147). Q. I have a Binks cross draft booth over here, and the industrial hygenist told me that it is pulling 80 CFM right now. Their air flow requirements are summarized below. Adding an AC is possible, but it is very expensive to do that for a paint booth. What is the minimum air velocity requirement for a waterwash spray booth or an enclosed booth with no openings? The three main styles of paint booths are cross draft, down draft, and side down draft paint booths. Reply. Insufficient air velocity can result in the discharge of overspray outside of the spray booth's footprint. Jim Long says: July 19, 2016 at 8:47 pm I have a 40″ diameter exhaust fan. The booth is 25'x14'and has a 5 horsepower exhaust motor 1735 rpm. Insufficient air velocity can result in the discharge of overspray outside of the spray booth’s footprint. 10. In the past NFPA dictated paint booth air flow needed to be 100 FPM for non electric static coating application, downdrafts were usually between 50 – 100 FPM. However, 1910.94(c)(6)(ii) requires … The air may not be heated from within the booth. If air velocity is too low, the spray booth may experience "roll-back" where the overspray bounces back from the filter plenum towards the target product, operator, or booth openings.