Must the average velocity range be no lower than Table G-10, while concurrently maintaining the 100 foot per minute (fpm) average requirement?
Reply: Table G-10 of 1910.94(c)(6)(i) specifies the required airflow velocities ranging from 50 to 250 linear foot per minute (fpm) into the openings of a spray booth for various operations and designs, except where a spray booth has an adequate air replacement system. The standard 1910.107(b)(5)(i) is specifically for dry type overspray collectors, which are required to maintain the average air velocity of 100 linear fpm over the open face of the booth or booth cross section during all spraying operations except electrostatic spraying. Question: 29 CFR 1910.107(b)(5) only refers to a dry filter spray booth. What is the minimum air velocity requirement for a waterwash spray booth or an enclosed booth with no openings? Reply: OSHA currently does not have specific standards addressing velocity requirements for a waterwash spray booth or an enclosed booth with no openings. However, 1910.94(c)(6)(ii) requires that the vapor concentration in all area of the booth remain at a level below 25
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