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In conventional dry spray
booths, overspray dry filters or filter rolls, if installed, shall conform to the
requirements listed here and on the next screen.
- Based on NFPA 33-1969, all spraying operations except electrostatic
spraying, shall be designed, installed and maintained so that the average air velocity
over the open face of the booth (or booth cross section during spraying operations) shall
be not less than 100 linear feet per minute (fpm). Electrostatic spraying operations may
be conducted with an air velocity over the open face of the booth of not less than 60 fpm.
This rule pertains to hazards that effect fire protection and the removal of flammable vapor
accumulation in a spray booth during spray operations. The concentration of flammable
vapors should be kept below the lower explosive limit.
- Visible gauges or audible alarms or pressure-activated devices shall be installed to
indicate or ensure that the required air velocity is maintained. Filter rolls shall be
inspected to insure proper replacement of filter media.
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