25 October 2004
Figure 9-3 Drive-through crossdraft paint booth with no
Mechanical replacement air
Size each plenum take-off for no more than 2.44 m (8 ft) of plenum width. Size
the exhaust plenum for a maximum plenum velocity of 5.08 m/s (1,000 fpm).
Size replacement air plenum for a maximum plenum velocity of 2.54 m/s (500
Perforated plate with9.53-mm (3/8-in) holes. Size open area for an airflow
velocity of 10.16 m/s (2,000 fpm) through holes.
Paint Spray Booth Exhaust Filtration System. There are two types of
exhaust air filtration systems. The first type is a water wash system. A water curtain is
created at the exhaust plenum by a pump providing continuous circulation of water.
The second type is a dry filter system, where the exhaust air passes through filter
media. Consider the following.
a. Do not design or purchase the water wash paint spray booths. The
water wash system requires more energy to operate than the dry filter
system. The wastewater must be treated and the hazardous constituents
removed (often at great cost to the generating facility) before it may be
discharged to a municipal treatment plant.