25 October 2004
Figure 9-1. Walk-in downdraft paint booth.
Size each plenum take-off for no more than 2.44 m (8 ft) of plenum width (W).
Perforated plate with 9.53-mm (3/8-in) holes. Size open area for an airflow
velocity of 5.08 m/s (1,000 fpm) through holes.
Size 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
Use manufacturer's recommendations for sizing perforated ductwork.
Removable filters and floor grating.