In a full downdraft enclosed booth, the filtered air also enters through the roof of the booth and exits along both side walls at or near the floor through the paint overspray arresting filters. At least two (2) exhaust fans are required for this type of booth.
In a floor down draft enclosed both, filtered air also enters through the roof of the booth and exits through paint arresting filters either through a raised floor within the booth or through a pit built into the floor. These are the best but also the most expensive types of booths.
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Side down draft booth