Abstract: An electrostatic powder coating installation is disclosed, incorporating a spray booth in which there are arranged electrostatically charged powder spraying means whereby the powder spray means may apply a coating of said powder to an article. One portion of the internal walls of the spray booth is provided with a filter which is movable through the booth to a cleaning position outside the booth. The movable filter is arranged within the booth so that one face thereof is exposed to the interior of the booth and the opposite face thereof confronts the intake side of a suction device which is effective through the filter to maintain a slightly negative pressure within the booth. The overspray of powder directed at the article will therefore be attracted to and deposited on the exposed face of the movable filter.

Abstract: The disclosure is directed to a spray booth for electrostatic power coating processes, including a hopper section, and a removably secured housing section. The housing portion consists of a basic skeleton of structural supporting members, to which are removably attached a plurality of standard size panel modules. The panel modules may, for example, be closed wall panels, may include an access door, may provide a sealed access slot for a reciprocating coating applicator, may have louvered air controlled panels, etc. The modular panels may be assembled in various combinations, so that an essentially standard spray booth structure may be easily customized to the specific needs of the user. The spray booth is also constructed and arranged to provide an inwardly shingled relationship of wall forming elements, such that powder overspray tends to fall by gravity into the hopper section of the booth, without contacting any upwardly facing horizontal or near horizontal surfaces.