Abstract: An oven apparatus has an oven enclosure with a heating zone and has two fans that remove air from the heating zone during purging and during normal operations. One of the two fans, called the exhaust fan, is a fixed speed fan in some embodiments. The second fan is a variable speed fan in some embodiments. The oven apparatus may have a vestibule at a conveyor opening with a fan dedicated to exhausting the vestibule. The oven apparatus may have an air seal between the vestibule and a heating zone of an oven chamber.

Abstract: A paint spray booth is provided which comprises a floor covered with flowing liquid, the floor including an elongated passageway formed therein defined by a pair of passageway walls and having an entrance opening and an exit opening. The paint spray booth further comprises a mechanism for exhausting air from the booth and pulling a stream of paint particle laden air downwardly through the openings. The booth further comprises a first longitudinally extending concave plate positioned to receive the mixed stream of water and air exiting from the exit opening, and a second longitudinally extending concave plate laterally spaced from the first concave plate. The first and second concave plates cooperate to define a flow chamber therebetween and a discharge opening. The first and second plates are designed to minimize paint buildup in the flow chamber and to trap the noise generated at the discharge opening to reduce the amount of noise returning through the passageway.