Abstract: A grease extraction cartridge for a kitchen exhaust ventilator is removably disposed along a flow path through the ventilator for normally forming a fire wall, while being readily removable from the ventilator to permit access to the interior of the ventilator for purposes of cleaning and maintaining the device.

Abstract: The invention provides for easy, efficient repair and maintenance of cooling towers by a design in which the internal elements such as liquid distribution pipes, demister, grating and the like are structurally unified with a supporting means so that they can be removed from or replaced in the tower as a unit.

Abstract: In an air cleaning device including a wash section wherein the wash section comprises a housing having front, rear and lateral side walls to define a passageway. Within the passageway and secured to opposite facing walls thereof is a pair of removably, adjustably arranged baffle members arranged in spaced apart relationship to form a venturi passage therebetween. Above the pair of baffle members but within the passageway and secured to a wall thereof is located a wash liquid discharge chamber arranged to discharge wash liquid downwardly onto a baffle plate member whereby the wash liquid issues across the entire width of the wash section in substantially a planar sheet of liquid to meet the contaminated air stream.