Abstract: A self-cleaning collecting device for cleaning a dirty gas stream including a flow-through housing having a dirty gas inlet at the base of the housing and a clean gas outlet at the top of the housing interconnected by a gas treating passage adapted to direct a gas stream vertically through the housing. As the dirty gas stream enters the housing, it is circulated through a liquid bath where noxious vapors and larger particulates are entrained in a mist of liquid droplets which are in turn captured and removed from the gas stream as it moves through a separating panel positioned above the liquid bath. As the gas flows upwardly out of the panel, the captured liquid is circulated to the liquid bath to maintain a flow of liquid within the panel which acts to continuously wash the particulates from the panel.

Abstract: A dust collector forming vertically oriented filtering panels with downward flow of dirty gases and a quiet zone below the panels for trapping particulates of dust that have been separated from the gases and passed into the quiet zone.

Abstract: A weather louver for separating particles from a gaseous medium and primarily to separate mist and droplets of moisture from an air stream. This device includes parallel passages with moisture traps and collectors having drainage troughs to separate the moisture from the air.

Abstract: An invertible corner connecting clip is disclosed having an out-corner unit and an in-corner unit connected together in spaced parallel right angle relation to define pockets for receiving side walls of main and cross support members of a ceiling latticework. The out-corner unit has upper and lower horizontally extending relieved areas to enable the clip to be inverted and used to complete either a right or left-hand corner and a tactile indicator to identify proper orientation of the clip for installation.

Abstract: An air volume control ventilation system which minimizes variation in air volume flowing through the system has a fan for drawing air through fixed-resistance filter means including a roll filter, an electrostatic filter, and a high efficiency filter; a variable-resistance volume control damper operated, when an actuator therefor is energized in opposite directions, to open and to close and thus vary the volume of air flowing through the system; and a differential static pressure switch connected across the fan and being provided with a normally open high limit set of contacts adapted to close and complete a circuit to open the damper when the differential pressure across the switch rises to a first predetermined limit and also a low limit set of normally open contacts adapted to close and complete a circuit to shut the damper when the differential pressure falls below a second predetermined limit, whereby the damper is alternately open and shut and the differential pressure across the fan is maintained withi

Abstract: A filter supporting and sealing arrangement including a filter support grid having support beams with each beam defining parallel channels carrying a fluid sealant. The grid defines filter openings receiving filters with peripheral flanges on each filter forming a knife edge received in the fluid sealant of the channels for sealing the filter when it is in the normal operating position.