Abstract: A cleaner for air distributing duct systems of buildings has a motor driven fan for developing a vacuum for the suction of contaminants and air from the interior of the ducts and for forcing the obtained contaminated air stream under positive pressure, relative to the ambient, through multiple stages of filtration. The filtered air is discharged locally within the building. Measurement and display of the vacuum and prefilter air pressures indicate to an attendant the status of the cleaner operation and the condition of the air filters. A viewing window allows observation of the contaminated air stream and the prefilter. A pneumatically driven agitator of multiple whips is introduced into the duct system to dislodge adhering contaminants from the interior walls of the ducts. The vertical stacking of modular subunits gives access for servicing each stage of filters and provides roll-about portability of the cleaner.

Abstract: A modular facility for on-site erection at work places and recreation areas is provided in kit form of expendable components for temporary periods of bathing, permitting users to transmit through privacy compartments including an entry "dirty" booth, an intermediate shower booth, and an exit "clean" booth. The facility is serviced by a portable shower and waste water filtration subsystem that operates solely on the flow of an input pressurized supply of water. Filter elements are removeable to recover particles and contaminants from the waste water of shower bathing.