Air cleaner

Claim 1

An air cleaner for removing airborne contaminants in a room, comprising, a housing adapted to be hung from a ceiling or mounted to a wall and defining a linearly elongated duct of rectangular cross section, a low efficiency filter mounted spanning said duct at one end thereof, a high efficiency filter mounted spanning said duct on the side of said low efficiency filter toward the opposite end of said duct from the end at which said low efficiency filter is mounted, said high efficiency filter having an efficiency of at least about 93 percent of the ASHRAE Discoloration Test Method (Standard 52-68), a centrifugal blower mounted within said duct on the side of said high efficiency filter opposite said low efficiency filter, said blower having an axis of rotation which is perpendicular to the direction of elongation of said housing and having intake and discharge orifices, baffle means mounted to said housing for isolating said intake and discharge orifices of said blower, said baffle means including a substantially planar panel closing said duct at the end thereof opposite said low efficiency filter and having an orifice therein, means detachably securing said panel to said duct, said blower having said discharge orifice engaging said panel at said panel orifice through which said discharge orifice of said blower discharges in a direction substantially coinciding with the direction of flow of air through said duct, a directional air diffuser mounted across the path of discharge of said blower, and means mounting said blower and said air diffuser to said panel for removal therewith as a unit from said housing.