Gas deflecting and filtering

Claim 1

AIR TREATMENT APPARATUS COMPRISING, IN COMBINATION, A FRAME HAVING AN OPENING DIRECTING A STREAM OF AIR THERETHROUGH, A TRAP SUPPORTED AROUND SAID OPENING, A GAS PERMEABLE CENTRIFUGAL SEPARATOR SUPPORTED WITHIN SAID OPENING DIRECTING AIR ENTRAINED PARTICLES TOWARD SAID TRAP OUT OF A STREAM OF AIR PASSING THROUGH SAID OPENING, SAID FRAME COMPRISING A HOUSING, SAID TRAP COMPRISING A MESH SCREEN SURROUNDING SAID OPENING, FILTER MEANS SUBSTANTIALLY FILLING SAID HOUSING AROUND SAID MESH SCREEN, A COVER PLATE SUBSTANTIALLY ENCLOSING SAID FILTER MATERIAL WITHIN SAID HOUSING, SAID COVER PLATE HAVING PORTS EXTENDING THERETHROUGH FOR MAINTAINING THE INTERIOR OF SAID HOUSING AT ATMOSPHERIC PRESSURE, SAID CENTRIFUGAL SEPARATOR COMPRISING A MOTOR HAVING A DRIVE SHAFT CONCENTRIC WITH SAID OPENING, A SPIDER SECURED TO SAID DRIVE SHAFT, AND A PERFORATE PLATE CARRIED BY SAID SPIDER WITH SAID OPENING HAVING PERIPHERAL PORTIONS ADJACENT TO SAID MESH SCREEN SURROUNDING SAID OPENING,FURTHER COMPRISING FILTER MATERIAL CARRIED BY ONE SIDE OF SAID PERFORATE PLATE FACING THE INWARD FLOW OF AIR THROUGH SAID OPENING, AND WHEREIN SAID PERFORATE PLATE IS SUBSTANTIALLY FLAT.