Air purifier construction

Claim 1

AN AIR PURIFIER COMPRISING, A CASING HAVING UPSTANDING FRONT, REAR AND SIDE WALLS, AND GENERALLY PARALLEL TOP AND BOTTOM WALLS, SAID BOTTOM WALL BEING FORMED WITH AN ENLARGED AIR INLET OPENING, FLANGE MEANS FORMED ON THE INSIDE OF SAID FRONT, REAR AND SIDE WALLS ARRANGED GENERALLY PARALLEL TO SAID TOP AND BOTTOM WALLS, A PLURALITY OF SPACED DOWNWARDLY EXTENDING ROD FIXED TO SAID FLANGE MEANS, A GENERALLY FLAT SHEET METAL HOUSING FOR HOLDING ACIVATED CHARCOAL EXTENDING ACROSS SAID OPENING AND HAVING PERFORATED UPPER AND LOWER WALLS, SAID HOUSING BEING PROVIDED WITH OUTWARDLY EXTENDING FLANGE MEANS HAVING A PLURALITY OF APERTURES FORMED THEREIN, SAID HOUSING BEING POSITIONED WITH THE THREADED RODS EXTENDING THROUGH SAID APERTURES, A SHEET METAL GRILLE OF APPROXIMATELY THE SAME CROSS-SECTION AS SAID HOUSING AND EXTENDING BENEATH SAID HOUSING, SAID GRILLE BEING PROVIDED WITH OUTWARDLY EXTENDING FLANGE MEANS HAVING APERTURES FORMED THEREIN FOR RECEIVING SAID THREADED RODS, FILTER PAD MEANS POSITIONED BETWEEN SAID HOUSING AND SAID GRILLE, AND MEANS THREADED ONTO SAID THREADED RODS COMPRESSING THE EDGES OF SAID FILTER PAD MEANS BETWEEN THE GRILLE FLANGE MEANS AND THE HOUSING.