Gas filter assembly

Claim 1

A gas filter assembly of modular construction comprising a rectangular duct having a pair of rails on opposite inner sides thereof, a rectangular cell frame slidable along said rails, said frame comprising a wall bent at one end to form a reentrant slot receiving said rails, a plurality of medium efficiency filter bags disposed within said cell frame and individually removable therefrom for replacement purposes, each of said bags having attached at its mouth a collar comprising a pair of elongated thin chipboard members with a central portion and with end tab portions pivotally connected to said central portion manipulable long clips holding the central portions of each collar member to the adjacent central portion of the next bag of the assembly and manipulable long clips holding the central portion of the collar members of the outermost two bags of the assembly to the adjacent wall of said frame, and manipulable short clips holding the tab portions at the ends of the respective collars of each bag to each other and to said wall of said frame, thereby to provide a modular assembly having a plurality of generally symmetrical rectangular open mouth bags each of which is closely disposed to an adjacent bag and independently removable from said frame.