Filter and filter assembly

Claim 1

A filter assembly for gaseous media comprising a plurality of filter elements retained in a lattice structure; each filter element comprising a quantity of filter material for a gaseous medium formed into the shape of a panel, a rectangular frame surrounding the edges of the panel and retaining the filter material, and a peripheral rim of thin section projecting from the rectangular frame and lying parallel to the direction of flow of gaseous medium through the element when in use; the lattice structure defining a number of rectangular openings equal to the number of elements, one element being located over each opening, the structure comprising a number of lengths of channel-section material defining first channels having side flanges. In a number of joint members each composed of at least two pieces of sOcketsection material joined together to form sockets set at right angles to each other in one plane and defining second channels having side flanges, the socket-section material being of lager channel section than the first channels and such size as to allow the said first channels to slide into the ends of the joint members and defining rectangular openings in the lattice structure, the second channels having the ends of the flanges turned in to embrace the edges of the flanges of the said first channels, resilient seating means at the bottom of and within each of the first channels upon which the rim of an element may seat, and quick clamping means mounted on each joint member to clamp the corner of each filter element located at an adjacent opening to press the edge of the rim into the resilient seating means to form an airtight joint.