Filter for air purificn., contg. replaceable filter cloth - which is reinforced by grid made of metal wire, and can easily be placed in or removed from filter frame

摘要

The filter is stable and consists of a frame(2), which can be placed in walls, ceilings or filter casings. In frame(2) is a corrugated cloth sheet(1) projecting by a distance(5) of 10-15mm. beyond all four edges of a reinforcing grid(3), so the cloth(1) can form a seal in frame(2). Grid(3) has mesh size 12.5 x 25mm. and is made from metal wire 0.5mm. dia., which is coated with zinc or otherwise protected against oxidn. In the middle of frame(2) is a traverse(4) made of Zn-coated metal strip with a cross-section of 0.75mm. x 50-80 mm.; and frame(2) is made from four U-channels with edges folded inwards to increase rigidity.