BAG-TYPE AIR FILTER DEVICE, AND FILTRATION MATERIAL AND FILTRATION MATERIAL FRAME FOR THE DEVICE

摘要

An air filter device (1) in which a bag-like air filter filtration element can be replaced. The air filter device (1) includes a bag-like air filter filtration material (2) having a gas inflow opening and having a fixing peripheral section (7) in the periphery of the gas inflow opening, an annular filtration material reception member (4) having an annular cavity (13) for receiving the peripheral section of the filtration material, and a filtration material hold-down member (5) provided in the annular cavity of the filtration material reception member (4) and elastically deformable, the filtration material hold-down member (5) being constructed such that the peripheral section of the filtration material is held between the filtration material reception member and the filtration material hold-down member to fix the filtration material and that the peripheral section of the filtration material is freed from the filtration material reception member and the filtration material hold-down member.