Respirator main and ancillary filter - are accommodated in common housing with sealed rim and replaceable cartridge

摘要

The housing (1) for both the standard and ancillary filters has a circular opening in one wall, with reinforced turned-over edges (18) fitted with an elastic sealing gasket (19). The circular rim clips into a matching groove on the outside of the casing (3) of the standard filter. At the same time time standard filter retained in position by pins (15) fitted in the wall opposite to the circular opening. The casing (1) is extended so that a second space (2a) is created to accommodate the ancillary filter (8). The air passes from the outside through perforations (11), through the ancillary filter and then through holes (17) into the space (16) surrounding the standard filter (3). The casing containing the ancillary filter has a window for examining the condition of the ancillary filter cartridge.