COMBINED VAPOUR AND PARTICULATE FILTER

摘要

With reference to figures (1 and 2), a personal respirator (1) has a face ma sk (2) and is provided with a filter unit (3) comprising a canister (4) housing contiguous layers (5) of novel filter material (6). The filter material (6) is suitable for both particulate and vapour filtration, and comprises a composi te of first and second groups (10, 11) of chopped fibres, the fibres of the fir st group (10) having a relatively large diameter (about 7 x 10-6m) and the seco nd group (11) having a relatively small diameter (about 0.5 x 10-6m).