... can protect the personal respiratory organs. Its filter element is the dust filter box (double), and it is according to ... The product’s components are face blank, the dust filter box (double), exhale valve, harness. The harness ... 3.4 During the working, when the smoke filter loses efficacy, the user should leave the work ... freely.4.3 The dust respirator is the filter element can change, so it can’t use in ...