MAINTENANCE-FREE ANTI-FOG RESPIRATOR

摘要

A respirator (10) that includes a harness (14) and a mask body (12) that is air permeable. The mask body (12) has a sinus region (40) and a primary filtering region (44) and comprises at least one nonwoven fibrous webs, which web includes a layer of filter media. The sinus region (40) of the mask body (12) exhibits a resistance to airflow that is greater than the primary filtering region (44). This resistance to airflow is achieved through an alteration of the intrinsic structure of the plurality of nonwoven fibrous layers in the sinus region (40) without adding additional material to the mask body. The alteration of the intrinsic structure assists in preventing eyewear fogging.