| 摘要 |
<p>A high efficiency rigid or semi-rigid air filter cartridge for use in the helmet of a powered air respirator comprising a lightweight, open-topped, trough-shaped frame having an entrance at one end for attachment to an air discharge port of a fan motor housing assembly, filter media sealed about its periphery to close said frame, said frame and said filter media enclosing a contaminated air plenum bounded by the inside surfaces of the bottom and side walls of said frame and the under surface of said filter media, such that contaminated air from said air discharge port is channeled under pressure through said plenum and distributed under pressure to and through said filter media and provides purified air, is disclosed. The filter media may be a sorbent particle-loaded web, an electrically charged filter, or pleated fiberglass paper. A high efficiency powered air respirator for providing filtered air to a wearer, is also disclosed. The powered air respirator includes the rigid or semi-rigid air filter cartridge of the invention as well as improved sealing means between the respirator parts.</p> |
