Gas Filter for your e3000x PAPR (Powered Air Purifying Respirator). The a1b1e1 gas filter removes harmful organic and inorganic acid gases and vapors associated with potentially toxic and/or highly polluted welding environments. It also removes ozone and odors that may also be present. The acid gas filter cartridge snaps directly into your e3000x blower motor and is used IN ADDITION to the standard PAPR HEPA filter. NOTE: NOT suitable for use in all toxic welding environments. Consult industrial hygienist for OSHA Personal Exposure Limits (PEL) for your specific application. *not NIOSH approved