NIOSH approved when used with gas proof goggles or the Moldex 9000 full face when used against ammonia. For use against particulates when no oil is present use with 8910 N95 Pre-Filter and 7020 retainer. For use against particulates when oil is present use with 8970 N95 Pre-Filter and 7020 retainer. For contaminants that fall under an OSHA substance specific standard requiring a high efficiency particulate air (HEPA) filter use with 7940 P100 filter disk and 7920 Piggyback adapter.