This 2-pk. of 3M replacement cartridges is for use with professional multipurpose respirators, Item#s 547560 & 547561. For acid gas/organic vapor (for disinfecting livestock buildings); chlorine, hydrogen chloride, sulphur dioxide; particulates. U.S.A. Filter Included: Yes, 2, Filter Rating: N95, NIOSH Approved: Yes, Respirator Type: Replacement cartridges for item# 547560, 547561