These 3M 15-0299-99X06 Adflo High-Efficiency HEPA Replacement Filter Cartridges are for the 3M Adflo Powered Air Purifying Respirator (PAPR) (P/N: 16-1101-40) or the 3M Adflo Powered Air Purifying Respirator (PAPR) Speedglas 9002X FlexView HWR Helmet (P/N: 16-1101-21SW). Sold in packages of 6 filter cartridges.
See TnA Safety, Webster, NY on MacRae's Blue Book