Our respiratory program is designed to filter out contaminants and to fit snugly yet comfortably to avoid leaks. Our product line consists of disposable respirators, fully assembled respirators, replacement cartridges and filters and welding respirators. NIOSH’s 42CFR84 standard for particulate respirators provides for filter efficiency and filter degradation. The efficiency levels are 95%, 99% and 99.97%, which correspond to the numerical designation 95, 99 and 100. Selection of filter efficiency depends on how much filter leakage can be accepted.