title: Respirator protection factors: Part II-protection factors of supplied-air respirators.
abstract: Protection Factors provided by 25 NIOSH approved supplied-air respirators were determined while the devices were worn by a panel of test subjects anthropometrically selected to represent adult facial sizes. Polydispersed DOP aerosol was used for respirator fit tests on continuous flow, demand, and pressure-demand respirators. Based on facepiece leakage measurements it appears that demand-type respirators should neither be used nor approved. The highest level of protection was provided by pressure-demand devices.
mesh_terms: D005069:Evaluation Studies as Topic; D005260:Female; D006801:Humans; D008297:Male; D009787:Occupational Medicine; D011482:Protective Devices / Q000592:standards*; D012134:Respiratory Protective Devices / Q000592:standards*