N95 filter certification test

NIOSH required test for N95 respirators that measures filter efficiency and penetration of a 0.3 um sodium chloride particle aerosolized at a flow rate of 85 liters per minute, requiring a 95% filtration efficiency. OSHA requires that all respirators be properly fit tested using a quantitative or qualitative fit test when initially assigned to a user, and periodically thereafter. A user seal check should be performed each time a respirator is put on.