A qualitative fit test (QLFT) is a pass/fail test for a respirator. It is fitted to a person to assess the adequacy of respirator fit. It relies entirely on the individual’s sensory detection of the test agent.
Advantages of a QLFT are that it is an inexpensive and simple procedure, it determines the brand and respirator size of the user. However, a QLFT cannot determine the limit of protection-factor or numerical results and there are chances of user deception.