A worker selected a half facepiece (half mask) powered air purifying respirator

Question

A worker selected a half facepiece (half mask) powered air purifying respirator that provided the most comfortable fit. The worker was then given a quantitative fit test using the sodium chloride protocol with a special respirator of the same size as the one the worker selected. A TSI Portacount instrument was used to measure the concentration of sodium chloride inside the respirator (0.12 mg/M*3) and outside the respirator 3.5 mgM-3). What is the protection factor for the respirator worn by this worker? a. 29 b. 50 O c. 305 O d. 14.3 e. 35

Explanation / Answer

Option a is correct. The protection factor PF is calculated by using the formula PF = Cout/ Cin where Cout = outside concentration and Cin = inside concentration.

Thus, here PF = 3.5/ 0.12 (here unit is same).

= 29.16

This value (29.16) is corrected by the ratio varied from 0.97 to 1.04 because of difference in the penetration efficiencies of particles between the two sampling lines due to slightly different configurations. Therefore correct answer is 29.

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