For those who wear respirators in atmospheres with exposure levels greater than 10 times the permissible exposure limit (including full face mask or higher) you are required to utilize a quantitative fit test procedure. Safety Links uses a state of the art PORTACOUNT® respirator fit tester which can compute a respirator fit factor in to the hundreds of thousands. This procedure does not relay on the users perception or honesty to ensure an adequate fit.
http://www.safetylinks.net/respiratortraining.htm
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