Does a half mask with particulate filters give a higher APF than a similar specification disposable respirator?
A. Purely based on the protection factor, and not taking into account other factors such as user acceptability and cost effectiveness, there is no difference in APF between disposable particulate respirators and a half mask fitted with the same specification filters. There is a difference between the APF associated with using the same filter on a half mask and a full face mask. e.g. P3 filters on a half mask give an APF of 20 but when the same filters are fitted to a full face mask the APF is 40.
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