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make sure the filter(s) are securely attached

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Q: What is the first thing you should do when performing a negative pressure check on you protective mask?
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When performing a negative pressure check on your protective mask what should you do if the lens does not remain deflected?

readjust the mask


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What is the first thing you should do when performing a negative pressure check on your protective mask?

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make sure the filter(s) are securely attached


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