Can you recommend a powered respirator that is both comfortable and effective for extended periods of shop use?— Caleb Dietrich

George Saridakis replies: I have used a 3M HEPA Airmate Systems for the last 15 years and swear by it. The complete Airmate system would consist of one Air Filter unit, one smart charger and one of the headpiece packs—www.airwareamerica.com.

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