Time-Weighted Average (TWA) 7
Time-Weighted Average (TWA) 7 : The average of the exposure concentration variations or excursions usually calculated over an 8-hour workday. Type C respirator An airline respirator, for entry into and escape from atmospheres not immediately dangerous to life or health, which consists of a source of respirable breathing air, a hose, a detachable coupling, a control valve, orifice, a demand valve or pressure demand valve, and arrangement for attaching the hose to the wearer and a facepiece, hood, or helmet
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