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Patient circuit (left) and patient connection to test lung (right): (A) patient air supply hose and reservoir bag; (B) self-inflating bag; (C) peak inspiration pressure valve; (D) HEPA (high-efficiency particulate absorbing) filter and positive end-expiratory pressure valve; (E) active patient valve; (F) spirometer; (G) heat and moisture exchanger and filter; and (H) simple test lung.
