The therapist is setting up a noninvasive positive-pressure ventilator and wants to minimize the degree of rebreathing that tends to occur because the ventilator incorporates a single tube breathing circuit. How can the therapist accomplish this goal?

A. by using an EPAP of less than 4 cm H2O
B. by employing a breathing circuit that has an in-circuit valve
C. by selecting a ventilator that has a preset leak specific to the ventilator
D. by incorporating a mask that houses an in-mask exhalation port

ANS: D