A low-flow bubble humidifier is running at 4 L/min and is not whistling. Which action should be taken at this time?
a. No action should be taken because this is normal.
b. Increase the flow to make it whistle.
c. Replace the spring-loaded valve.
d. Change the unit because there is a leak.
ANS: A
The humidifier is functioning normally. The pressure-relief valve releases high pressure (>2 psi) to prevent bursting of the humidifier bottle when there is an obstruction creating a whistling sound. Leaks are not detected by the pressure-relief valve.
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