Question

the high efficiency filter must be changed when (select all that apply): the low air flow alarm is activated the filter has been physically damaged or is visibly soiled or contaminated the unit does not pass the air flow test with a properly charged battery at every holiday annually, or at the frequency recommended by site infection prevention

Explanation:

• "The low air flow alarm is activated" implies airflow issues, likely due to a clogged/damaged filter, so filter change is needed.
• "The filter has been physically damaged or is visibly soiled or contaminated" directly requires filter replacement.
• "The unit does not pass the air flow test with a properly charged battery" suggests filter - related airflow problems, so filter change is necessary.
• "At every holiday" is not a valid reason for filter change as it's not related to filter performance/condition.
• "Annually, or at the frequency recommended by site Infection Prevention" is a standard maintenance schedule for filter change.

Answer:

A. The low air flow alarm is activated
B. The filter has been physically damaged or is visibly soiled or contaminated
C. The unit does not pass the air flow test with a properly charged battery
E. Annually, or at the frequency recommended by site Infection Prevention