What does ASHRAE 170 require regarding the recirculation of exhaust air from soiled utility rooms in healthcare facilities?
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A
Exhaust air may be recirculated after HEPA filtration
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B
Exhaust air may be recirculated if UV-C treatment is applied
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C
Exhaust air must be 100% exhausted to the outdoors with no recirculation
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D
Exhaust air may be recirculated within the same department only