Our building is near residential areas, is it safe to exhaust this air outside?

Yes, it is safe to exhaust air that has been purified to >99.99% effectiveness against virus and bacteria with the HEPA Filter and UV-C Light inside the unit. The purified exhaust is safe to send outside at ground level (or any level), safe to send up into the ceiling plenum, and safe to incorporate into HVAC system returns. 

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