The most effective methods to reduce transmission of SARS-CoV-2 (and far more important than anything related to an HVAC system) continues to be:
1. Social distancing of 6 feet or more;
2. High touch surface cleaning and disinfection;
3. Hand washing and other strategies for good hand hygiene;
4. Source control (e.g. wearing of masks in public)
Generally, the disabling of heating, ventilating, and air-conditioning systems is not a recommended measure to reduce the transmission of the virus. Air flow management appears to play a greater role than air conditioning in exposure risk reduction of public spaces. The recommendations in this document should not be viewed as requirements for reopening, but rather recommendations to support infection prevention accompanying social distancing and source control.

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