![]() ![]() This recommendation is easier to accomplish when the supply and exhaust points are included as part of a “drop ceiling.” Generate clean-to-less-clean air movement by evaluating and repositioning as necessary, the supply louvers, exhaust air grilles, and/or damper settings.** See FAQ #4 below on Directional Airflow.If an infectious source was present, see FAQ #2. In non-residential settings where an infectious source was not known to have been present, run the HVAC system at maximum outside airflow for 2 hours, or until the building has achieved at least 3 air changes, after the building is no longer occupied.Operating them even when the specific space is not occupied will increase overall ventilation within the occupied building. Operate these systems any time these spaces are occupied. Inspect and maintain exhaust ventilation systems in areas such as kitchens, cooking areas, etc.Ensure restroom exhaust fans are functional and operating at full capacity when the building is occupied. ![]() In homes and buildings where the HVAC fan operation can be controlled at the thermostat, set the fan to the “on” position instead of “auto,” which will operate the fan continuously, even when heating or air conditioning is not required. ![]()
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