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ASHRAE EPIDEMIC TASK FORCE
www.ashrae.orgOct 21, 2021 · b. In-room air cleaners i. When HVAC air cleaning is not sufficient, consider using in-room air cleaners. Only use air cleaners for which evidence of effectiveness and safety is clear. ii.Consider using in-room units in conjunction with HVAC filters to meet a clean air exchange level or a specific number of air changes per hour (ACH).