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UPDATED GUIDANCE NOTE ON IMPROVING VENTILATION …

systems with outdoor air intake for two hours before and after each occupancy. 2.4. Minimise indoor air recirculation; use high-efficiency filters in AHUs to treat recirculated air: a. Set recirculation air dampers to a minimum. b. Use high-efficiency filters (at least MERV14 or F8 is recommended) in AHUs to treat recirculated air.

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