Social distancing indoors is of little value unless you improve ventilation. Dr Amar-Singh HSS shares how Malaysians can reduce airborne transmission indoors with 3 main mechanisms.
Keep windows and doors open to optimise natural ventilation. The flow of air in and out may vary with a breeze and time of day.
Use mechanical ventilation to improve air exchange: Have a stand fan at the window to suck air out of or into the room or use window-mounted exhaust fans. Window-mounted exhaust fans can have MERV 13+ or HEPA filters to bring in clean air; useful for ground level rooms.Use reliable Carbon dioxide monitors as a proxy indicator of airborne particles – there are fake products on the market and the reference offers a detailed review.
The University of Melbourne has done a review of which air cleaners work best in relation to their cost .The capacity of the devices must match the room volume/size. Check their CADR .You may need more than one device per room if speed is important – see: “With 2 small domestic air cleaners in a single patient room of a hospital ward, 99% of aerosols could be cleared within 5.5 minutes”.
The filters will need to be changed periodically and it is important to factor in the cost of filter replacements.
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