The then Secretary for Food and Health has earlier stipulated a requirement on air change or air purifiers to be complied with in dine-in restaurants in the directions in relation to catering business under the Prevention and Control of Disease (Requirements and Directions) (Business and Premises) Regulation (Cap. 599F). The Working Group, established for the smooth implementation of the requirement has promulgated “A Guide on Compliance with the Requirement on Air Change / Air Purifiers in Seating Areas of Dine-in Catering Premises” for reference by catering premises operators and ventilation works contractors.  The guidelines can be downloaded vide the FEHD's webpage links as follows.

The Working Group recommends practical measures to increase the air change per hour of fresh air in restaurants for reference:

Reference Video for ACH-Air purifier (This Reference Video has been removed to Video Corner.)