抄録
For COVID-19 and for many other respiratory viruses three transmission routes are dominant; （1）combined droplet and airborne transmission in 1-2 m close contact region;（2） long-range airborne（ aerosol-based） transmission; and（3） surface （fomite） contact through hand-hand, hand-surface, etc. contacts. The risk of an airborne transmission and cross-infection over distances more than 1.5 m from an infected person of this（2） can be reduced with adequate ventilation and effective air distribution solutions. It is at this distance that ventilation may be able to control the infection. This report explains the operation method of the mechanical ventilation system and the points of ventilation design. The scope is limited to commercial and public buildings. Residential buildings are out of the scope of this report. The most effective operation method that can be dealt with is the improvement of the performance of the air filter. On the other hand, in the design of building services, high-efficiency ventilation systems and heat recovery equipment can be considered other than the increase in outdoor air volume. Also, this is a basic thing, but it is important to design supply air inlets and exhaust air outlets so as not to create a staying of an air.
