Rather than focusing on ventilation, I suggest thinking about recommending the voluntary use of respirators (preferably the elastomeric kind) instead. The problem with ventilation (even if it was theoretically 100% effective) is that it’s only as good as how it was setup and maintained, and during a dangerous pandemic, I wouldn’t trust any of these external systems to function properly.
Rather than focusing on ventilation, I suggest thinking about recommending the voluntary use of respirators (preferably the elastomeric kind) instead. The problem with ventilation (even if it was theoretically 100% effective) is that it’s only as good as how it was setup and maintained, and during a dangerous pandemic, I wouldn’t trust any of these external systems to function properly.