I work in Heating, Ventilation & A/C repair & this pandemic has been pretty good for business. I mean I understand the desire for a whole-home filtration system. Those systems kill & trap any virus or bacterial germs that are trying to circulate through the Heating, Ventilation & A/C system. I also understand the whole-home humidifiers. There is evidence that virus germs dye swiftly in high humidity. Then there are the people who just want HEPA filters or stronger filters installed in their central heating & air, however what I don’t understand is the restaurants who want air duct rerouted to the outside, however yes, I do understand the struggle to stay afloat when the government is putting restrictions on everything, but my neighborhood has laws right now that restaurants are only allowed to serve outdoor restaurants. This is because UV light & fresh air lower your risk of virus exposure. In fact, most whole-home whole-house air purifiers use little UV lights to kill the viruses that pass under it. So do the HEPA filters, for that matter; However, several restaurants are closing in their outdoor dining areas with plywood, plastic sheeting, & other things. Then they are hiring Heating, Ventilation & A/C workers like me to come & reroute Heating, Ventilation & A/C air duct so that it cools or heats these “outdoor” areas. So this, essentially, blocks off all fresh air & UV lighting. No, these outdoor areas are not completely sealed up. That can’t entirely be achieved with those kinds of materials. However, I don’t see how that is any safer than just eating inside of the restaurant. At least a few restaurants are getting the whole-home purification systems installed at the same time. But not several of them do.