[sberder]

I haven't seen one of the main arguments against UV efficiency in the context of an HVAC system.

Most common UV solutions simply cannot clean at the speed the air goes through the systems in most buildings. When you have to maintain 6 air changes per hour, the UV solutions are simply not manageable.

There are other limitations but that's the main issue as far as I can tell talking to facility managers.

[dtgriscom]

A room, its occupants and its HVAC is a steady state system, with people emitting virus particles and the HVAC system removing it. The goal is to have the HVAC system remove virus particles quickly enough so that the average particle density is low. You don't need the air coming out of the vent to be completely aseptic; you just need to remove a significant amount of the virus on each pass.

[vigeek]

This is what I have installed at my house, it works well.