You can block it. The unit won't heat or cool that room anymore though. The return air does effect supply air temp. And heat pump efficiency. With a 60 degree return air temp, the heat pump is more efficient then with a 70 degree return air temp.
We are simply getting contaminated causing otherwise healthy folks to lose the function of their kidneys and for a senior citizen who is already suffering sarcopenia this can be a death sentence because of the complexities associated with Renal Failure.
Q: What was the Black Death? A: In the Middle Ages the Black Death, or âpestilenciaâ, as contemporaries called various epidemic diseases, was the worst catastrophe in recorded history. Some dubbed it âmagna mortalitasâ (great mortality), emphasising the death rate.