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.
Patellofemoral pain syndrome (PFPS), is the medical name for conditions often called chondromalacia, kneecap pain, or more simply, runner's knee.. The exact source of pain in these patients with PFPS is a subject of debate. Traditionally, people have thought that the pain is a result of irritation of the cartilage on the back of the kneecap.