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.
In this article, we will review the nature of sarcopenia, its causes, and ways to both prevent and manage this condition. Since sarcopenia has no single cause, its prevention and treatment require an integrated approach that incorporates dietary strategies, hormone replacement, nutritional supplementation, and exercise.