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.
But prosecutors believe Prieto is a serial killer responsible for as many as nine murders. He is scheduled to die Thursday night. Unless the Supreme Court steps in, Prieto will be put to death inside the Greensville Correctional Center in Jarratt, Virginia.