thank you for sharing your knowledge. i understand what your saying now. then i have no choice but to either pull the air handler out and coil, to be able to redo the plenum shorter so i can raise the frame of the air handler up. i can also just leave it alone as is and deal with the noisy return for a while. i would rather redo the plenum,and raise the air handlers base. thanks beenthere .
tinmarine thank you i understand now.
dash this is the best i could do right now to kind of give a view of what im talking about.
the x is the closet unit with returns at bottom of air handler. the number 2 is system A's second return in question.