Can someone tell me how much return air is needed for a 5 ton Air conditioner sytem? I currently have a 20 x 30 filter grill. The chase that runs up into the attic is 27.5 x 19.5.. The blower is set on 2000 cfm.
Can I add another return filter grill on the other side of the wall next to the current return air grill, or should I see about adding another 20 x 30 filter grill in another part of the house? If so any tips on mounting a return box in the ceiling?