Use the following formulas.
Moving return air duct.
The air that it s conditioning though isn t just whatever it can get.
Return air ducts usually use ceiling joist spaces as the actual duct which then runs back toward the furnace.
Air handler platforms used as return air plenums can draw air from vented attics and crawlspaces through other connected framing cavities.
A mismatch in return air inlet grille or duct size will reduce the system s effectiveness.
Sketch out the current duct layout and note the location of each joint.
Need to move return air vent.
Visual inspection for prior attempts to improve return air such as holes cut into an existing return air duct or worse openings cut to admit more makeup air into the air handler from an un conditioned space such as an attic or crawl area.
Forced air heating and cooling systems use ducts to move conditioned air from the furnace heat pump or air conditioner back into the living space inside the house.
If the supply ducts are in the floor then the return air should be located up high.
Measure the existing ducts that are too low.
While none of these spaces makes an acceptable air pathway on its own some building cavities such as floor joists can make acceptable duct chases to contain an insulated air sealed metal or flex supply or return duct.
You can reroute it or split it into more but smaller ducts.
But the least disruptive and easiest way is to replace the low ducts with new ducts that are flatter but wider.
This pulls the air across your body.
I am going to be installing a 5 patio door where my dining room window currently is.
Calculate the return duct size based on the air conditioner s size and the type of duct you are using.
Without a return air duct the air would not properly circulate and your energy costs would rise.
The problem is that there is a return air vent in the wall directly under the window that needs to be moved before i can install the door.
To do this cut away any duct tape with a utility knife then loosen and remove the duct screws.
Detach the connection where the flexible duct meets the circular end of the rigid duct.
The return air vent openings need to be on the opposite side of the room so the conditioned air is pulled across the room.
If the supply ducts are high or in the ceiling then the return air ducts or grills should be low on a wall.
Size of air conditioner example.
4 tons x 144 square inches return air duct in square inches.
