What is the return wall?
"Back wall" is a term used in construction and refers to a wall through which fresh air or indoor air is drawn into the forced air system. It provides oxygen to ensure complete fuel burning and also circulates the air throughout the building. This allows the air to warm up or cooled at each passage. In the forced air heating system that burns oil, natural gas, coal or other carbon fuels, oxygen is required for combustion. In modern building technologies, buildings are often sealed from outer fresh air. If the fuel is completely burned as soon as it occurs, if an oxygen is excess, it is a by -product of carbon dioxide. In incomplete combustion, carbon monoxide is produced and is deadly for humans and pets, so it is important that fresh air is supplied to the furnace whenever it is used.
In residents, a passive system for Fresh air is used to the furnace. There are no fans that push fresh air into the system. InsteadThe fresh air is drawn into the furnace through the inner spaces between the pins of short lengths of the specific walls. These are the return walls.
The back wall differs from the neighboring wall in that it is open at the top or below, where there is framing, not on the outer part where you can see in the room. There it connects with a distribution system, such as pipes from the floors above it or below it or both. Some pipes are connected to the ventilation openings in the attic or in the basement to bring outer air and oxygen. Another pipe connects to bars in the back walls to circulate the air air. Circulation is essential to prevent the feeling of "constant" and allow the air to be exposed to heating or cooling elements in the system, thus raising or reducing the room temperature.
From the point of view of the owner of the house, it is important to know where the return walls are. They can be found if someone is looking for grids on the top or bottom of the walls of the room.The back wall should be left intact. Small holes, such as holes caused by suspended images on the outer surface of the wall, are not harmful. However, the inviting wall is not a place for one that builds nooks or hangs an international structure such as a bathroom cabinet.
It is important that the channels of the return walls are maintained so that the system has a mechanical ability to suck air. It is possible to imagine suction needed to draw fluid through a small diameter straw compared to a large diameter straw. If the straw is divided down, it cannot be used at all. If the back wall is removed, an alternative air path should be found for air circulating.