In my home I have two air returns for my furnace. One is on a wall near the floor and the other is straight up above it near the ceiling. Upon removing the covers to clean them I see that the air theoretically goes up between a couple of studs up the wall and over to the furnace. However, I am wondering, should this channel within the wall where the air returns to the furnace be lined at all (eg. with metal)? At the moment it isn't. I wondered if it was supposed to have a sealed channel that returns air to the furnace. Evidently, the air just goes into the wall and the furnace picks it up from there?
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Furnace Cold Air Return Question