Unlike supply vents return vents do not need to be cased in metal.
How to install a cold air return floor grill.
First building codes in many areas require that the cold air return line gets external insulation and therefore you will need to leave a gap for the insulation around the duct return line.
The return vent pulls cold air from the bottom of the room and returns it to the furnace to be reheated and returned as warm air.
Pham from hamilton asked why he sees air returns on the ceiling sometimes and on the floor in other houses and what effect this placement has on air quality in the house if you are in the far north or in the southern us the answer is simple.
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In a heating climate the return duct.
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That would then reduce the flow of conditioned air to that space.
That is why you need a cold air return image 1.
Running a metal cold air return duct between studs requires knowledge of both hvac systems and the components involved in framing.
In an air conditioning climate the return duct goes near the ceiling to draw off the hot air and cool it down.
They can be placed into staircase cavities stacked closets that run one on top of the other or in stud cavities in the wall.
For the system to work you have to re circulate the air back to the furnace.
Warm air rises and the return will direct that air to the cooler.