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JandC,
I think what you are referring to is the heat vent for the garage. On mine it is NOT the cold air return for the furnace. There was heater hose behind the wall that was intended to keep the garage warm and protect the pipes from freezing. The vent allows heat into the garage. I stuffed a sock in mine and pulled the vent off and installed shelves instead. We never are in cold weather that we need to worry about freezing.
The cold air return is under the stairs our rig and I assume on yours as well.
Ken
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