Is it okay to use 8 inch flex duct for a cold air return line?

go2guy Posts: 3, Reputation: 1

New Member

Jun 19, 2012, 12:16 AM

Is it okay to use 8 inch flex duct for a cold air return line?

I am running heat and air to an existing room that was once an attached garage so it will have to run through the attic. I want to eliminate the wall heater and window air unit from the room.

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