In California, I'm installing a 3x14 rectangular supply duct from my attic to my first floor. It goes vertically through the second floor wall, through the floor, and ends in the first floor ceiling.
How should I support the duct run in the wall cavity?
I usually shoot a couple of screws through the sheet metal into the studs, if you have AC I like a layer of insulation to prevent sweating and dry rot potential, but have not really seen any problems when directly attached with no insulation verticly in a wall.
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