Quote:
Originally Posted by Ducay
You nailed it on the head. It is used to limit airflow to certain vents if it is on the "output" side of the furnace. I've got one to adjust heat that goes to a crawl space, sounds like yours is similar. With the dampers, arrow pointing along the pipe will allow airflow, arrow perpendicular to pipe will shut it off (mostly, they only close ~80-90% at max anyways.
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That's crazy...I've lived in this place since 1999 and it never dawned on me that it could be connected to a flap of sorts. I didn't even notice that the main trunk split like that as it's the exact same size after the flap, just saw the seam now.
Man...you think you know your place
