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I was out testing new houses for Energy Star compliance and snapped this image of this mechanical chase.
What does a house look like before the walls go on? Like this. In this development, this mechanical chase was a serious point of air leakage. The war air from the house could easily enter the attic, taking with it the heat and moisture that you want in the house. In this chase is the dryer vent (metal pipe) and the radon pipe (plastic). The view is looking straight up the chase and into the attic.