wires-going-through-duct-joist-bad Published February 21, 2015 at 1000 × 750 in World Pangolin Day Holes drilled through the floor joists to run the wires, turn into holes that air can escape through once that channel is turned into an air duct. Share this:PinterestTwitterFacebookPrintEmailMorePocketRedditTumblrLinkedInLike Loading...