[johnsjmc]

My take on sealing or venting a crawlspace depends on if you want max efficiency during a heating season (sealed) or a cooling season (vented or wide open) Home Depot and Lowes sell all the stuff needed to seal up ,replace or repair and rehang
My Tampa house had a distribution box made from ductboard which was all split open. The individual runs were then 6" flex wjth lots of droopy spots. half my air was heating and cooling the outdoors. . I first considered doing it myself but got a really good deal from a contractor
I found the best deal from a guy on craigslist . I insisted they take out a permit. No problem except a little slow to come back for something small they missed.