Loose and disconnected ductwork found in a crawl space

One supply duct had pulled loose from its boot and another had come apart at the collar, so the blower was pulling crawl-space air, dust and moisture into the house instead of conditioned air through it. Neither problem was visible from inside the home.

Both runs were reconnected, mechanically fastened and sealed, and the rest of the ductwork was checked while we were down there.