Home Videos Repairing HVAC Ductwork In A NASTY Crawlspace!! Repairing HVAC Ductwork In A NASTY Crawlspace!! Sep 30, 2021 comments off Tweet on Twitter Share on Facebook Pinterest ac service tech airflow issues duct repair ductwork cleaning ductwork fabrication ductwork in crawlspace ductwork installation ductwork insulation ductwork sweating ductwork tricks flexible duct installation flexible duct sizing flexible duct vs metal duct how to repair ductwork hvac hvac ductwork repair hvac school hvac training videos hvacr hvacr videos residential hvac repair sealing flexible ducts