Televised underground duct work found the metal was heavily rusted and weak, the ducts have had ground water enter the system many times in the past, since then the customer has had drainage work done to divert water around the house instead of entering the duct work. With the water issue resolved we were able to trenchless cast the system giving the weak metal good structure again! Now with good structure we applied our duct armor product to completely seal the system leaving a clean air flow.