Customer was getting water in the underground air ducts so we installed a sump pit and pump with a section of drain tile deeper than the duct work to eliminate water from getting into the system, after the water issues was resolved we applied spin cast mortar to all the underground duct work to give the weak rusted metal fittings some structure, after the spin cast mortar we applied two applications of duct armor to seal all the duct work leaving a clean hvac system for the air to flow through.
