We are cleaning all of the heavily rusted underground air ducts in preparation for our Trenchless cast mortar. We are going to apply our Trenchless cast mortar to all of the underground air ducts to give them a strong concrete structure. This will keep dirt and debris from flowing out of the air vents and throughout the home. We are then going to apply two applications of our rubberized duct lining material to completely seal the air ducts.