Another one of the many condos we have televised in this subdivision and found the underground duct work was heavily rusted out. First we cleaned all the ducts of dirt, dust, and debris, then we applied our spin cast mortar to restructure the weak rusted metal. Finally we were able to coat and seal the underground ducts with our duct armor product leaving a clean air flow for the customer. Now the customer can take a break from having to dust and clean daily due to old ducts allowing dirt in!