Conducted duct inspection using RIDGID SeeSnake microReel camera system. Identified severe rust and deterioration in galvanized under-slab ducts. Recommended two-step restoration process: 1) Spin-cast mortaring using Quikrete Commercial Grade FastSet Repair Mortar to rebuild structural integrity. 2) Application of Duct Armor elastomeric duct lining material using Graco Ultra Max II 595 PC Pro sprayer. This comprehensive approach will restore duct function, prevent air leakage, and significantly extend system lifespan without costly slab demolition.