Cleaned all underground duct work in preparation for spin cast mortar. 12/2/24 Applied Trenchless spincast mortar to all underground ductwork and furnace box. Repaired and rebuilt furnace box and all register vents with hydraulic cement. 12/3/24 Applied first application of duct armor to all underground ductwork and furnace box. 12/10/24 Applied second application of duct armor to all underground ductwork and furnace box.