Cleaned all underground duct work in preparation for spin cast mortar. 5/8/25 Applied trenchless spincast mortar to all cardboard underground ductwork. Repaired furnace box and all register vents with hydraulic cement. 5/13/25 applied first application of duct armor material to all underground ductwork 5/20/25 Applied second application of duct armor to all underground ductwork and furnace box.