Cleaned all underground ductwork. Applied first application of duct armor to all underground ductwork. 10-20-25 Broke up concrete floor to expose the 10” metal elbow with gaps in it. Applied hydraulic cement to seal around the holes. Backfilled hole with 3/4” stone and recemented floor. Applied second application of duct armor to all underground duct work.
Televised ducts under slab floor. Ducts are concrete possibly transite ducts with metal fittings. Metal fitting look good for most part but elbow in lower family room is bent and there is a hole in the pipe that should be patched before lining. After patching elbow suggest spray lining system with Duct Armor duct lining material.