Televised ducts under slab floor. Ducts are plastic coated spiral wound metal ducts. There was no standing water in the ducts at the time of the inspection but there were water marks and rust indicating possible water in the system at times. All the downspouts around the house need to be extended and some areas need to be regraded next to the house to allow better water flow away from the house. It is recommended that the ducts be spin cast mortared then spray lined with Duct Armor duct lining material.