I conducted a detailed inspection of the ductwork located under the slab floor using a specialized duct camera. The ducts were identified as galvanized corrugated metal, which is prone to degradation over time. Given the concerns about Radon gas infiltration, I provided a proposal to the homeowner for spray lining the ducts with a high-grade sealant. This process involves applying a durable, airtight coating internally across all duct surfaces to encapsulate them, effectively blocking the entry of Radon gases and improving air quality. The proposal includes all material and labor costs for a comprehensive and preventive solution.