Performed the level 1 furnace safety check. Inducer motor is starting to wear. Heat exchanger has rust and metal chipping. There was also a lot of backdraft from the heat exchanger with the smoke test. Combustion readings were also a little higher than they should be. No CO detected in the air at this time. Average life of system is 12-15 years. Furnace is currently 20+ years old. Due to age, condition, cost to repair, and for safety measures, a second opinion is recommended with Dan Fox to consider options.