[team bradfield]

I checked the furnace exhaust and a critter had built a nest, some leaves and something, looks like a steel scouring material, it was jet black and wife confirmed, that was the smell when i took it to her. I fired up the furnace and now its sounds like its sputtering flame and it is smoking, white smoke coming out, shut it all down, i guess its time to clean it out, do you think this damaged anything?