Originally Posted By: sramos
This post was automatically imported from our archived forum.
I inspected this house today and this is what I found when I looked at the natural gas furnace chimney. As I was inspecting the furnace I noticed a ticking noise which sounded like water pinging the metal. Of course their was plenty of rust in the draft hood and on the burners.
My assessment was that the byproducts were condensing sooner than they should and dripping back down the flue. Just so happens at the end of my inspection an HVAC guys shows up to do a bid for adding AC to the unit. He says the furnace is just fine but very old.
My concern, I didn't question him in front of the Realtor, was that the condensation will rust the heat exchanger from the top. This is an upflow furnace.
EnviroVue Home Inspection