Actually, I think I need to replace the combustion fan. It is the one getting pretty loud. Or, at least buy one to have on hand when the one in the unit Sh#is the Bed.
Ah, that's what I replaced, I had a guy do it and bird dogged him for the next time, let him borrow my wing nut ratchet attachment to loosen some nuts. The circulation fan on mine went in the first year under warranty, that is still going. I found a company near Cairo NY that delivers, they have a pretty cool remote tracked vehicle that carries the pallets down my long steep driveway, amazing the lifting capacity seeing my BX only lifts 600 pounds.