I was tearing out this 3.5 ton system and thought I would snap a few pics.
Just an average crappy custom home install in the DFW area of Texas.
Single 18" return duct connected directly to the bottom of the furnace.
I wonder what size the duct effectively was with the blower assembly basically sitting in the end of the duct?
Hmm, sooted up vent pipe on a 80% natural gas furnace, wonder what caused that?
I guess that explains the soot...
There were 5 of them popped all the way off, at least 2 more were popped, but still hanging on like Florida ballot chads.
Looks like their regular service outfit "fixed" the tripping rollout switch problem in the past.
They applied the same "fix" to the other furnace in the house too!
We were only there to replace the upstairs system, but I think we will be badk for the downstairs system real soon.
We put in a 4 ton Trane XL16i with a 80k XV80 furnace, Aprilaire2200 air cleaner, slab coil, plenums and some additional supply and return. I had to pull off to run a couple of service calls, so didn't get any pics of the finished install.