Here is a video of a furnace plenum that is full of sewer and has a badly leaking sewer line under the house.
Update on sick ducting. A company came out and this is one of the problems they found.
Fecal bacteria in H.V.A.C. Ducting. Now I gutted out and re plumbed the sister home next door. built around 1936-38, S.F. The old C.I. was in tough condition. I wonder if there is a crack on a piece of C.I. and it has rusted through ,and enters the H.V.A.C.? This could be in a wall or ceiling. I need a plumber that can do a smoke test. Any ideas on how to best find one? I guess a smoke test on H.V.A.C. also. Thanks this family needs to get this fixed so their Son can come home. Thanks Tool
Check the condensate drain. Make sure it's not plumbed into the vent.
Great idea Gear. I'm thinking of drilling a 1" hole in the plenum for My Sea snake. The sewerage in the Plenem video is scary ! I can repair the 1" hole with a 1" Elec. knock out
snap in seal.
Don't do that. Just take off the access panel. the condensate drain should terminate outside. Just look and see where it goes. A 5/16 nutdriver and flashlight is all you need.