I live in York Region (Vaughan Ontario). The gas company came by and performed a visual inspection. They identified my furnace exhaust pipe (black APS 2") is starting to crack at the coupling (its about 2 feet above the actual furnace) and said I should replace the pipe with the white PVC (Ipex or Royal).
I did some research and based on the recommendation, I should prime, then glue the new pipe.
I'm assuming I can cut the black pipe with enough room to add a coupling just above where the pipe comes out of the furnace and then continue with the new white pipe.
Can I also add a coupling at the other end near the exterior wall of the house? Do I have to replace the full length to the white pipe to make it go outdoors? Obviously its easier to just add a coupling near the wall since the exterior is all caulked and already sealed. In essence I would have about 2 inches of black pipe coming out of the furnace, then about 8 feet of white pipe, another coupling joined to about 1 foot of black pipe which is already going out doors.
Thanks.
Best Answer
You need to look at the markings on the white pipe. Standard DWV PVC should not be used for flue gases, but unfortunately it is used all the time. If the entire run is not rated for flue gases, then you should replace it.