By Ivan from Chicago, Illinois on October 23, 2013
I want to install a wye fitting, to replace an existing 90 degree elbow, and put a cap on one of the three openings of the wye fitting to catch condensation. I will attach a picture of the pipe I am dealing with. Is there a universal fitting that will fit over any type of b-vent pipe? I don't know who the manufacturer is for the existing B-vent set up. (B-vent to single wall pipe on picture).
By Collin C. - NFI Master Hearth Professional on October 24, 2013
Answer:Metal-Fab B-vent fittings will usually work with other brands of B-vent pipe without an issue, as their design is intended to be universal. However, wye fittings are designed with the wye takeoff being either 1 or 2 inches smaller that the through legs of the wye. This is because code does not allow two of the same diameter pipes to be vented into a common vent with the same diameter. It appears that the single wall pipe and the B-vent in the photo have the same diameter. We do carry another line of stainless single wall pipe that has a condensate trap, but it is not compatible with B-vent. You may have to look into a custom wye fitting for your application.