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Can 2 pvc flues be tied together?

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I will be installing 2 Trane high efficiency furnaces in an attic and would like to pipe each to the roof penetration then together for the actual penetration. I'm not talking about the 2 from one furnace, the intakes will be a seperate deal. The house has a new ceramic tile roof  so adding a second penetration would be very difficult.
asked in Heating System by joshm (120 points)
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1 Answer

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Hi Joshm,

Unfortunately each one of the high efficiency furnaces requires its own PVC vent pipe which starts at the appliance and terminates on its own above the roof surface. You cannot join two condensing, category 4, positive pressure appliances exhaust pipes together at any point, or have it connected to any vent serving another appliance

You could call Trane technicians and ask them about it but I doubt you’ll get a different answer. 

answered by darekrudy (21,730 points)