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Why do I need double wall vent pipe for furnace?

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Asked by Jovi: 
 I’m remodeling some areas in my home which call for changing some exhaust pipes on my 1984 Heil furnace. I came across one large rounded shape pipe that is doubled inside. What is the reason for doubling the pipe. I need to change the shape (from circular to rectangular due to room contraints) should I double the new exhaust pipe as well?
asked in Heating System by darekrudy (21,730 points)
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1 Answer

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Hi Jovi,
 Double wall vent pipes are required for safety reasons and you’d have replace the existing round pipe with the same double wall rectangular (or rather oval) pipe. It’s not permitted to use single wall vent pipe in any concealed (walls, ceilings, etc.) and unconditioned areas (attic, crawlspace, garage, etc).
You can find more information about furnace vent pipes by visiting HVAC category on my website - http://checkthishouse.com/category/hvac/house-chimney-problems/
answered by darekrudy (21,730 points)