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Terry O'Brien
Furnace Venting
Terry O'Brien

I am getting estimates on a high-efficiency furnace and have been told it
cannot vent thru the flue. It would require 2 vents (1 intake & 1 exhaust)
Given the layout of my basement joist bays, I've been told there's only room
for one (exhaust) and that the unit could use the room air for it's intake. My
question is whether this is code or if I should insist on a concentric (pipe
within a pipe) vent instead. Thank You

ed21
Re: Furnace Venting
ed21

Why use the air in the house when a concentric pipe will combine both into one. It sort of defeats some of the high efficiency part if cold fresh air is being drawn into the house. It seems odd that the installers can't find a way to use two pipes.
Anyway I think one pipe penetration in the house is better than two.

Terry O'Brien
Re: Furnace Venting
Terry O'Brien

Thanks Ed. After watching several Youtube videos, I'm convinced
this is not a good idea. I'll ask that company if they can do it with
the concentric or I'll continue to get more quotes. What I've learned
is that the furnace, by using room air creates a negative air space and
could draw vacuum on the atmospheric vent of the water heater. Not good.

ed21
Re: Furnace Venting
ed21

It never hurts to get more than one quote.

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