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Posted by on January 11, 2007, 2:26 am
>We need to replace our 20 yr old furnace, and were considering getting a 90+
>efficiency furnace. But then they'd have to vent it out of the wall, and we
>have a big deck above where it would come out of the wall. Code requires
>that the venting cannot end under a deck, so the options are to put a hole
>in the deck and run it above the deck (which wouldn't look that great when
>we're on the deck), or to run it under the deck and extend it about 12 ft
>under the deck, so it vents at the end of the deck.
>
>Problem is we live in Minnesota, so the venting in this last method would
>have to be heavily insulated.
>
>Some contractors say this running the venting under the deck for 12 feet
>with insulation would be no problem, they do it all the time, it never
>freezes and they say it's listed as an acceptable method in their
>installation manuals (i.e., for a Carrier furnace), it meets code, and they
>don't have problems when its done properly.
>
>Other contractors say to never do that because the piping would surely
>freeze when that much of it is in the open, leading to all kinds of
>problems.
>
>Which contractors should we believe? Is the under the deck method OK to do,
believe the contractor who puts it in writing with a guarantee to
fix it if it fails to perform to specifications.
>or would it freeze? If we did the venting above the deck, is there an easy
>way to make it so it doesn't look so out of place and so we don't bump into
>it and risk the piping breaking (especially in cold weather)?
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