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Old 01-19-2011, 05:52 AM   #1
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Condensing furnac vent: 4' through roof or 20' through gable?


Hi,

I'm working with contractor to install a new 96% efficient furnace. One of his recommendations seemed odd. When I told him I'd like him to do the roof penetration, he said "we won't mess with the roof, we'll bring it out through the gable."

Well, the roof is 4' above the ports, and the gable is about 20 feet away. Are roof penetrations really that troublesome? A-frame, typical tar shingles with embedded grit.

Thanks in advance!

-Jeff

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Old 01-19-2011, 08:05 AM   #2
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Condensing furnac vent: 4' through roof or 20' through gable?


Have cut the roof many times. If I didn't have to . I wouldn't. I have heard roofers thell that if you cut their new roof . they (roofers ) will void warranty

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Old 01-19-2011, 08:47 AM   #3
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Condensing furnac vent: 4' through roof or 20' through gable?


Jeff, there may be a minimum distance for venting (6' on some makes) but I also would go out the side if it is an option.
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Old 01-19-2011, 03:33 PM   #4
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Condensing furnac vent: 4' through roof or 20' through gable?


Thanks guys, looks like a concensus. Yeah, the manual suggests a superfluous jog (4 elbows) for short runs.
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