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How many BYU is a Lennox G40UH (x) series furnace? And can it be vented with PVC? Thanks alot!

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The Btu rating for this furnace is 40,000. Since the furnace has a 3 /34" metal flue collar on the top of the unit, you can not use PVC pipe to vent it. Only 90+ efficient gas furnaces can use PVC pipe for venting and the also come equipped with a condensation pump, which yours doesn't.

For more information on your furnace and how it's to be safely installed and vented, here is a link to the installation manual http://www.greenwoodheating.com/products/manuals/gasfurnaces/G40UH.pdf that you can download and print.

Hope this helped answer your questions?

Posted on Mar 18, 2011

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