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Old 09-22-2009, 08:22 AM   #1
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adapt plenum

I am replacing an old oil furnace with a new high efficiency natural gas furnace. The plenum on the oil furnace is 19"x20" and the outlet on the new furnace is only 16"x14". Can I adapt the larger plenum to fit the new furnace and will this be an issue.

Also any ideas on how to adapt the sheet metal plenum would also be helpful.

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Old 09-22-2009, 10:56 PM   #2
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adapt plenum

Yes, you can do this if the plenum is larger than the funace (but not the other way around). The furnace manufacturer may make a transition adapter for the furnace but I suspect you'll need a custome fabricated transition to match up the dimensions exactly.

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