Furnace

What was the aproximate % efficiency of regular contractor grade furnaces in 1991. I do not know make or model.
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m Ransley wrote:

I believe it was about 80%
--
Joseph E. Meehan

26 + 6 = 1 It's Irish Math
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80% at best.
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Talking about GAS right?? Oil could be lower than 80%
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Normally, metal flu pipe and it would likely be 80% (Builder Grade)
If, and that's a big if, it has PVC flu, it would be around 90%+ (Premium Grade)
~kjpro~
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Speakin of..man..you GOT to see the new York concentric vent for the 90%+ units....freaking rocks..

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