Framing Conductance

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Hello, I was entering in my conductance for frames using my U-values for
the frame and was wondering if anyone knows where this expression
originates from out of the DOE-2 help window

FRAME-CONDUCT = 1/[1/(U-value) - 0.197] Btu/ft2-F-h

specifically the 0.197 term

Thank you,

Patrick Darby

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Joined: 2011-09-30
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