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U value
a measurement of heat transmission. The U value of a window is measured
by the number of BTU's that will pass through each square foot of area
per degree of temperature difference from one side of the window to the
other (the lower, the better). U value = the number 1 divided by the R
value.
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united inches (UI)
the sum total of one window width and one window height expressed in
inches.
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