Garage door energy efficiency levels are usually rated in terms of U-values (conductance of heat) and R-values (resistance to heat flow). The higher the R-value, the less heat a garage door will lose. R-16 is better than R-10. If a door's U-value is low, it will lose less heat than one with a higher U-value. Finally, "R" is an imperial measurement, "RSI" is metric. "U" is imperial, "C" is metric. R = 1 / U and RSI = 1 / C.
Source: Garaga, garage door, Inc (www.garaga.com)
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