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TM-4400-18

IGMA TM-4400-18-Voluntary Guidelines for IGU Cavity Width Manufacturing Tolerances

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The cavity width of an insulating glass unit (IGU) after fabrication varies based on changes in temperature, barometric pressure and elevation above sea level. The purpose of this guideline is to present voluntary manufacturing tolerances for IGU cavity width reduction at the point and time of IGU manufacturing. The guideline is not intended to address the dynamic aspect of cavity width variability once an IGU leaves the point of manufacture where environmental changes occur. Nor does this guideline address naturally occurring solar reflectance.

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