Calculating R-Value. To get the R-value for a specific emissivity level, air space, and direction of heat flow; use the tables in the most recent edition of the American Society of Heating, Refrigerating, and Air-Conditioning Engineers' (ASHRAE) Fundamentals Handbook, if the product is intended for applications that meet the conditions specified in the tables.
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Samples: www.energystar.gov, www.energystar.gov, www.energystar.gov
