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What is Meant by the Terms Up, Down and Horizontal Heat Flow?

April 26, 2017flow heat horizontal meant terms

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What is Meant by the Terms Up, Down and Horizontal Heat Flow?

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These terms are related to heat flow directions. They are a part of the criteria utilized in R-value testing. For example, when testing a floor assemblage, heat flow down is tested. When testing for a wall system, heat flow horizontal is tested (same for all conductive heat transfer insulations).