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Glass wool has a thermal conductivity of 0.022 BTU/hr-ft-degF. What is the thickness in inches of an R-30 layer of glass wool (i.e., R -value

Glass wool has a thermal conductivity of 0.022 BTU/hr-ft-degF. What is the thickness in inches of an R-30 layer of glass wool (i.e., R -value =30 (deg F - ft2 - hr)/BTU

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