E-1.1, r. 1 - Regulation respecting energy conservation in new buildings

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110. Where the design temperature difference between ambient air and within a plenum of duct exceeds 15 ºC, the duct or plenum shall be insulated to provide a thermal resistance, expressed in m2 • °C/W numerically equal to at least 0.02 times the difference in temperature in ºC.
O.C. 89-83, s. 110.