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

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112. Air ducts that circulate heated or cooled air and are located outside of the insulated portion of the building shall be insulated as required in section 51 for walls above ground level, other than foundation walls, separating heated space from unheated space or the outside air.
O.C. 89-83, s. 112.