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

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136. A system that exhausts air to the outside of a building shall be provided with heat recovery apparatus when the sensible heat content of the exhaust air system, calculated in conformance with sections 137 and 138, exceeds 300 kW and is immediately reusable.
O.C. 89-83, s. 136.