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A whole building, building addition or tenant space which includes a DOAS complying with Section C406.6 shall also provide minimum sensible effectiveness of heat recovery of 80 percent and DOAS total combined fan power less than 0.5 W/cfm of outdoor air. For the purposes of this section, total combined fan power includes all supply, exhaust, recirculation and other fans utilized for the purpose of ventilation.

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C406.6 [CE] Commercial Energy Efficiency, Dedicated Outdoor Air System (DOAS)
the International Mechanical Code, shall be served by DOAS installed in accordance with Section C403.6. This option is available to both buildings subject ...