![]() ![]() ![]() Fan systems that exceed the total supply-airflow and outdoor-airflow percentage threshold outlined in Section 6.5.6.1 may choose to trade off the added efficiency of exhaust-air energy recovery via the performance-based compliance path in ASHRAE 90.1-2013. The prescriptive maximum window-to-wall ratio (WWR) is 40% in ASHRAE 90.1-2013, Section 5.5.4.2.1, so buildings can comply prescriptively with ASHRAE 90.1-2013 and have more glass than those complying with 2015 IECC, that has a prescriptive maximum WWR limit of 30% (C402.4.1, without exceptions).Ĥ.
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