Interpretation ANSI/RESNET/ICC 301-2014-018, Ventilation Run Time: The Interpretation Request (IR) sought clarification: whether when an installed whole house mechanical ventilation system lacks controls, or where such control system is not set up, powered or wired to ensure the system provides continuous or intermittently “programmed” ventilation at the time of a rater’s final inspection qualifies as a Whole House Mechanical Ventilation System; what the impact is on air exchange and fan energy, and; whether the “daily run hours” shall be determined by the controller setting at the time of a rater’s final inspection, or shall it be set at the maximum possible runtime the controller could provide, or shall it be set to meet the runtime of ASHRAE 62.2 assuming sufficient ventilation airflow is present to meet the standard. See the SDC 300 response at No. 301-2014-018. Interpretation ANSI/RESNET/ICC 301-2019-002, Ventilation Run Time: The interpretation is the same as No. 301-2014-018 and applies to Standard ANSI/RESNET/ICC 301-2019. (No. 301-2019-002)
