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Qr = Ventilation airflow rate,cubic feet per minute(cfm)from Equation 15-1 or Table M1505.4.3(1). <br /> Csystem = System coefficient from Table 1505.4.3(2). _ <br /> M1505.4.3.2 Intermittent Off Operation <br /> Whole-house mechanical ventilation systems shall be provided with advanced controls that are configured to operate the system with <br /> intermittent off operation shall operate for a least two hours in each four-hour segment.The whole-house ventilation airflow rate <br /> determined in accordance with Section M1505.4.3 as corrected by Section M1505.4.3.1 is multiplied by the factor determined in <br /> accordance with Table M1505.4.3.2. <br /> Table M1505.4.3.2 <br /> Intermittent Off Whole-House Mechanical Ventilation Rate <br /> Factorsa,b <br /> Run-time%in Each 4-hour Segment 50% 66% 75% ri <br /> 00% <br /> Factora 2 1.5 1.3 1.0 <br /> a. For ventilation system run-time values between those given,the factors are permitted to be determined by <br /> interpolation. <br /> b. Extrapolation beyond the table is prohibited. <br /> Exported by QUpCodes https://up.codes <br />