7.2.2 Conditions and limits for application of conversion rules to total sound power level7.2.2.1 ApplicabilityConversion rules for the total sound power level though with additional restrictions, can be used under similar circumstances to those outlined in 7.1.4. It shall be appreciated, however, that the conversion of sound data applies to the same points of fan rating as related by the conversion rules for air performance data given in 7.1.4.