Closed building conditions shall begin at least 12 hours prior to the beginning of the measurement period for measurements lasting less than 96 hours.32 ILAC 422.130.(b)(B)
Are you notifying the seller/agent/representative of this requirement when booking the inspection? If not, how do they know of this requirement?
Think about it
If 12 hours CBC’s are not observed, the test must be at least 96 hours.