To limit the probability of the inadequate control of air leakage or inadequate venting, which could lead to deterioration, which could lead to compromised structural integrity of environmental separators or of elements supported or protected by the separators, which could lead to structural failure, which could lead to harm to persons.
To limit the probability of the inadequate control of air leakage or inadequate venting, which could lead to uncontrolled heat loss due to air mass transfer, which could lead to ice damming, which could lead to damage to environmental separators or to elements supported or protected by the separators, which could lead to structural failure, which could lead to harm to persons.