Sentence 9.33.6.7.(6)

Intent 1:

To limit the probability of:

• the entry of groundwater into ducts, or
• accelerated deterioration, which could lead to air leakage from ducts or the collapse of ducts.

This is to limit the probability of an inability to maintain the minimum indoor air temperatures [see Sentence 9.33.3.1.(1)], which could lead to condensation, which could lead to deterioration, which could lead to compromised structural integrity, which could lead to harm to persons.