To limit the probability of a discontinuous air barrier system at penetrations through assemblies, which could lead to a loss of airtightness, which could lead to excessive air infiltration and exfiltration.
Where the air barrier system separates a garage, or suite containing a garage, from residential space, to limit the probability of the leakage of carbon monoxide gas into living space, which could lead to the asphyxiation or acute poisoning of persons.