• Where access hatches or sump pit covers are installed in an assembly with an air barrier system they must be weatherstripped to prevent air leakage

• Clearance at chimneys and gas vents must be sealed using noncombustible materials to prevent air leakage

9.25.3.3.(7) Where access hatches and sump pit covers are installed through assemblies constructed with an air barrier system , they shall be weatherstripped around their perimeters to prevent air leakage.

9.25.3.3.(8) Clearances between chimneys or gas vents and the surrounding construction that would permit air leakage from within the building into a wall or attic or roof space shall be sealed by noncombustible material to prevent such leakage.