PART 7 — PLUMBINGUpdated for the 2024 Ontario Building Code
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7.5.9.3.Installation Conditions
(1) Air admittance valves shall not be installed in supply or return air plenums, or in locations where they may be
exposed to freezing temperatures.
(2) Air admittance valves shall be installed in accordance with the manufacturer’s installation instructions.
(3) Air admittance valves shall be rated for the nominal pipe size of vent pipe to which they are connected..
(4) Installed air admittance valves shall be
(a) accessible, and
(b) located in a space that allows air to enter the valve.
(5) Drainage systems shall have at least one vent that terminates to the outdoors in conformance with Sentence
7.5.6.5.(1).
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Code text is reproduced for reference from the Ontario Building Code (O. Reg. 163/24, 2024 Building Code Compendium). This page is provided for general information and is not an official copy. Always verify requirements against the official Ontario Building Code and confirm with your local building department.