The Ontario Building Code | Installation Conditions
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 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) Every drainage system shall have one vent that terminates to open airin conformance with Sentence 7.5.6.5.(1).
Section 7.6. Potable water Systems
7.6.1. Arrangement of Piping
In Plain Language
Air admittance valves must be installed under the specific conditions set out in this article, addressing accessibility, location, and other factors that affect the valve's reliable operation.
This is a plain-language summary of the 2012/2017 Ontario Building Code text above, for general understanding only and not a substitute for the Code. Always confirm current requirements against the 2024 edition (O.Reg. 163/24) or a qualified professional before construction.