PART 7 — PLUMBINGUpdated for the 2024 Ontario Building Code
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7.6.2.10.Vacuum Breakers
(1) Where the critical level is not marked on an atmospheric vacuum breaker, pressure vacuum breaker or spill-resistant
pressure vacuum breaker, the critical level shall be taken as the lowest point on the device.
(2) Where an atmospheric vacuum breaker is installed, it shall be located on the downstream side of the fixture control
valve or faucet so that it will be subject to water supply pressure
(a) only when the valve or faucet is open, and
(b) for periods of continuous use not exceeding 12 h.
(3) An atmospheric vacuum breaker shall be installed so that the critical level is at least the distance specified by the
manufacturer for safe operation of the device, but not less than 25 mm above
(a) the flood level rim of a fixture or tank, or
(b) the highest point open to the atmosphere in an irrigation system.
(4) A pressure vacuum breaker or spill-resistant pressure vacuum breaker shall be installed so that the critical level is
not less than 300 mm above
(a) the flood level rim of a fixture or tank, or
(b) the highest point open to the atmosphere in an irrigation system.
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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.