The Ontario Building Code | Combustible Tubing
6.2.1.12. Combustible Tubing
(1) Combustibletubing for pneumatic controls may be used in buildingsrequired to be of noncombustible construction provided it has an outside diameter not exceeding 10 mm.
6.2.2. ventilation
In Plain Language
Combustible tubing for pneumatic controls may be used even in buildings required to be of noncombustible construction, provided the tubing's outside diameter doesn't exceed 10 mm, a narrow exception for this specific low-risk application.
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.