ULC 641

These requirements apply to factory-built chimney connectors and wall pass-through assemblies that do not require field fabrication.
The factory-built chimney connectors and wall pass-through assemblies are for use with gas, liquid and solid-fuel-fired residential appliances and building heating equipment where the flue-gas temperatures do not normally exceed 650 °C.
Factory-built chimney connectors are intended for use inside buildings to form a connection from an appliance to a factory-built chimney suitable for use with solid fuel, or to a masonry chimney.
The factory-built chimney connectors and wall pass-through assemblies covered by this Standard are intended for installation and use in accordance with the applicable Codes and Regulations as determined by the Authority Having Jurisdiction (AHJ), such as:
a) The National Building Code of Canada;
b) CSA B139 Series, Installation code for oil-burning equipment;
c) CSA B149 Series, Natural gas and propane installation code; and
d) CSA B365 Series, Installation code for solid-fuel-burning appliances and equipment.