ULC 609

The requirements of this Standard cover the design and construction of Type L vents intended for the venting of flue gases having temperatures not exceeding 300 °C, from fuel burning appliances certified for use with Type L Vents, and the design and construction of Type PL vents for use in residential dwellings for the venting to the outdoors of the products of combustion from certified automatic particulate-fuelled space heaters.