Are your Ventis venting systems UL and ULC listed?

Yes. The prefabricated chimney meets UL130HT and ULC-S629. The liners respect UL1777 and ULC-S640. The pellet pipe is certified to ULC/ORD C441, ULC S609 and UL 641, and the double wall stove pipe meets UL103HT and ULC-S641.