The Canadian standard requires the chimney to withstand three 30-minute chimney fires, three times longer than the USA standard. a UL approved Stainless Steel Class “A” Insulated Chimney. You cannot use stovepipe through the window or roof! The Canadian standard requires the chimney to withstand three 30-minute chimney fires, three times longer than the USA.
Stainless Steel Chimney Liner
Stainless Steel chimney flue liners are a more modern product. All stainless steel flue liners are U.L. listed or tested to U.L. 1777 Standards, which means that they have been subjected to a series of tests including three 10-minute 2100-degree burns.
Steel flue liners will withstand exposure to a chimney fire of short duration, but can become damaged in long-burning fires. Steel liners come as rigid or flexible, and in different grades i.e. 304 grade stainless, which is very heavy, or 361 Titanium/stainless steel, which is lightweight, yet sturdy. Your chimney technician will know which type is best for your particular application.
Most flexible steel liners can be custom-shaped to fit the flue as well.
There are basically three types of stovepipe chimney installation.