Armstrong Air Furnace Venting

Every condensing furnace sold in Canada vents through sealed plastic pipe, and the rules are precise: pipe size and material per the manufacturer's tables, maximum total equivalent length after every elbow, slope back to the furnace so condensate drains, clearance to windows and openings at the termination, and the correct separation between intake and exhaust for two-pipe installations.

The venting work covers the route through the house: where the pipes run, how they penetrate walls and roofs, what the termination looks like from outside, and how the vent condensate drains. In a retrofit, the route often has to thread through finished space, which is where the design matters as much as the pipe.

Code and manufacturer requirements are the two references for every venting job: the installation instructions for the specific furnace (this site links them from every model page) and the gas code provisions that apply in BC. Venting work is done under the gas permit for the installation.