Correct vent lengths, slopes, and terminations ward off icing and backdrafts

https://telegra.ph/Top-Signs-You-Need-Furnace-Repair-Insights-from-Canadian-Heating-and-Air-Conditioning-02-23

Correct vent lengths, slopes, and terminations prevent icing and backdrafts, making sure trustworthy exhaust for condensing and non-condensing furnaces.