My furnace is working fine. It is vented out the front of the house. Why does it have such a strange odor outside only when the furnace turns on?


The only foul smells (rotten egg-like) I'm aware of have been a result of a bad heat exchanger. I'm not saying for sure that's you because I don't know what you're smelling but usually, there is no bad odor from these vents.

Updated on February 16, 2018

Original Article:

How to Figure Out What is Wrong With Your Furnace
By Dan Robbins