Sewer Gas Smell Vent Pipe Video
Sewer Gas Smell Vent Pipe - Odor Source
Sewer gas smell can be pulled from a rooftop plumbing vent pipe as the wind blows across it. This is known as the venturi effect and you should have been introduced to this law of physics in high school. That said, you could have been sick that day it was talked about in class!
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You can also get sewer gas smell from a septic tank cleaning procedure.
Tim Carter shows a clever way to stop odors from exiting a plumbing vent pipe on a roof.