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I live in Ontario and just coming out of a major deep freeze and found out the hard way that style of vent shown caused a massive ice dam all around the vent. The vent ended up buried in snow and started to drip into the bathroom. Cleaned off the snow and problem stopped for now, but plan to install a vent stack this spring.


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I have one, I'm in MA, it causes the snow to melt around it, run down to colder areas and freeze, creating ice damns on either side of it. Never had an issue with it being blocked. I plan on changing it out this spring because of this issue, I extended it all the way down the roof two years ago hopping it would correct it, it didn't.



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