Vent Pipe Running Through Exterior Wall

Maine Homestead

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Hey all! We are trying to figure out how to vent out our grey water system. We will have a kitchen sink, shower, and a bath sink. The house is located in Maine and we have 3in of exterior polyiso insulation as well as interior insulation.

I was planning to attach a 2in vent to the bath sink for all three fixtures. Pretty much the only path to run the vent pipe to the roof is in a 2x6 exterior load bearing wall. Are there any issues with running the vent pipe in an exterior wall? With our exterior insulation, I am not too concerned that the pipe will get frost, but just want to get other opinions on this.
 
it can be done but certain distance to window or door are required
 
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