Vent Pipe Running Through Exterior Wall

[Maine Homestead]

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.

 

[2020Bob]

it can be done but certain distance to window or door are required