I own a old house with a 10/12 pitch metal roof and get lots of snow in the winter. My plumbing vents dead end in the attic crawl space above the ceiling of the first floor. I want to run the vent to the outside and cannot run the vent very high up the roof without it becoming a major project. I could come straight through the roof but I am afraid the snow would rip it off in the winter. The only protected place would be in front of a second floor dormer but then the smell might go in the window of the dormer in the summer. Can I run the vent out through the back wall of the house and up the outside of the wall a foot or so leaving the vent to end about a foot under the eave? Other suggestions would be appreciated.