I am building a small bathroom on the first floor of my house. I need a vent but cannot access the main stack above the water line. I was thinking of going straight through the roof of the first floor (see diagram) with a 2" vent pipe. I dont want this vent to pass in front of the window so I was hopping I could terminate below it. I know the code does not allow that. So my other solution was to just get out of the roof and install a cheat valve. I cannot find anything describing that online so just wanted to see what you guys think about it.

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  • Are you thinking of a negative pressure check valve? No gas can get out but allowed air in at a very low pressure ? I have lived in a few places these are legal my Dad used to put a large loop in the wall with one of these but I don't know if they are legal that was over 40 years ago... – Ed Beal Jul 13 '18 at 23:02
  • Yes, they are legal indoors I just have never seen them outdoors. – DonO Jul 13 '18 at 23:12

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