The first thing you can do to seal the vent off permanently is to treat it like a wall.
Can A Plumbing Vent Go Out A Wall. Problems with plumbing vent pipes. Plumbing vent pipe is installed through a cathedral ceiling and metal roof surface there is no easy access into the roof cavity.
A New Old Way to Vent a Kitchen Island - Fine Homebuilding from s3.amazonaws.com
Will have a drain to carry the water away to sewage. Going up 3' or so above the. Is it permissible to run the vent up to the ceiling and then through the outside wall?
Either way, the vent will have to go directly to the outside, and installed with a vent hood cover.
When plumbing air vents or vent stacks do not work properly, neither will your home's plumbing drainage system. I'd imagine some water heaters could be retrofit with a new vent system but i'm not. When plumbing air vents or vent stacks do not work properly, neither will your home's plumbing drainage system. Also, check out the 4 x 3 closet bend below:
