I have a standalong downdraft vent Whirlpool Gold GZ7936XHS-0 that is separate from the stove itself. It goes out via a 6" duct . The ducting for it goes down into the slab, makes A 90º turn and the goes across the kitchen. It comes back up through the slab up by the outside wall, and makes another 90º and exits out through the outside wall. I am about to replace the outside flapper vent which is just a cheap plastic vent like you find for a dryer. THats all that stops it from venting into the house.
My issue is I get a lot of draft,and a lot of outside air that seems to vent into the downdraft. I am looking for any better ways to seal it other than just the outside vent. If I can't I may just cap it and be done with it.
Looking for any suggestions.