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An open gable louver leaves a passage between the slats so air can move. A closed louver keeps the outer shape and uses a solid face, so the wall looks like a vent and does not act as one. Use an open louver in a framed opening when that gable is part of how the attic breathes. Use a closed louver where the wall is already sealed, or where the elevation only needs the profile. Both versions are in our range of decorative gable vents. These parts are not a ridge vent, a soffit vent, or a roof tur …