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Ours are 9 3/4" X 17". It says so right on the flap. The one I got this from is a Ruff Weather door and has held up for many years. Though this one is on an inside wall ( house to garage) with a flexible flap. On VERY windy days if the garage doors are open it will let air in. On the outside wall we have one with a rigid panel that keeps the wind out better.<BR>
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