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Pet Door Window Insert: Easy Installation and Energy Efficient
a cat sitting in the window sill of a house next to an open window
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instructables.com

Pet Door Window Insert From XPS Foam and Double-Pane Glass

Pet Door Window Insert From XPS Foam and Double-Pane Glass: This cat/dog door insert for a double-hung window is made entirely out of Extruded polystyrene (XPS) foam. When properly installed it provides much better thermal insulation than plastic or aluminum inserts. Obviously there is no intrusion securit…
instructables
Instructables

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