Patio Door Pet Flaps
Some pet flaps are built into vertical, door-height slats called patio door pet flaps. These structures are intended to be installed between existing sliding patio or porch doors and their frames (with locks on both sides of the slat), so that there is no need to make holes in walls, screens or doors. An advantage of the patio door pet door is that it need not be permanently installed; it can be transported with the owner when the owner moves to a new home. These doors are usually made from thermo-plastics or aluminium and can be found in different colours to match the existing patio door they are placed in.
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