Features tamper-proof mounting so that the door can't be removed from outside and a Thermo-Insulated lockout slide. Installation measurements is the opening you cut in the door to install.
How to select the right pet door:
Step 1: Measure your pet from the top of the shoulders to the chest, just behind the front legs.
Step 2: Determine your pet's weight.
Step 3: Select the correct door size based on your pet's measurements and weight.
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