Endura Door Pet Door
There are 3 important sizes with respect to pet doors:
Flap Size is the most important, so it is listed on the main page. This is the size of the space that your pet will have to fit through.
Cutout Dimension refers to the size of the hole that needs to be cut in a wall to install the pet door.
Outside Dimension is the size of the outside of the frame, which can sometimes be important when installing a pet door in a limited space.
All sizes are given Width x Height.