Horizontal Measurement Instructions
Please note: Our PVC base is 5/8" thick. Please let us know if your window tracks are more narrow than 5/8" and we'll taper the edges.
Since your window opens up and down, we ask that you please open the window and put the tape measure in the left side track as far as it will go and then come across to just the edge on the right side. This is the area that you will have to slip past to install.
Once we confirm this measurement, we will get started on your cat door for the window right away.