Omlet Window Box:
The box goes around your window and is attached to the wall around it. This works for most windows, including ones that slide open or opens in or out.
Just measure your window and the height from the ground, put this into the configurator above and it will calculate the size you need. You can then attach another part of the cat tunnel system at either side or straight out from the box by cutting the mesh.
Omlet Window Board:
Perfect for sash windows or other windows where you can safely slot in the board when the window is open.
Saw the board to the correct width of your window, attach the frame ends and secure using a screw driver. The board has a secure cat flap, from which you can start your cat tunnel system.
If you want to, you can also combine a window box with a window board.