Introducing The new, award winning, patent pending, Let Meow't® Window Mounted Cat Patio allows your indoor cat to step outside for fresh air at their own convenience. A Breath of Fresh Air for Indoor Cats. Now your indoor cat can enjoy the fresh air of the out doors without leaving the security of your home. The Let Meow't® Window Mounted Cat Patio installs like an air conditioner in a single or double hung window (Windows that slide up and down) with an opening of 24"-36" wide. Your cat goes through a switch back tunnel with wind blocking curtains that keep the cool air out and your heat in, or vice-versa depending on your climate. Once inside, your cat has a nice carpeted area to lie down on and view the outdoors from the ventilated patio enclosure.