<br><br>The Patio Pacific Cat Door for Vertical Windows is the perfect solution for installing a cat flap in vertical sliding windows. The spring-loaded design is hassle-free, allowing you to easily install or remove the insert without drilling, cutting or framing. Install this pet door for vertical windows into almost any sash window track, without making any permanent alterations to your home. This sliding window cat door insert expands into the furthest point of the track for a snug, weather-tight fit. <br><br>Features:<br> Adjustable widths to fit most vertical sliding window heights with tracks at least 1” wide (it will fit in wider tracks but needs to be secured).<br>Spring-loaded design expands into the highest point in your window track for easy installation (window height must be at least 15” high).<br>5 ⅛"" x 8 ¼"" flexible, plastic flap accommodates small dogs and cats of all sizes.<br>Durable 3/16” single-pane, tempered glass.><br>Lightweight vinyl flap designed for mild climates.<br><br>Benefits:<br>Spring-loaded design of pet door for vertical sliding window allows for installation and removal in a matter of seconds, no tool needed.<br>Choose from four size ranges from 22 ¾"" ‒ 37 ¾"" for the perfect pet door for vertical window fit.<br>Built-in “anti-whoops” feature allows for ¾” adjustment range to account for small errors in measurements.<br>Closing cover snaps on to prevent access in and out when needed.<br><br>Installation Instructions:<br>Step 1: Raise the window<br>Step 2: Place the panel in the track<br>Step 3: Loosen the thumb screws so that the spring loaded piece moves freely and expands in the track<br>Step 4: The sides of the pet door should fit all the way into the tracks on either side. If it is loose then use the extension by sliding it into the spring loaded end<br>Step 5: Remove the cover and start using your door!