DESIGNED FOR MEDIUM PETS: This patio dog door features a flap opening of 8.66" W x 12.2" H, perfect for cats or dogs up to 40 lbs. ADJUSTABLE HEIGHT: The durable aluminum patio dog door insert is adjustable in height from 44" to 84.25", ensuring a perfect fit in your existing sliding door track. EASY INSTALLATION: No cutting or complex tools required! This pet door is simple to install without the need for modifications to your sliding glass door. CONTROLLED ACCESS: Manage your pet's access with the closing panel, allowing you to limit their entry when necessary. ENERGY EFFICIENT & WEATHER-PROOF: The durable wire mesh keeps insects out while allowing for indoor air circulation. Clear panels can be added for protection against extreme weather conditions.