This pet door’s flap was also created with innovative design to keep your Ideal Pet’s ears, paws and tails safe and unharmed. Cleaning the flap: Use a clean rag and fresh water to remove any dirt and grime that may accumulate on the flap panel surface. DO NOT USE strong detergents, pine or lemon oil or any type of solvents as these will permanently damage the flap panels and flexible hinges. LEXAN is a trademark of SABIC Innovative Plastics IP BV. For pets 13 - 35 lbs. Flap size 6.625 x 11.25 Cutout size 8.25 x 13.75 Door or wall thickness range 1.25 - 1.75 Maximum energy efficiency