PetSafe Extreme Weather Energy Efficient Pet Door, Unique 3 Flap System, White, for Dogs and Cats ENERGY EFFICIENT: Unique three-flap system is rated 3.5 times more energy efficient than single flap doors CENTER INSULATED FLAP: Perfect for hot and cold climates; keeps the warm and cool air inside your home CONTROLLED ACCESS: Snap-on closing panel allows you to keep your pet from using the pet door; use a second closing panel (sold separately) on the outside for an additional layer of weather protection MATCH YOUR DCOR: Paintable plastic frame allows you to match your door color EASY INSTALLATION: Includes detailed instructions, cutting template and installation hardware for an easy do-it-yourself project PET SIZE: Recommended for pets up to 15 lb.; pet door flap opening measures 5.125 in. W x 8.25 in. H PRODUCT SUPPORT: PetSafe brand's U.S.-based Customer Care experts will be glad to help; call Monday through Saturday at 1-800-845-3274 EXPERIENCE: PetSafe brand has been an industry leading U.S. manufacturer of pet behavior, containment and lifestyle products since 1991, helping millions of people and pets each year