The perfect door for extreme climates, the Extreme Weather Pet Door™ protects your home from extreme temperatures while giving your pet the freedom to come and go. This durable door with a 3-flap system delivers maximum energy efficiency that’s 3-½ times higher than our standard single-flap pet doors. Snap-on closing panel included; additional closing panel (sold separately) can be used for added insulation 3-flap system offers protection from the elements Durable plastic frame Product Dimensions: 10 5/8" x 15 1/8". Flap size opening: 8 1/8" x 11 ¾".