Please note: This product might take a little longer to arrive as it may be shipped from outside the UK. The PetSafe® Extreme Weather Pet Door is designed to withstand biting cold and excessive heat, the ideal solution to weather extremes. The strongly insulated flap in the middle and double magnetic plates both inside and out help to offer this pet flap two functions. It has a particularly low heat transition coefficient (0.21), leading to up to 3.5 times less heat loss when the flap is closed. It is also excellently insulated, which helps to prevent extreme temperatures in the middle of summer or depths of winter from entering the house, helping to save you on heating costs without meaning your pet must miss out on adventure and freedom. PetSafe® Extreme Weather Pet Door at a glance: Strongly insulated pet flap that protects your house from heat and cold 3-way closing system: with an insulated centre panel and two other flexible panels with a magnet closing system both inside and out Extremely efficient: proven to be 3.5 times more energy efficient than standard pet doors, saving you heating and air-conditioning costs Particularly low heat loss Additional cover included: add or remove with just a click, improving insulation when the flap is not needed Easy DIY assembly: with installation instructions, screws and other necessary parts Polymer frame: a white frame that can be painted to match your door Suitable for doors between 4.1-5.7cm thick Colour: Frame: white Inner and outer doors with magnet close: transparent grey Central insulated door: yellow Material: polymer Sizing table for Petsafe Extreme Weather Dog Flap: Size Pet's weight Total dimensions (L x W x H) Entrance size (W x H) Required cut-out dimensions (wall/door 5.4cm thick) (W x H) Required cut-out dimensions (wall/door 5.4cm thick) (W x H) S Up to 7kg 8 x 21.4 x 28.4 cm 13 x 20.5 cm 16.5 x 25.8 cm 14.2 x 25.8 cm L Up to 45kg 8.3 x 34.1 x 50.8 cm 25.9 x 41.3 cm 29.2 x 48.9 cm 26.9 x 46.4 cm