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As you purchase your Endurance Door through an Installer, they are the holder of your warranty. Should you encounter any issues with your door, they will need to be reported directly to your installer.
If required, your installer will be able to contact Endurance for assistance in rectifying any issues.
In accordance with British Homes Regulations Document-L, Endurance Doors are manufactured to comply with a U-Value equal to or less than 1.4 W/m²