Is there a door encyclopaedia? Yes, there is – from A for abbreviations to Z for Zeroline. You can see, at a glance, which door best meets the requirements. We use certain abbreviations for this, so you can recognise the functions and added values of our products. Go to the “General” section to inform yourself about abbreviations, size relations, door types, door models, specialist terms and standards. This will make it easier to find the right products.