Quality

Rationel doors and windows are manufactured at a modern factory with the most up-to-date machinery and systematic quality checks throughout the production process. This is the best guarantee for our overall high quality and superior products.

Danish Window Verification

All Rationel products are DVV-certified. This means that our windows and doors meet the demands defined in VinduesIndustrien's - The Association of Danish Window Manufacturers - technical regulations, regarding both products and production. DVV ensures that all members follow the adopted quality norms, and they undertake factory visits continuously. DVV is previously known as DVC. 

DS/EN ISO 9001:2000

Rationels management system meets the criteria in ISO 9001.

Indoor climate labelling

Rationel Windows A/S has the Danish Indoor Climate label. This guarantees that Rationel products release no toxic gases when installed in buildings.

CE-label

Rationel products are tested and approved according to the official CE-mark.
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