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
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.
Rationel products are tested and approved according to the
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