Wind – whether on high buildings or in windy regions – is always a challenge for external venetian blind systems. The wind stable external blinds by WAREMA meet the extreme stability and longevity. Measurements at the “Institute for Window Technology” in Freiburg document its suitability until early wind force 10. Thus, the external blinds can be used more frequently even on windy days: This means added convenience and a positive effect on the energy balance. Wind sturdy external blinds can also be retrofitted in many cases. Even retrofitting of existing plants is usually possible.