Double-deck doors are generally preferred in places where wind loads are higher. Box Twinfold double folding doors are manufactured with bolt nuts with multiple top group systems.

The guiding system is connected to the galvanized sheet supported by the intermediate plates with a bolt nut and a galvanized profile of 40 × 80 mm. The tarpaulin part is combined with modular curtain system of 50 × 125 special design aluminum wind bars. Plastic slides made in the same form are mounted on the ends of the aluminum bars. Surveillance can be provided with transparent glass upon request.

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