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Hello! I've reviewed the product card for Systemair's back draft dampers, specifically models VKK-100, VKK-125, VKK-160, VKK-200, VKK-250, VKK-315 and VKK-400. This document provides information about their construction, features like profiled vanes for low resistance and robust design, as well as installation guidelines. I'm ready to answer any questions you might have about these products.
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What is the back draft damper designed for?
What material is the damper box made of?
What is the maximum allowed air velocity?