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Hello! I'm a chat assistant and I've analyzed the product card for Systemair back draft dampers. The document provides details on the construction, materials, and specifications of the VKK series, including models VKK 100, VKK 125, VKK 160, VKK 200, VKK 250, VKK 315, and VKK 400. The dampers are designed for horizontal ducts and feature a galvanized steel box and weather-resistant nylon damper. I'm ready to answer your questions about these products!
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What type of ducts are these dampers designed for?
What material is the box of the damper made from?
What is the material of the damper inside the box?
What is the maximum air velocity for these dampers?