machines for spiral air ducts production. Spiral ducts are made of 137 mm and 140 mm wide spirally rolled steel sheet metal, using so-called tubeformers, i.e. Finish-trim products, like air valves, diffusers, louvres, etc. ![]() clamps, threaded rod, support brackets, self-drilling screw, rivets and for duct fittings without seals - a sealing tape fire and smoke dampers, fire-rated air valves sound attenuators, flexible duct connectors, duct insulation
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