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Design features:

• all intermediate sizes can be delivered in steps of 1 mm
• aluminium frame, double-walled with a full-length drip cap for protection of the cladding
• blades made of aluminium also guarantee corrosion prevention in the area of the cutting edges
• pressure loss kept low by the aerodynamic blades
• easily combined with our multi-leaf dampers (ref. no. 250 - 257)