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Automatic closure flap for insertion into the pipe. Prevents warm room air from escaping and unwanted cold air from entering when the fan is switched off. Automatic function in both negative and positive pressure operation (rotatable installation position) thanks to spring locking. For horizontal flow, position the axis of rotation vertically. For vertical flow, only functions in ascending air flow. Housing made of galvanized sheet steel, flaps made of aluminum, return spring made of stainless steel. ,
| Property | Value |
| Suitable for duct fans: | yes |
| Type of mechanical accessories: | other |
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