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- For ventilation installations in shafts or for installation in visible areas- Fittings: spot-welded or seam-welded- Sendzimir galvanised- Temperature max.100°C- Ideal for retrofitting- Plastic ring with circumferential double lip seal and tight-fitting rubber membrane that opens in the event of negative or positive pressure- Supplied with two membranes for flow velocities of up to approx. 3.5 m/s or up to approx. 6 m/s.- Temperature application range: -20°C to +90°C
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