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Backflow prevention with 125 mm diameter - Suitable for diameter 125 mm ventilation pipes, ideal as a backflow flap 125 for exhaust systems and compatible with exhaust fan 125 mm, ensures safe installation in flexible and rigid ventilation pipes. Backflap ventilation - Automatic spring mechanism opens when air flow and closes immediately when standstill, effectively prevents backflow and cold draughts in the system. Temperature resistant: -25 to 240 °C. Exhaust flap 125 mm steel - Made of galvanised steel with robust housing, resistant to moisture and mechanical stress for long-lasting use. Easy installation exhaust air flap - Backflow flap extractor can be used directly in ventilation pipes without special tools, suitable for kitchen exhaust air, bathroom ventilation and HVAC systems. Versatile backflow flap - Backflow flap perfect for cooker hood, ventilation systems and exhaust systems, ensures efficient air flow and prevents unwanted airflow.