The Grille hood exterieur serves as an external ventilation grille to cover the ventilation pipe. Ready to install with dowels and screws included. The non-return valve can be used universally in all common round ventilation pipes and flexible pipes according to DIN EN 1506. The stainless steel is weatherproof and corrosion-resistant. FUNCTION The ventilation grille 125 is mounted on the outer wall of the exhaust air system. When the fan stops, the slats close automatically and prevent the entry of cold air and the ingress of dirt, insects and other objects. Due to the ease of movement, the flaps open at very low pressures, which is why they are also called floating flaps. VERSATILE APPLICATION Suitable for extractor hoods, workshops, cellars, tumble dryers and much more. Typical rattling noises should be observed when installing next to living areas. PERFECT CHOICE for hobbyists and professionals. Simple installation with standard tools. Insert the ventilation flap into the ventilation pipe or flexible pipe and fix it to the wall with the screws provided. Attach clamping eyes to the ventilation pipe for optimum fixation.