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A non-return valve intended for connection to the air duct on top of the cooker hood. This cold shut-off valve prevents cold air from entering the living spaces through the ventilation output duct connected to the range hood. The metallic spring-loaded flaps of the butterfly valve open when the cooker hood is switched on and close when the hood is switched off. Effectively prevents cold air to flow and condensed water to drip.

The non-return valve is suitable for both 150 mm and 160 mm flue outlet. The non-return valve is installed without a sealing strip when the cooker hood outlet is 160 mm (for example when used with Lapetek X1 models). When the outlet of the cooker hood is 150 mm, install the non-return valve with the supplied gasket.