Why does the hood knock when it is windy while the hood is switched off, and how can I stop it?
The knocking is most likely caused by wind increasing the chimney draft and making a flap or another part in the hood move [#17768849][#17768985] If the noise is coming from the chimney, clean the chimney; if it is coming from the hood itself, find the part that is knocking and repair it [#17768978] Not every hood has a non-return flap, so check whether yours has one and whether it is moving properly [#17769028][#17769052] A practical fix mentioned is to glue the flap with a piece of self-adhesive sponge to soften the impact [#19696272]
AI summary based on the discussion. May contain errors.
The hood has a non-return valve (flap) that prevents cold air from entering from the outside. When it blows properly in the chimney, a negative pressure is created which causes the flap to be lifted.
The discussion revolves around the issue of a hood being turned off while experiencing knocking sounds during windy conditions. Possible causes include increased chimney draft causing movement within the hood or chimney. Solutions suggested include cleaning the chimney if the issue is located there, or identifying and repairing the specific component causing the noise within the hood. A non-return valve (flap) in the hood may be lifting due to negative pressure created by wind, which can lead to knocking sounds. For new hoods, it is recommended to check for the presence of such a flap. A practical solution offered is to cushion the impact of the flap using self-adhesive sponge material. AI summary based on the discussion. May contain errors.
