WeCooper 100mm - 4 inch Connector with Backdraught Shutter, Non-Return Damper Flap to Connect Duct Pipe or Flexible Hose Pipe

Good for horizontal application as spring closure counteracts gravity where the free swinging tye would stay open. Spring force does not absorb too much of the fan flow. Easy to fit at end of the ducting just before the external louvre. Good quality and value considering.

Very well made, all dimensions correct, perform perfectly ( although I'm using it with AEG kitchen hood which in full trhotle pumps 700 cubic meters of air per hour, on lowest settings probably about 150 ) with it works perfectly.Spring holding back draft flap is quite strong, than if someone going to use it with not as such powerful units (like washing air dryers etc) might not be suitable, but it's just my guess, can't tell for sure, you need to baisycly try it.

Good fit

Well made but simply not fit for purpose. The springs are too strong for either bathroom or kitchen extractors. With a lot of effort the springs can be weakened to allow for gravity to close the shutter when mounted vertically but not when mounting horizontally.

Good product, done the job

Similar to a lot of others it was too stiff to open with the bathroom extractor but worked after changing the springs, good quality though

Fits perfectly and mostly does its job but as others have said the springs are too strong so I recommend removing one of them being metal no doubt its durable and haven't really noticed any noise the seal is good and its as simple as pushing it in

Slotted neatly between fan & hose; rubber gasket ensures a decent seal when flaps are closed. Springs were a little too strong for vertical use (mounted on ceiling fan) but was easy to twist the arms round so that the flaps were simply held down mostly by gravity; utility room is far warmer now, and fan still works when it needs to.

Prodotto ottimo. Purtroppo non era compatibile con il foro della mia cappa per pochi millimetri. Peccato

je suis resté 15 ans sans clapet anti retour au niveau de ma hotte, à devoir mettre du papier aluminium sur la grille et l’enlever à chaque usage. J’ai même l’impression que ma hotte aspire encore mieux qu’avant depuis que le clapet anti retour est installé, et évidemment je n’ai plus le froid qui rentre dans la maison. Je recommande

C'est un clapet anti retour en métal avec un joint en caoutchouc. Il est solide, bien construit et efficace.

Le produit n'est pas peinten blanc comme pourrait le laisser paraître la première photo. J'ai dû supprimer un ressort sur les 2 pour que le clapet puisse s'ouvrir au moment de la dépression d'air. Produit correct et fonctionnel.

Pour PAC eau chaude