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

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.

Really like the quality of the WeCooper range of dampers and NRV. I use these when I can and have 3 In use personally. Unfortunately, I wanted a 125mm dia, and couldn't locate this size in the WeCooper range.

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

Perfect for my hood when fitted vertically. The spring is just the right strength and the rubber seal at one end fits perfectly into the hood fitting

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

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.

Works well with my in line extractor fan

Just the job

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.

Buen producto, metálico y no llega humo del vecino.

Passt perfekt in ein 150er Rohr. Dichtet perfekt ab und funktioniert wie vorgesehen. Keine Zugluft mehr!

Ottimo prodotto, sigilla perfettamente. Installato su una cappa aspirante.

Het is maar een pijpje van 10cm waar hij nu in zit maar ik heb het buitenste rooster wel moeten verwijderen omdat de ramen beslagen waren. Verder is het van goede kwaliteit en past het goed in de buis met wat extra vilt-plakband