Vent Systems 100 mm / 4" Inch Backdraft Damper Stopper - ABS Plastic Male Fit Dryer Vent Backflow with Shutter - One-Way Airflow Ducting Insert - Inline Fan Vent, Exhaust Pipe Adapter/Connector

Good quality, easy to fit and so far, does a good job. Only time will tell if it lasts?

I bought 2 of these to replace older ones that were no longer swinging shut properly and they work well, keeping out the backdraft when the fan is not in use and keeping the bathroom noticeably warmer. Slides into standard 100mm ducting pipe.

Fitted both of these and the rooms are noticeably warmer. Totally removed the draught coming in from the extractor fans. Will pay for themselves rather quickly I would think.

Worked perfectly for what I needed. Feels solid and well-made, fits as expected, and does exactly what it’s supposed to. No complaints at all.

The item received was a Polish Awenta branded one and is very well made. Butterfly seals properly on reverse flow, and a feature so you can be sure of its orientation once in place (it will only work with the tag at the top. I think). I'd also purchased a cheaper one and it is dreadful by comparison.

All good

Made a big difference to drafts and heat loss in my bathrooms.

Not so versatile, needed to be in a right angle to maximise air output, air out put may is less if fitted in a wrong angle

Bon produit

Good 👍

as expected, light but functional.

parfait

They are exactly what I needed. They work well