RK 4 inch Backdraft Shutter 100mm Ducting Connector Galvanized Steel with Rubber Sealing Fits Only with Metal Ducts

Great product have tried numerous different products and this seems to work best for me

After numerous plastic backdraught shutters this one really does work. Installed vertically in my cooker hood which vents through the roof. There is the occasional flap noise when the wind is high but this is preferably to a constant down draught into the kitchen. Low setting on the hood is sufficient to lift the flaps and expel smells and steam. Overall - really pleased and seems built to a good standard.

Works perfect

Easy to fit on top of the ceiling extractor fan. OK, I had to change the associated fittings a bit, but the job was done and dusted within an hour. Since then (about three weeks ago) there has been no rattling in the wind and the fan is working better than it did before.

This product seems quite well made for the price. It has rubber dampers to stop tapping / rattling noises and closes completely and opens sufficiently wide that the existing ceiling fan is more efficient.I ordered this after measuring the existing fan and checking the technical specifications of the existing ceiling fan. The tubing that the draught excluder is built into is precisely the size of the fan (100mm). Logic would determine that it would be 2-3mm larger at the end that attaches to the fan so it can slide on making a neat and airtight seal. Instead, it sits exactly on top of it. This would be a huge problem on a horizontal fan. I’ve had to tape this in place to make a seal and prevent it moving when the fan is in use or air blowing through the ducting from outside.This is the reason for the lower stars or it would most likely get 4/5.Good product let down my illogical design flaw.

Ordered 2 and installed 2, 1 vertically and 1 horizontally.Take note of how to lay it if installing it horizontally.Both are effective more so the vertical fan.It was picking up the draft and wind so easily to turn blades quickly. Now they dont move even in strong winds.Install tip. No need for more extractor hose (I bought some but didnt use or need it). Simply make a cut where you want to install, trim the wire that is exposed and then gently slide the hose on both ends securing with strong tape (electrical t-rex or gorrila) or zip ties.Quick and easy especially after the first one.Ordered another for another ensuite fan.

I bought two of these.One to put next to an inline extractor fan in the attic and one for above the kitchen extractor fan as we were getting major draughts through both and they have made a huge difference!Both draughts have now gone and the extractors still appear to work as well as they did previouslyI expected to hear some clattering as we're on the coast and it gets very windy but in the 6 months or more that we've had them I've only heard the one in the attic once or twice and it must have been when the wind was in a very specific direction.Very happy.. Warmer kitchen and bathroom!

Don't buy this device, it's a nightmare.The baffles drop on the pivot so they are not central to the pipe, then they do not make a seal. A simple washer/collar could have hel them in place.The black plastic baffle seal is too large for the pipe, and has to be remove, then replaced as best possible after insertion of the device into the pipe.Pin and baffle seal aside, the device still does not fit into a 125mm pipe, it is too large. Considerable effort and time was wasted inserting the device without distorting the pin, yes it can be eventually done mm by mm, but is beyond the patience of most.Shoddy construction of the baffle pivot pin, it is poorely riveted and too long, protruding either side of the device.Even with the best effort at modifications, the pin distorts when the device is inserted into the pipe, preventing the baffles from pivoting.