VENTSSilenta 100mm (4-Inch) Diameter Bathroom Extractor Fan with Humidity Sensor and Run-on-Timer. Outer size 157x159x21mm. Low energy consumption - White

First things first, don't put the cover on until you're satisfied you've got it set up as you want it, as it's a very snug fit and can be quite awkward to get off again (especially up in the top corner of a bathroom close to ceiling and walls where these are often located). Before you put it on, it is probably worth gently sanding or shaving down the retaining lugs a little bit. Obviously not too much or they won't be able to do their job, but enough so the cover can be removed when needed.Secondly, if you are not comfortable with electrics and how they work, then get somebody who is comfortable or a professional electrician to install it for you. If you are going to do it yourself then make sure you isolate it first, let anybody else that's about know you're doing it so they don't accidentally turn the circuit on again, and then before you start disconnecting wires, etc, check the power is actually off with a multimeter or similar so you don't get a shock.My old fan was getting noisier so I decided that it was time to replace it. I found this which seemed to fit my requirements. Specs said it was the same size, had a good extraction volume, had a timer, didn't cost too much and above all was quiet. It took less than 15 mins to fit including getting tools out and putting them away again. Whilst it's only been on for an hour or two, it seems to be fine so far.It'd be nice if there was an arrow on the timer adjustment screw and markings to line it up with for 5, 10, 15, 20, 25, 30 mins etc for the timer to have an idea of roughly how long it'd run for, but a bit of trial and error can soon get it running for about the right amount of time. Not an essential thing, but a "nice to have feature" for the manufacturer to consider for the future.I would also like to have perhaps seen slightly bigger screws and plugs included. Whilst it is nice that they were included and what's included would be perfectly fine for a new install, a lot of people buying these fans will be replacing old ones. These older ones would often have used larger screws and plugs. Since the holes in this one lined up with the old ones by virtue of most fans being the same dimensions, I had to go raid my own stores for the right sized plugs and just re-used the screws from the old fan I was removing. Not a problem for me, but not everyone has things like spare wall plugs lying around.Overall, I'm very impressed with the fan, how quiet it is and how quick and simple to install it was. Especially at this price point. A lot of fans this quiet, are double or treble this price, with some even more than that. Shows just how much money you're often paying just for a branded name on the front.My review is finished, the next bits is just a slightly ranty part aimed at some of the negative reviews I saw and makes me wonder how some people have survived this long.To the idiot reviewers saying "I'm sending this back, it's not silent", etc, of course it isn't silent. I'd say use some common sense, but it doesn't seem to be that common. You'd be very hard pushed to find a truly 100% silent fan that doesn't produce a single decibel of noise. The only sort of "silent fan" I can think of is to open the window and let natural air flow do the job, but the noise from outside is probably more than this generates. Read the "About This Item" section at the very top of the page next to the pictures, it tells you that it generates noise and even list how much (approx 26dB @ 3m). It might not be silent, but it is very quiet and a lot quieter than the old ones used to be. I compared the listed dB with those from much more expensive "branded" fans and it was within 2 or 3 dB different maximum. I also tested with a decibel meter app on my phone and once installed, the difference between it being off and on was only 10-12dB when 1 m away. For a product who's specs say it produces 26dB @ 3m distance, I thought that producing 10-12 @ 1m was very good.Again, if you are not comfortable with electrics and how they work, then get somebody who is comfortable with them or a professional electrician to install it. Remember that a little knowledge can be dangerous. Eg, there's a review from about a year ago with someone listing the item as "Poor" and "Can't get it to work". They claim to have tried connecting the live wire to L, LT and bridging them (so effectively wiring it to both), but still can't get it to work. Of course it won't. The picture they've uploaded clearly shows they only have 2 wires coming in to the fan, a Live (I suspect a Switched Live rather than a permanent live) and a Neutral. The fan requires a Permanent Live AND a Switched Live, as well as a Neutral. The permanent live provides the power to run the fan and the timer countdown, etc, the switched live provides the trigger to start the timer countdown. If you only wire to L you have no trigger, if you only wire to LT you have nothing to power the fan and timer, if you wire to one and bridge L and LT (effectively wire to both) you might be able to start it but it would also turn off with the light (not with the timer), because you've taken away the power to L when the light turns off. I suspect this person has only run a switched live and neutral from the light switch and not a permanent live. This would be fine for a simple "on/off" type fan that works with the light, but is no good for a fan with a timer. If you can't work out simple things like this then you shouldn't be touching electrics at all other than perhaps changing a lightbulb, and even then I'd be worried for your safety.

Great fan, its whisper quiet (not totally silent) and works well. Its way quieter than the last fan I put in and also more effective. I am very happy with it.

Install was relatively easy but instructions are very limited. Does come with screws and ceiling plugs if you need. The one way valve is just a floppy thin piece of plastic so not sure how it will last, but it works for now. Runs very quiet and the overrun on the room light trigger is easily adjustable. Also has a power light so you know it’s on.

Sensitivity is adjustable and it works well. Seems to be a good fit for the job, bathroom.

Easy to install. Nice quiet fan. Very pleased

Fitted and doesn’t work light just flicks on as u pull cord and fan does not work really annoying as I have drilled the wholes to fix this fan now what a waste of time

Bought the fan purely to act as a humidity fan and not to be switched by the ceiling light. The fan arrived in the actual box, no packaging. The box confirmed it was the correct model, put this to one side and then installed the extract hole and wiring (L&N supply only, as its not switched).When I came to fit the fan, the cover was removed and I found that the fan was a different model to what was shown on the box, as this had a L & N + a switched live (SL) connection.I had hoped it was just a standard wiring harness and that the sealed control unit itself was correctly configured for humidity only. I switched it on, and it stayed on for serval hours, both with only a L&N supply and a L, N, SL supply. Although very quiet it never turns off. It was returned to Amazon.

We needed a 'loovent' style extractor fan to replace a discontinued model which was 13cm square. This one has a width of about 17cm and a height of 13.75cm. Due to proximity to the ceiling, some adjustment to the wall was needed for it to fit. The unit is well built and near silent in operation. The backflow vane is a little flimsy, but as the previous fan did not have one at all this should do a better job. As with all mains electrical equipment a qualified electrician should be employed to do the work. The instructions are very clear and the online details are easily available. Before doing any work the electrician will isolate the connection by switching off the circuit at the consumer unit or removing the fuse and testing for no live wires.We noticed from the image attached the wiring sequence is Live Permanent, Live timer, and Neutral. The connector block shows a wire colour sequence of Black, Red and White from top to bottom. This was a little concerning as we would not have expected the live feed (from the connector block) to be black. However, it is fairly obvious the mains connection should be LIve (Red), Live switched (Yellow or grey) and Neutral (Black) from top to bottom. Not sure if there are regulations about wiring colours but as these are within the unit and an electrician is required, not a problem. Pleased with the build quality, quietness and price.