The Xpelair C4HTSR is our best all-round bathroom extractor fan for a typical short duct: it combines two selectable speeds with a humidistat and run-on timer, while its published low-speed noise figure is notably restrained. It is not the universal answer, however. A long or restrictive duct may need the pressure of the Manrose CF100T or MF100T, while a continuously running system calls for a purpose-designed unit such as the Brookvent Airstream DMEV 100 HT.
Choosing by appearance alone is a mistake. The route, duct diameter, number of bends, room size, required controls and bathroom electrical zone all matter. We compared current UK products against manufacturer information for airflow, noise, control type and intended installation. We have not claimed hands-on testing, and a suitably qualified installer should confirm the final specification and location.
Our top pick
Xpelair C4HTSR
It is the most balanced replacement for a conventional 100mm bathroom fan when you want automatic humidity control, an adjustable overrun and a choice of two installer-selected airflow rates.
Best options at a glance
| Fan | Our award | Key specification | Best for | Main compromise |
|---|---|---|---|---|
| Xpelair C4HTSR | Best overall for a short duct | 15 or 21 l/s; humidistat and adjustable timer; IPX4 | Typical bathroom wall or ceiling installations needing automatic humidity control | The speed is selected during installation rather than changed day to day. |
| Airflow iCON 15 | Best design-led basic fan | 19 l/s; 100mm duct; IPX4; optional control modules | A neat short-duct installation where the iris shutter and appearance matter | Timer and humidity functions require a separately purchased compatible module. |
| EnviroVent SIL100T | Best quiet timer option | 26 l/s (95 m³/h); 26.5dB; 8W; IP45 | A straightforward timer-controlled replacement on a short 100mm duct | It provides timer control rather than an integral humidity sensor. |
| Manrose CF100T | Best centrifugal choice | 25 l/s (90 m³/h); timer; centrifugal impeller; IPX4 | Longer or more resistant 100mm duct runs | Its published 42dB noise figure is higher than the axial alternatives. |
| Brookvent Airstream DMEV 100 HT | Best continuous-running fan | Continuous low rate; humidity and timer boost; up to about 23 l/s | A designed continuous extract strategy with humidity boost | It must be commissioned as part of the ventilation strategy, not used like a simple on/off fan. |
| Manrose MF100T | Best inline mixed-flow option | 100mm inline mixed-flow fan; three speeds; timer; up to 68 l/s | Hiding the fan in a loft or duct void while serving a demanding route | It needs accessible remote mounting, suitable ducting and a separate room grille. |
On a phone, swipe the table sideways to compare every column.
How we chose these products
We first separated short-duct axial fans from centrifugal, mixed-flow, inline and continuous-running products because they solve different installation problems. We then checked current product identities and availability, using manufacturer pages or technical literature for material performance claims. Noise figures are not perfectly comparable unless test methods and operating points match, so they are decision aids rather than a league table.
Best overall for a short duct
1. Xpelair C4HTSR
Xpelair's Simply Silent Contour model covers the needs of many replacement projects without pretending that one setting suits every room. The installer can select 15 or 21 litres per second, and the humidistat and run-on timer reduce reliance on somebody remembering to switch extraction on and leave it running. Xpelair publishes 15dB at the lower setting and 29dB at the higher setting at three metres, so the quiet claim depends on which airflow is chosen.
Key specification: 15 or 21 l/s; humidistat and adjustable timer; IPX4.
Choose it if: you have a short, conventional 100mm route and want humidity plus timer control in one unit.
Skip it if: your duct is long, heavily bent or otherwise restrictive; get the route assessed before buying another axial fan.
Best design-led basic fan
2. Airflow iCON 15
The iCON 15's camera-style iris shutter closes when the fan is off, creating a cleaner face than a conventional louvred grille. Airflow publishes 19 litres per second, 28.8dB at three metres and 9.4W. The important buying detail is that this base listing is not automatically a humidistat or timer fan: Airflow's plug-in control modules are optional. Budget for the correct module and confirm wiring requirements if you need anything beyond switched operation.
Key specification: 19 l/s; 100mm duct; IPX4; optional control modules.
Choose it if: you value the closed iris design and want a reputable 100mm axial fan for a short route.
Skip it if: you assume timer or humidity control is included, or need a fan suited to high-resistance ductwork.
Best quiet timer option
3. EnviroVent SIL100T
EnviroVent's SIL100T offers a stronger published airflow than the two axial picks above while retaining a restrained 26.5dB manufacturer figure. The adjustable overrun timer suits bathrooms where the fan is triggered with the light and needs to continue clearing moisture afterwards. Its IP45 rating is useful, but it does not remove the need for the installer to select a permitted location and follow zone requirements.
Key specification: 26 l/s (95 m³/h); 26.5dB; 8W; IP45.
Choose it if: you want an axial 100mm fan with a timer and a clear manufacturer performance specification.
Skip it if: automatic humidity sensing is essential or the route needs pressure rather than free-air volume.
Best centrifugal choice
4. Manrose CF100T
The CF100T is the purposeful choice when duct resistance is the main problem. Manrose describes the centrifugal design as suitable for longer duct runs and publishes 25 litres per second, a 90m³/h extract rate and an adjustable run-on timer. That pressure capability comes with a bulkier format and a higher 42dB published noise figure, so it is not the default recommendation for a simple through-wall installation.
Key specification: 25 l/s (90 m³/h); timer; centrifugal impeller; IPX4.
Choose it if: an installer has identified a longer or more restrictive duct where an axial fan may underperform.
Skip it if: the route is short and low noise or a very slim faceplate is your priority.
Best continuous-running fan
5. Brookvent Airstream DMEV 100 HT
This is a decentralised mechanical extract ventilation unit intended to run continuously at a low rate, with the HT version adding humidity and timer control. Brookvent's literature shows selectable working points and a boost output of roughly 23 litres per second. Its very low energy figures are attractive, but dMEV only works properly when the selected background and boost rates match the dwelling's ventilation design and replacement air can enter the room.
Key specification: Continuous low rate; humidity and timer boost; up to about 23 l/s.
Choose it if: you specifically need a continuously running, installer-commissioned bathroom extract solution.
Skip it if: you want a direct like-for-like switched fan without reviewing the whole-room ventilation approach.
Best inline mixed-flow option
6. Manrose MF100T
The MF100T moves the motor away from the bathroom grille and uses a mixed-flow impeller to develop more pressure than a basic wall fan. Manrose publishes three selectable speeds and up to 68 litres per second, making it useful for a demanding route or where an inline layout is preferable. The quoted maximum is not a promise of room performance: duct losses, chosen speed, termination and access for maintenance all need to be designed correctly.
Key specification: 100mm inline mixed-flow fan; three speeds; timer; up to 68 l/s.
Choose it if: you have a suitable accessible inline location and an installer has designed the duct route around it.
Skip it if: there is nowhere safe and accessible to mount the unit, or you need a simple wall-mounted replacement.
How to choose a bathroom extractor fan
Start with the duct, not the controls. A short, straight wall duct can suit an axial fan. Longer runs, several bends or restrictive grilles increase resistance and may favour centrifugal or mixed-flow equipment. Overspecifying free-air volume does not guarantee useful installed performance.
Choose the operating pattern. A timer continues extraction after the light is switched off; a humidistat can respond automatically to rising moisture; and a decentralised mechanical extract fan is intended to run continuously at a low rate with boost when required. Check whether any sensor or control module is included rather than optional.
Check noise in context. Published dB figures depend on speed and test distance. Duct turbulence, loose fittings and a poor external grille can make a quiet motor sound intrusive. Smooth, correctly sized ducting and careful mounting matter.
Treat installation as safety-critical. Bathroom electrical zones, isolation, IP rating, wiring and Building Regulations ventilation requirements need to be considered together. Use a suitably qualified electrician or competent installer and follow the exact product instructions.
Frequently asked questions
What is the best type of extractor fan for a bathroom?
For a short wall duct, an axial fan may be suitable. Longer or restrictive runs may need a centrifugal or mixed-flow solution. An installer should assess the route.
Is a humidistat bathroom fan worth it?
It can be useful where moisture varies or users forget to switch the fan on. Correct placement and commissioning matter, and it should complement rather than replace good heating and ventilation habits.
How long should a bathroom extractor fan run after a shower?
There is no single time for every room. A timer should be set long enough to clear humidity for the room, season and duct system without running unnecessarily.
Can I install a bathroom extractor fan myself?
Bathroom electrical work and fixed wiring can be hazardous and subject to specific requirements. Use a suitably qualified electrician or installer.
Why is my bathroom extractor fan noisy?
Noise can come from the fan, undersized or restrictive ducting, loose fittings, a dirty grille or vibration. Inspect and clean safely, then ask an installer to assess persistent noise.
Will an extractor fan stop bathroom mould?
Effective extraction helps reduce excess humidity, but mould can also involve cold surfaces, heating, leaks or insufficient airflow. Address the underlying cause as well as cleaning safely.
The bottom line
For a conventional bathroom with a short, straightforward 100mm duct, choose the Xpelair C4HTSR. Its installer-selectable airflow, humidistat and run-on timer cover the controls most households need in one unit. A longer or restrictive duct may instead require the pressure of the centrifugal Manrose CF100T; choose the Brookvent Airstream DMEV 100 HT only for a designed continuous-running system, or the Manrose MF100T where an accessible inline installation suits the route. Ask the installer to assess the duct first, then choose the fan type that matches it.
For the wider project, read our guides to planning a bathroom renovation, bathroom renovation costs and planning a wet room.
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