Kair MultiFan – Inline extractor Fan
- Powerful in-line extractor ideal for bathrooms, kitchens, offices, and ventilation projects
- Two-speed fan lets you choose between quiet airflow or higher extraction when needed
- Supports up to 5m duct runs (without bends) for flexible installation
- Compact and discreet – fits neatly in ceiling or loft spaces
- Backed by a 2-year Kair warranty for added peace of mind
SKU: KAIKMF100S QS Code: QS53237 
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| Manufacturer Code: KMF100S | |
| Dimensions (mm) | WHL 167190246 |
|---|---|
| Airflow (l/s) | MinMax 4052 |
| Power (Watts) | MinMax 2133 |
| Decibels (dB) | MinMax 2736 |
| IP Rating | IPX4 |
| Spigot Size (mm) | 96 |
| Colour | White |
| Warranty (Years) | 2 |
| View All Technical Details | |
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How to wire low and high speed settings ( Video Guide)
Terminal designations:
L1: minimum speed terminal
L2: maximum speed terminal
- QF: automatic circuit breaker
- S: external speed switch
- ST: external switch (for example, light switch)
- X: input terminal block
All electrical wiring must be carried out by a qualified electrician in accordance with local regulations and safety standards.
Kair MultiFan In-Line Extractor Fan
Improve airflow and eliminate condensation with the Kair MultiFan In-Line Extractor Fan, designed for discreet installation in bathrooms, kitchens, utility rooms, and offices. Available in 100mm, 125mm, and 150mm sizes, this high-performance fan delivers powerful extraction (up to 187 m³/h) while remaining quiet in operation – just 27 dB(A) at 3 metres.
Its compact, lightweight design makes it ideal for ceiling voids or loft spaces, especially in applications where noise and visibility must be minimised. The MultiFan supports duct runs of up to 5 metres, making it perfect for flexible ventilation layouts in both new builds and retrofit projects.
Key Features:
- Powerful inline fan for ducted ventilation systems
- Available in 100mm, 125mm, and 150mm variants
- Quiet performance: ~27 dB(A)
- Compact, low-profile housing for easy installation
- Suitable for bathrooms, kitchens, offices, and more
- Compatible with timer and humidistat controls
- 2-year manufacturer warranty
Applications:
Ideal for continuous or intermittent ventilation in domestic and light commercial settings. Helps reduce condensation, control odours, and improve air quality.
4 reviews for Kair MultiFan – Inline extractor Fan
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Questions and answers of the customers
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Morning
atm i have a light mounted extractor which has broken so im changing it over to this product would it be efficient for this ? also i have a couple of bends in the attic that goes out of one of my roof tiles with flexi hose. does this matter or do i need to change the hose probably 1.5 metre in length with motor in the centre of it ?
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QMorning atm i have a light mounted extractor which has broken so im changing it over to this product would it be efficient for this ? also i have a couple of bends in the attic that goes out of one of my roof tiles with flexi hose. does this matter or do i need to change the hose probably 1.5 metre in length with motor in the centre of it ?answer nowA Good morning Gary.Mixed Flow fans like the KMF100S to tend to be more efficient compared to ceiling mounted fans and small showerlite fans (like MANID100S), to the increased extract rate of 52l/s. Also, the duct run length doesnt seem excessively long, so the length and 2 bends are ok, but if you can change flexible for Rigid duct, that would give a better performance, but you would require all ducting laid in the loft to be insulated and if you are ducting out through a tile vent, you should have a condensation trap at the bottom, before the fan. This will prevent moisture condensing and dropping into the fan.Kind regards, Marc
I am looking for a replacement 100 mm fan for ventilation on a ship, it is not switched but needs to run continuously. Is this product suitable or can you recommend one that is? Thank you
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QI am looking for a replacement 100 mm fan for ventilation on a ship, it is not switched but needs to run continuously. Is this product suitable or can you recommend one that is? Thank youanswer nowA Good afternoon Lucy. It isnt designed to run continuously.You could look at multiple extract units, as they are designed to run constantly and can cope with pretty long duct runs.It might be worth looking at the Domus CMX-Multi. We have it on a reduced price of £291.82 at the moment, and have it in stock in our Sidcup showroom. This unit takes 204x60 ducting, but it can be converted to round ducting if needed. If you need more information about it, give me a call on 020 8463 9514.Kind regards, Marc
Hi
What size are the holes in the base plate for mounting? I need to buy some rubber vibration isolation mounts to minimize transmission of vibration into the building structure when installing, need to know the diameter of the holes to order the right size mounts.
Thanks
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QHi What size are the holes in the base plate for mounting? I need to buy some rubber vibration isolation mounts to minimize transmission of vibration into the building structure when installing, need to know the diameter of the holes to order the right size mounts. Thanksanswer nowA Hi Adam. The holes are 5mm.Kind regards, Marc
David –
Brilliant extractor fan 🤩 super easy to install and really quiet 🤫. Great value for money too. Definitely recommend!
Matthew –
Does the job well. Good airflow on the high setting (there are two speeds, but I haven’t tested the lower one). The wiring diagram was pretty useless, and when I asked for help, they just told me to call an engineer. Found a YouTube video instead—much easier to follow. Once the wiring was sorted, fitting it was simple. It runs fairly quietly, especially since I mounted it on the wall instead of the ceiling. Overall, happy with it.
Wilson –
Great value for the money. The wiring took some time to figure out due to unclear instructions, but once installed in the loft, it runs quietly. The clips and brackets made fitting easy. I expected it to run constantly at low speed like my previous fan, but it needs to be switched for that. The key feature for me was the overrun timer up to 30 minutes is perfect.
Jay –
My bathroom never had an extractor fan, so I used to run a dehumidifier after every shower. I installed this Kair fan with a timer by taking a permanent live and switched live feed to a new isolator wiring was simple once I accessed the terminals.
What I really liked was being able to wire the fan in the loft while assembling the chassis on the landing. I fitted it with flexible insulated ducting and mounted it on rubber grommets for stability.
Timer setup took a couple of tries, but adjustment was easy. The fan’s extraction is excellent, it’s quiet but powerful, easily holding a paper to the inlet. Now I don’t need the dehumidifier, and I barely hear the fan from other rooms.
Great value for money, and I’m very happy with the quality and performance.