How does a humidistat extractor fan work and why might it suit my bathroom?

A humidistat fan measures the moisture in the air and switches on automatically when humidity rises, so you don’t need to remember to press a button. Many models also include a timer so the fan keeps running for a set period after humidity drops. That automatic action is ideal in a busy family bathroom where showers raise humidity quickly. For continuous low-level ventilation you can choose specific continuous-running models such as the Vent‑Axia 479089 that combine continuous mode with humidistat and timer.

Should I choose a 100mm fan or a 150mm fan for my room?

Use a 100mm fan for small toilets and modest bathrooms; most 100mm fans on offer give flows around the lower L/s band (typical options in the 19–24 L/s range). Pick a 150mm fan when you have a larger bathroom, an en‑suite with regular showers, or a kitchen, because those models can deliver much higher flowrates (some reach 61–67 L/s). For example, an Xpelair 100mm Simply Silent is great for a small family bathroom, while an Airflow Aura 150mm suits a larger bathroom or kitchen.

Will a humidistat fan be quiet enough for a bedroom‑adjoining bathroom?

Yes — several ranges are built for low noise, with quiet options labelled Silent or Simply Silent and some models rated as low as 12 dB. Typical quiet bathroom fans sit in the mid‑20s to low‑30s dB, which is unobtrusive for most people. If the bathroom adjoins a bedroom, look for the Simply Silent or Vent‑Axia Silent ranges and check the dB figure before you buy.

Can I use a humidistat extractor fan in my kitchen?

You can, but only some models are specified for kitchens; filters show a small number marked for Kitchen or Kitchen + Utility. Kitchens usually need higher flowrates, so choose a 150mm kitchen‑rated fan such as the Airflow Aria or Aura models for stronger extraction. If you have a kitchen without a hood, the higher flow 150mm options are the safer choice.

Which brand or range is best if I want reliable, quiet automatic extraction?

Xpelair, Vent‑Axia and Airflow are the most prominent brands here, and each has quiet ranges — Xpelair’s Simply Silent, Vent‑Axia’s Silent lines and Airflow’s Quiet/Aria ranges. Xpelair Simply Silent models often combine humidistat and timer and come in both 100mm and 150mm sizes, giving a good balance of low noise and price. If you prioritise continuous low‑level ventilation plus humidistat control, Vent‑Axia offers continuous‑running options alongside silent performance.

Humidistat Extractor Fans

Humidistat extractor fans operate when humidity levels within the room get too high, meaning no more worrying about needing to press a button or pull a cord yourself. They are very convenient and are ideal for use in a busy family bathroom, where people don't always remember to turn on the extractor fan! Options with a timer are available where the timer will continue to run the extractor fan for a predetermined amount of time.

Within our collection, you’ll find the biggest brands such as Airflow, Airvent, Manrose, Vent-Axia, and Xpelair, all at the lowest price with free delivery. You’ll also have the option of 100mm or 150mm fans depending on where you want to install them.

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Xpelair Simply Silent DX100HTS 100mm Square Extractor Fan with Timer and Humidistat with Kit

Xpelair Simply Silent Timer and Humidistat Square Extractor Fan with Fitting kit 100mm - DX100HTS

4.8

11 ratings

£48.99 inc
VAT

Save £5.86 | Was £54.85

Xpelair Simply Silent DX150HTS 150mm Square Extractor Fan with Timer and Humidistat

Xpelair Simply Silent Timer and Humidistat Square Extractor Fan 150mm - DX150HTS

5.0

7 ratings

£74.95 inc
VAT

Save £11.37 | Was £86.32

Xpelair Simply Silent LV100HTS 100mm Low Voltage Square Extractor Fan

Xpelair Simply Silent 100mm LV100HTS Timer & Humidistat Extractor Fan with Fitting Kit - Square

£101.20 inc
VAT

Xpelair Simply Silent C6HTS 150mm Square Contour Extractor Fan with Timer and Humidistat

Xpelair Simply Silent Contour Timer and Humidistat controlled Square Extractor Fan 150mm - C6HTS

4.5

4 ratings

£99.99 inc
VAT

Save £16.14 | Was £116.13

xpelair-simply-silent-contour-timer-and-humidistat-controlled-with-interchangable-facsia-extractor-fan-100mm-c4htrs

Xpelair Simply Silent Contour Timer and Humidistat Extractor Fan 100mm - C4HTRS

4.8

26 ratings

£70.43 inc
VAT

vent-axia-silent-variable-speed-timer-and-humidistat-controlled-extractor-fan-100mm-vasf100htv

Vent-Axia Silent Bathroom Extractor Fan 100mm - Humidistat & Timer 479087

£113.56 inc
VAT

vent-axia-silent-continuous-running-humidistat-timer-controlled-100mm-extractor-fan-vasf100htc

Vent-Axia Silent Continuous Running Bathroom Extractor Fan 100mm - Humidistat & Timer 479089

4.8

4 ratings

£126.52 inc
VAT

Save £16.48 | Was £143.00

vent-axia-silent-timer-and-humidistat-controlled-100mm-extractor-fan-vasf100ht

Vent-Axia Silent Timer & Humidistat Controlled Bathroom Extractor Fan 100mm - 477436B

4.5

4 ratings

£104.40 inc
VAT

Humidistat Extractor Fans

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Xpelair Simply Silent Timer and Humidistat Square Extractor Fan with Fitting kit 100mm - DX100HTS

Xpelair Simply Silent Timer and Humidistat Square Extractor Fan 150mm - DX150HTS

Xpelair Simply Silent 100mm LV100HTS Timer & Humidistat Extractor Fan with Fitting Kit - Square

Xpelair Simply Silent Contour Timer and Humidistat controlled Square Extractor Fan 150mm - C6HTS

Xpelair Simply Silent Contour Timer and Humidistat Extractor Fan 100mm - C4HTRS

Vent-Axia Silent Bathroom Extractor Fan 100mm - Humidistat & Timer 479087

Vent-Axia Silent Continuous Running Bathroom Extractor Fan 100mm - Humidistat & Timer 479089

Vent-Axia Silent Timer & Humidistat Controlled Bathroom Extractor Fan 100mm - 477436B

Manrose Quiet Humidistat Controlled 100mm Extractor Fan - CQF100H

Airflow Aria Quiet 100mm Humidty and Timer controlled Extractor Fan - 90001050

Airflow Aura 150mm Humidity and Timer Controlled Extractor Fan - 9041353

Airvent Humidistat Controlled Extractor Fan 100mm - 459294A

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