How to use the fan noise player
- Choose a Fan type: Box fan, Ceiling fan or Air conditioner. You can switch while it plays; the sounds cross-fade.
- Press Play (or the Space bar). The fan "spins up" over about a second.
- Pick a Speed: Low, Medium or High. Like a real fan, higher speeds are brighter, a little louder and have a faster blade flutter, and the change takes a moment.
- Turn the Motor hum on or off, and choose the mains frequency used where you live: 50 Hz (most of Europe, Africa, Asia and Australia) or 60 Hz (North America and some other countries). The hum is very quiet, as on a well-made fan.
- Set the Volume and a Sleep timer if you want it to stop on its own. It fades out over the final 45 seconds.
Your fan type, speed, hum and timer settings are remembered in this browser. On a phone, keep the tab open and lock the screen; on most phones the fan keeps running in the background.
Why a fan helps people sleep
Plenty of people cannot sleep without a fan running, even in winter. The appeal is mostly the sound: a fan produces steady, broadband noise that masks traffic, neighbours and household sounds, and its very sameness lets your brain stop paying attention to it. For many, it is also a habit and a cue that it is time to sleep. A virtual fan gives you that sound without the draught, the dust or the electricity bill of running a real one all night, and it is handy when travelling.
How the fan sound is made
There are no recordings on this page. Your browser builds the sound from the same ingredients as a real fan:
- Airflow: turbulent air is essentially random noise. Here it is pink noise passed through a gentle low-pass filter whose cut-off rises with the speed, so a fast fan sounds brighter.
- Body: a low rumble of brown noise gives the sound the weight of a fan housing or an air-conditioning unit.
- Blades: each time a blade passes, the air pressure changes slightly. Engineers call the rate the blade-pass frequency: rotations per second multiplied by the number of blades. The player adds a very slight flutter at that rate. A box fan's blades turn fast, so its flutter is quick and fine; a ceiling fan turns slowly, so you hear a softer, slower whoosh with a gentle swell on each turn. The air conditioner preset has no flutter, as its blower has many small blades, and adds a faint high hiss of air from the vent.
- Motor hum: electric motors and transformers often hum at twice the mains frequency, because the magnetic forces peak twice in every cycle of the alternating current. That is 100 Hz in 50 Hz countries and 120 Hz in 60 Hz countries. The player adds that tone with two quieter harmonics at a very low level. Small phone speakers reproduce little of the fundamental, so you mostly hear the harmonics there.
Slow random drift in the airflow tone keeps the sound from feeling mechanical, and the noise itself comes from long random buffers that never repeat audibly.
Box fan, ceiling fan or air conditioner?
| Preset | Sound | Good for |
|---|---|---|
| Box fan | Fullest airflow with a fine, fast flutter and a slight hum | The classic "fan on all night" sound; masking voices and street noise |
| Ceiling fan | Softer and darker, with a slow, gentle whoosh | Light sleepers who want something calm and low |
| Air conditioner | Steady, deep blower with a faint vent hiss and a more noticeable compressor-like hum | People used to sleeping in air-conditioned rooms or hotels |
If you only want the pure noise without fan character, compare white, pink, brown and green noise. The guide white, pink and brown noise: what's the difference? explains how they differ.
Does fan noise help you sleep?
Fan noise works like any steady background sound: its main, best-supported benefit is masking, making sudden sounds less noticeable so they are less likely to disturb you. Research on noise as a sleep aid is mixed, and reviews have rated the evidence as low quality, so whether it helps depends a lot on the person and the environment. If you are used to a fan, the familiar sound may also help simply because it is part of your routine. It is not a treatment for insomnia or tinnitus; persistent sleep problems are worth discussing with a doctor.
Listening safely
A real fan across the room is not very loud, and a virtual one should not be either. Keep the volume below the level of normal conversation, especially through earphones or headphones and during all-night listening, and prefer a speaker away from your head. The volume slider is capped, but your device volume adds to it. For babies, use our white noise for babies page and keep any speaker well away from the cot. You can check your ears with the online hearing test.
Privacy: the fan sound is generated on your device by your browser. No audio is downloaded or uploaded, and only your settings are saved, in this browser's local storage. For nature sounds and a custom blend, visit the sleep and relaxation sounds page or the sleep sounds mixer.
Frequently asked questions
Why do people sleep better with a fan on?
Mostly because of the sound. A fan's steady noise masks other sounds that could wake you, and for many people it is a familiar sleep habit. Some also like the moving air, which a virtual fan cannot provide.
Is fan noise the same as white noise?
Not exactly. Fan noise is broadband like white noise, but most fans put more energy into the low and middle frequencies, so it is closer to pink or brown noise, with a little blade flutter and motor hum on top.
What is the motor hum, and should I turn it on?
Electric motors often hum at twice the mains frequency: 100 Hz where the mains supply is 50 Hz, or 120 Hz where it is 60 Hz. Turn it on if your real fan hums and you miss it; turn it off for pure airflow.
Does the fan sound keep playing when my phone screen is off?
On most phones, yes, as long as you leave the browser tab open. The sound appears in the lock-screen media controls. Battery-saving modes can occasionally pause background audio.
Is it safe to sleep with fan noise all night?
At a low volume it is generally considered fine for adults. Keep it quieter than conversation, avoid loud overnight listening through earphones, and use the sleep timer if you only need it to fall asleep.
Does a virtual fan use less energy than a real one?
Usually. A phone or tablet playing audio typically uses far less power than a running fan or air conditioner, though it will still drain the battery overnight, so keep it plugged in.
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