My Philips Air Purifier is too loud

The noise you might hear coming from your air purifier is produced by the operation of the motor and the fan.

Your Philips Air Purifier has been designed to minimize this noise, but in some situations (such as when trying to sleep or in a silent room) you may hear it.

If this is the case, please change the fan speed to a lower level or to sleep mode.

When on auto mode, your Air Purifier uses sensors to detect invisible changes in the air and adjusts the fan speed to restore good air quality as quickly as possible. 

To reduce the noise level of the device, you can adjust the fan speed or switch on sleep mode.
 
For the AC30XX, AC38XX and AC42XX Air Purifier ranges, the Air Purifier’s behaviors reflect the concerns you indicated when setting up the device. Reacting to pollen and dust mites can produce a particularly vigorous response from the Air Purifier and, if it routinely becomes louder than you would like, you may wish to adjust your settings.
 

1. Open the mobile app. 
2. Tap the spanner icon in the top right corner of the home screen.
3. Select Personalize Purifier Settings from the menu.
4. Deselect pollen and dust mites.
5. Select dust/fine dust and haze/smog/PM2.5.