It’s normal for your purifier to sound louder at higher fan speeds, since the motor is working harder to move more air. If the noise feels excessive, try selecting a lower speed setting for quieter operation.

Another common cause of increased noise is reduced airflow from a clogged or dirty filter. When the filter is blocked, the fan has to work harder, which can create extra sound. To help keep your purifier running smoothly and quietly:

• Clean the pre-filter regularly to remove dust and debris.
• Replace the main filter according to the recommended schedule.

With routine filter care, you’ll maintain good airflow, reduce unnecessary noise, and get the best performance from your purifier.