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Can I Leave My Windows Open While Using My PRISM+ Air Purifier?

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PRISM+ Support teamUpdated 2 May 2026

Yes, you can leave your windows open while using your PRISM+ Air Purifier.

However, for the best air purification performance, we recommend keeping doors and windows closed whenever possible.

Why Does Closing Windows Help?

Air purifiers work by continuously filtering the air within a room.

When windows or doors are open:

  • Outdoor air constantly enters the room
  • New dust, pollen, smoke, and pollutants can be introduced
  • The air purifier has to work harder to maintain good air quality

As a result, the purifier may take longer to improve the air quality compared to a fully enclosed room.

 

Will My Air Purifier Still Work?

Yes.

Your PRISM+ Air Purifier will continue filtering the air even when windows are open.

The difference is that the purifier may be processing a continuous flow of new particles entering from outside.

Think of it this way:

Room Condition

Air Purifier Performance

Windows closed

Most efficient

Windows partially open

Effective, but may take longer to improve air quality

Windows fully open

Continues filtering, but outdoor air may reduce overall effectiveness

 

When Should I Keep the Windows Closed?

For optimal performance, keep windows and doors closed when:

Running the purifier for allergy relief

Reducing dust and airborne particles

Improving indoor air quality quickly

During haze, smoke, or high-pollution conditions

Using Auto Mode to maintain a specific air quality level

 

When Is It Okay to Open the Windows?

Opening windows may be beneficial when:

Ventilating the room

Reducing indoor odours

Bringing in fresh outdoor air when air quality is good

After cleaning or cooking

Your air purifier can continue operating normally during these situations.

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