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Support for your Dyson HEPA Cool Formaldehyde purifying fan

Dyson HEPA Cool Formaldehyde (White/Gold)

Frequently asked questions

Should I change the fan settings in different seasons?

Increasing airflow will create a cooling effect using purified air, so you may find it beneficial to change your purifier's speed settings as the temperature changes. For personal cooling in summer, use settings 4-10. In colder periods, enable diffused mode. It projects air through the back of the machine, to avoid unwanted cooling.

Does the LCD display stay on throughout the night?

If you're concerned by the brightness of your purifier's LCD display, consider enabling Night-time mode using your remote control or the Dyson Link app. During operation, a small moon icon indicates that your purifier is on, but the main display turns off after 10 seconds to help avoid sleep disturbance.

How do I know when my purifier is in Auto mode?

If auto mode is enabled, AUTO will be illuminated on your purifier's LCD display. When your machine is purifying the air, AUTO will be in white. When the air in the room is purified, it will turn green and your purifier will remain idle until pollutant levels rise.

How long should my purifier be turned on for?

Your purifier's auto mode is designed to manage the air quality in your space without you having to operate the machine – so it's only on when it needs to be.

Where should I place my purifier?

Dyson Experts are on hand to better understand your business environment and can advise about where to place your purifier to best suit your space. When placing the machine, make sure there is at least a few feet of clearance on all sides so that the air can circulate effectively.

Should I keep my windows open or closed?

Your purifier works most efficiently in a sealed environment – opening the windows can allow more pollutants to enter the air inside, which means your machine will take longer to work.

How often do the filters need to be changed?

The formaldehyde-destroying catalytic filter never needs replacing. And we recommend replacing the HEPA+Carbon filter every 12 months (based on 12 hours a day of use) – so this may vary depending on usage and pollution levels. You'll be notified via the Dyson Link app or LCD screen when it's time to replace it.

Do I need to maintain my purifier's filter?

No, unlike some conventional filters which require changing, washing and drying each month, this isn't the case with ours. So there's no time wasted without a working purifier. Our filter is quick and easy to replace – and you'll know exactly when, via the Dyson Link app or LCD screen. Please note that the selective catalytic oxidisation filter never needs replacing.

Replacement parts