Xiaomi Smart Air Purifier 4 Pro (White, 40cm x 40cm x 40cm)

What room size does this air purifier effectively cover?

This purifier covers up to 60 square metres effectively. For optimal performance in larger spaces consider the ceiling height and room layout. Open-plan areas may require positioning the unit centrally for best air circulation. The coverage area assumes standard 2.4-2.7 metre ceiling heights typical in UK homes.

How often do I need to replace the HEPA filter?

HEPA filter replacement depends on usage and air quality conditions but typically ranges from 6-12 months. The unit monitors filter condition and displays replacement notifications. Heavy use in dusty environments or homes with pets may require more frequent changes. Replacement filters are available through Xiaomi or authorised retailers.

Does this air purifier work with smart home systems?

Yes this model connects to the Mi Home app for smartphone control and scheduling. Users can monitor air quality remotely, adjust settings and receive filter replacement reminders. The app also provides historical air quality data and usage statistics. Integration with other smart home platforms may require third-party solutions.

How loud is this air purifier during operation?

The unit operates quietly on lower fan speeds making it suitable for bedrooms and offices. Customer reviews consistently mention the quiet operation during normal use. When air quality drops the fan automatically increases speed which creates more noise temporarily. Sleep mode reduces noise levels further for overnight use.

What types of pollutants does the HEPA filter remove?

The certified HEPA filter removes particles including dust mites, pollen, pet dander, smoke particles and bacteria. The multi-stage filtration system also includes activated carbon for odour removal. However it does not remove gases like carbon monoxide or volatile organic compounds which require specialised filters.

Can I use this air purifier continuously without damage?

Yes this purifier is designed for continuous 24/7 operation. The 50-watt power consumption makes constant use economical. Continuous operation actually improves air quality maintenance compared to intermittent use. The motor and components are rated for extended operation with proper filter maintenance.

What power supply does this unit require?

This purifier operates on standard UK 240-volt mains power through a corded connection. No battery operation is available despite the lithium battery specification in the technical details. The power cord length allows flexible positioning within rooms. A standard UK plug adapter is included for immediate use.

How do I know when the air quality improves?

The built-in air quality sensor provides real-time readings displayed on the touch panel. The display shows PM2.5 levels and overall air quality status through colour-coded indicators. Users report noticeable improvements in air freshness and reduced allergy symptoms within hours of operation. The app also tracks air quality trends over time.