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Xiaomi Mi Smart Air Purifier 4
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Specifications
Product details
Specifications, compatibility and what to check before ordering.
Xiaomi Smart Air Purifier 4 is a medium-room air cleaner with a manufacturer-rated particle clean air delivery rate (CADR) of 400 m³/h and effective coverage of 28–48 m². Compare your room size, filter supply and current price before choosing between the 4 Lite, 4 and 4 Pro.
Key specifications
- 400 m³/h particle CADR: Xiaomi’s published maximum clean-air delivery figure.
- 28–48 m² effective coverage: Xiaomi’s room-size guidance, subject to layout, ventilation and fan setting.
- Three-stage filter: pre-filter, Xiaomi High Efficiency Filter and activated carbon for particles and some odours.
- Air-quality feedback: OLED display with PM2.5 reading and colour indicator, plus Auto, Favourite and Night modes.
- Smart controls: supported features in the Xiaomi Home app, including schedules and filter reminders.
- Night Mode: Xiaomi quotes 32.1 dB(A) in its low-noise test; higher fan speeds may sound different.
Choose the right model
The standard 4 sits between the 4 Lite’s 360 m³/h and the 4 Pro’s 500 m³/h published particle CADR. Read our Xiaomi Air Purifier 4 Lite vs 4 vs 4 Pro guide to compare coverage, footprint and filter fit. Buy a replacement filter specified for this exact model and follow its filter-life reminder. Check live stock and price on this page before checkout.
This purifier helps clean indoor air but does not replace ventilation, source control or medical care.
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Questions before you buy
What room size is the Xiaomi Smart Air Purifier 4 for?
Xiaomi recommends an effective coverage area of 28–48 m² and quotes a particle CADR of 400 m³/h. Room layout, ventilation, pollution level and fan setting affect cleaning speed.
How is the standard 4 different from the 4 Lite and 4 Pro?
Xiaomi quotes particle CADR of 400 m³/h for the standard 4, compared with 360 m³/h for the 4 Lite and 500 m³/h for the 4 Pro. Compare room coverage, footprint and filter compatibility before choosing.
Can I control it in the Xiaomi Home app?
Yes. Xiaomi lists supported app features such as schedules and filter reminders, along with an OLED display for PM2.5 feedback and Auto, Favourite and Night modes.
Which filter does the standard 4 use?
Buy a replacement filter specified for the Xiaomi Smart Air Purifier 4. Check the exact filter model rather than assuming a 4 Lite or 4 Pro filter will fit, and follow the filter-life reminder.
