Xiaomi Smart Air Purifier 4 Pro
No store we follow ships this model to the United States. This page says what it can do, and which similar robots you can buy here.
Which robot is right for your home? Find out in 7 questions →
Before you buy, compare it with 2 recommended alternatives
No store here sells this model today, so beside it the highest-scored model for the same room size that one does, and the cheapest of the top 10.
Green is the best of these 3, also when they share the lead.
| This model Xiaomi Smart Air Purifier 4 Pro | Highest score here Blueair Blue Pure 311i+ Max Best on 1 fact | Cheapest of the top 10 Blueair Blue Pure 311i Max Best on 1 fact | |
|---|---|---|---|
| Price and ranking | |||
| Lowest price | – | $224Blueair (brand store) best | $229Blueair (brand store) |
| Score | not in our ranking | ||
| Rank | – | rank 2 of 9 for open-plan spaces | rank 1 of 9 for open-plan spaces |
| Customer rating | – | – | – |
| Room size | |||
| Room size same on all | open-plan spaces | open-plan spaces | open-plan spaces |
| Size, noise and age | |||
| Height lower is better | 26.8 in (68 cm) | 21 in (53.3 cm) | 19 in (48.3 cm) best |
| On the market since | – | April 2025 | December 2024 |
Facts as the maker states them. A dash means the maker does not name it. Each model’s page gives the source of every fact. Noise is the maker’s own figure, so we do not judge it, and a customer rating only counts from 20 reviews.
Xiaomi Smart Air Purifier 4 Pro specifications
The numbers that matter first, then every fact by group. As published by the maker or the store we read it from.
Consumables: The filter lasts about 6 months.
Cleaning performance 4 facts
- Clean air delivery rate (CADR)
How much clean air the purifier delivers an hour, measured with smoke, dust and pollen. A higher figure cleans a bigger room or the same room faster.
- 294 cfm (500 m³/h)
- CADR measured to
The test the CADR comes from. AHAM AC-1 and the DOE test are independent and comparable. A maker's own test is not.
- GB/T 18801 (Chinese standard)
- Room size we compare on
The room size where the purifier changes the air 4.8 times an hour under a 2.5 m ceiling, worked out from its CADR. We use it so every model is compared on the same rule.
- 449 ft² (42 m²)
- Room size the maker claims
The room size the maker states. Makers use different rules, so we show it but never rank on it.
- 646 ft² (60 m²)
Filter 4 facts
- HEPA filter class
How fine the filter is. True HEPA and H13 catch at least 99.97% of particles at 0.3 microns. HEPA-type is a weaker claim with no test behind it.
- Not stated
- Filter layout
Whether the particle and carbon layers are one filter or separate ones. Separate filters let you replace only the part that is spent.
- One combined filter
- Activated carbon filter
A filter of activated carbon that takes out smells and some gases. It does not catch particles.
- yes
- Replacement filter part number
- M15R-FLP-GL
Running costs 1 fact
- Filter life
How long the maker says a filter lasts, in months of normal use. A filter that is spent cleans less.
- 6 months
Noise and power 3 facts
- Noise at the lowest speed
The sound level at the lowest speed, as the maker measures it.
- 34 dB
- Noise at the highest speed
The sound level at the highest speed, as the maker measures it.
- 65 dB
- Power at the highest speed
The power the purifier draws at its highest speed.
- 50 W
Air quality sensing 3 facts
- Air quality sensors
What the purifier measures in the air. A particle sensor lets it speed up and slow down by itself.
- PM2.5, PM10, Temperature, Humidity
- Particle sensor
- Laser
- Automatic mode
The fan speed follows the air quality the sensor reads.
- yes
Smart features and warranty 1 fact
- Voice assistants
Which voice assistants the robot works with, such as Google Assistant or Alexa.
- Alexa, Google Assistant
Build 4 facts
- Height
How tall the purifier is. It decides whether it fits on a shelf or under a window sill.
- 26.8 in (68 cm)
- Width
- 275 mm
- Depth
- 275 mm
- Weight
What the purifier weighs. It counts most if you move it from room to room.
- 15 lb (6.8 kg)
Warranty and certification 1 fact
- Maker model numbers
- AC-M15-SC
Sources: mi.com
Frequently asked questions about the Xiaomi Smart Air Purifier 4 Pro
What size of room is the Xiaomi Smart Air Purifier 4 Pro for?
The Xiaomi Smart Air Purifier 4 Pro is sized for a room of about 449 ft², the room size we compare it on. Its clean air delivery rate (CADR) is 294 cfm, measured to GB/T 18801 (Chinese standard).
How often does the Xiaomi Smart Air Purifier 4 Pro need a new filter?
The maker gives the filter a life of 6 months.
How loud is the Xiaomi Smart Air Purifier 4 Pro?
The maker states 33.7 dB at the lowest speed and 65 dB at the highest.
