Xiaomi Smart Air Purifier 4

Not sold at any shop we monitor today, so not in our ranking.

Which robot is right for your home? Find out in 7 questions →

Before you buy, compare it with 2 recommended alternatives

No shop 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.

Price and ranking
	This model Xiaomi Smart Air Purifier 4	Cheapest of the top 10 Xiaomi Smart Air Purifier 4 Lite Best on 2 facts	Highest score here Clean Air Optima CA-507 Best on 1 fact
Lowest price	–	€ 129Xiaomi (brand store) best	€ 237Expert
Score			best
Rank	–	rank 5 of 5 for large rooms	rank 1 of 5 for large rooms
Customer rating	–	–	–
Room size
Room size same on all	large rooms	large rooms	large rooms
Size, noise and age
Height lower is better	55.5 cm	53.4 cm best	–
On the market since	–	–	–

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 specifications

The numbers that matter first, then every fact by group. As published by the maker or the shop we read it from.

Clean air delivery rate (CADR)400 m³/h

Room size we compare on33 m²

Noise at the lowest speed32 dB

Filter life6 months

Power at the highest speed30 W

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.: 400 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.: 33 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.: 48 m²

Filter 5 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
Filter parts: 1
Replacement filter part number: M16R-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.: 32 dB
Noise at the highest speed The sound level at the highest speed, as the maker measures it.: 64 dB
Power at the highest speed The power the purifier draws at its highest speed.: 30 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, 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.: 55.5 cm
Width: 250 mm
Depth: 250 mm
Weight What the purifier weighs. It counts most if you move it from room to room.: 5.6 kg

Warranty and certification 1 fact

Maker model numbers: AC-M16-SC

Sources: mi.com

Our score

Confidence: medium. A CADR the maker states itself, or fewer than 300 owners’ ratings. The highest score today is 8.7.

Owners’ ratings 40%–

Owners’ ratings, 40%: none yet at the shops that deliver to the Netherlands, so this part is left out and the score is the features part alone.
Features 60%2.3

14 of 60 points for the maker’s and the registers’ facts.

Price never countsA sale can’t lift a model. Today’s lowest price sits beside the score, checked every morning.
No CADR, no rankOnly air purifiers with a known CADR are ranked. The rest get a provisional score.
Reviewers beside, not insideReviewers’ picks are shown next to the score and do not count in it.

How we work this out →

Frequently asked questions about the Xiaomi Smart Air Purifier 4

What size of room is the Xiaomi Smart Air Purifier 4 for?

The Xiaomi Smart Air Purifier 4 is sized for a room of about 33 m², the room size we compare it on. Its clean air delivery rate (CADR) is 400 m³/h, measured to GB/T 18801 (Chinese standard).