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Air purifiers for a 215 sq ft roomAir purifiers for a 20 m² room

Needs 240 m³/h (142 CFM) of smoke CADR. Why? 20 m²215 sq ft · A large bedroom or a small living room

Picked by the BuyBySpecs Team

BuyBySpecs on YouTube · sources checked 1 Nov 2026

3 picks for 215 sq ft3 picks for 20 m²

Just enoughAHAM verified

Levoit Core 300

Levoit · Core 300

Really cleans
217 sq ft20 m² 20 m²217 sq ft
New filter
every 6–8 months
See it on Amazon: Levoit Core 300

Covers 217 sq ft20 m² (20 m²217 sq ft) · no spare

Why it's here: The smallest verified model that still covers this room. It will run near its top speed.

Specs, sources and trade-offs

Also big enough for 215 sq ft20 m²

Levoit Vital 100S-P

Levoit

AHAM verified

Really cleans
217 sq ft20 m² 20 m²217 sq ft
Box says
1,066 sq ft99 m² 4.9× overstated
New filter
6–12 months

Blueair Blue Pure 511i Max

Blueair

AHAM verified

Really cleans
233 sq ft21 m² 21 m²233 sq ft
Box says
1,138 sq ft106 m² 4.9× overstated
New filter
9 months

Levoit Vital 200S-P

Levoit

AHAM verified

Really cleans
381 sq ft35 m² 35 m²381 sq ft
Box says
1,862 sq ft173 m² 4.9× overstated
New filter
6–12 months

Winix 5510

Winix

AHAM verified

Really cleans
385 sq ft35 m² 35 m²385 sq ft
Box says
392 sq ft36 m² about right
New filter
12 months

Winix T810

Winix

AHAM verified

Really cleans
411 sq ft38 m² 38 m²411 sq ft
Box says
2,006 sq ft186 m² 4.9× overstated
New filter
12 months

6 bigger verified models cover it too, but each is more than twice the size this room needs, so we leave them out here. See every purifier.

Big enough on paper, but not verified

The CADR for these comes from the maker only, so we never make them a pick. We show the maths so you can compare.

Coway Airmega 150

Coway

Not verified

Really cleans
233 sq ft21 m² 21 m²233 sq ft
Box says
1,035 sq ft96 m² 4.4× overstated
New filter
6–12 months

Coway Airmega AP-1512HH Mighty

Coway

Not verified

Really cleans
355 sq ft32 m² 32 m²355 sq ft
Box says
1,748 sq ft162 m² 4.9× overstated
New filter
6–12 months

Coway Airmega Mighty2

Coway

Not verified

Really cleans
365 sq ft33 m² 33 m²365 sq ft
Box says
1,800 sq ft167 m² 4.9× overstated
New filter
12 months

Coway Airmega 200M

Coway

Not verified

Really cleans
374 sq ft34 m² 34 m²374 sq ft
Box says
1,748 sq ft162 m² 4.7× overstated
New filter
6–12 months

Rabbit Air A3

Rabbit Air

Not verified

Really cleans
391 sq ft36 m² 36 m²391 sq ft
Box says
1,070 sq ft99 m² 2.7× overstated
New filter
12–24 months

Coway Airmega 400S

Coway

Not verified

Really cleans
499 sq ft46 m² 46 m²499 sq ft
Box says
3,120 sq ft290 m² 6.2× overstated
New filter
6–12 months

Coway Airmega 350

Coway

Not verified

Really cleans
536 sq ft49 m² 49 m²536 sq ft
Box says
2,640 sq ft245 m² 4.9× overstated
New filter
12 months

The box says yes. The maths says no.

These are sold as big enough for 215 sq ft20 m², but at 4.8 air changes an hour they aren't.

  • GermGuardian AC4825E Cleans a 153 sq. ft. room in just 12.5 minutes or up to 743 sq. ft. every hourCleans a 153 sq. ft. room in just 12.5 minutes or up to 743 sq. ft. every hour (69 m²) really 150 sq ft14 m²
  • Coway Airmega 100 Purifies 810 ft² in 60 minsPurifies 810 ft² in 60 mins (75 m²) really 164 sq ft15 m²
  • Levoit Core Mini-P Changes the air in a 254 ft2 room once per hourChanges the air in a 254 ft2 room once per hour (24 m²) really 51 sq ft4 m²
  • Levoit Core 200S-P Changes the air in a 672 ft2 room once per hourChanges the air in a 672 ft2 room once per hour (62 m²) really 137 sq ft12 m²
  • Xiaomi Smart Air Purifier 4 Compact It can purify a 48 m² room 2 times per hour (517 sq ft)It can purify a 48 m² room 2 times per hour really 206 sq ft19 m²

Before you buy for 215 sq ft20 m²

What 215 sq ft20 m² looks like

A large bedroom or a small living room: about 13 × 16 ft (4 × 5 m)about 4 × 5 m (13 × 16 ft). With a 2.5 m ceiling that's 50 m³ of air to pass through a filter 4.8 times an hour.

How the picks differ

Spare air: 65% for the Levoit Core 400S-P, none for the Levoit Core 300 and 100% for the Blueair Blue Pure 311i Max. The more air to spare, the slower and quieter it can run here to keep up (more on noise).

Only the Levoit Core 400S-P and Blueair Blue Pure 311i Max have a PM2.5 sensor with auto mode. None has an ionizer.

New filters: every 6–12 months for the Levoit Core 400S-P, every 9 months for the Blueair Blue Pure 311i Max and every 6–8 months for the Levoit Core 300 (filters). The Levoit Core 300 is the most compact at 36 cm tall and 3.6 kg; the Levoit Core 400S-P stands 52 cm and weighs 5 kg.

High ceilings

With a 2.7 m ceiling this room needs 260 m³/h of smoke CADR, with 3 m 288 m³/h. At 3 m only the Levoit Core 400S-P and Blueair Blue Pure 311i Max still cover it. For a high ceiling, look at the 269 sq ft25 m² picks. (Why ceilings matter)

Open-plan

If this room opens onto a kitchen or hall with no door between, count it too. Add 54 sq ft and you're at If this room opens onto a kitchen or hall with no door between, count it too. Add 5 m² and you're at 269 sq ft25 m²: of the picks here, only the Levoit Core 400S-P and Blueair Blue Pure 311i Max still cover it. (Open-plan spaces)

One purifier or two?

A large bedroom or a small living room: one purifier is enough, as long as the door to the next room is shut or you count that room too (when it isn’t).

Where to put it

In a large bedroom or small living room, put it where you sleep or sit, not tucked into a corner or behind a chair. (Where to put it)

How these were chosen

  1. Only models whose verified smoke CADR gives 4.8 air changes an hour in 215 sq ft20 m² with a 2.5 m ceiling: at least 240 m³/h.
  2. Our pick is the smallest model with 25% more air than the room needs, so it needn't run flat out. Each card says why it's there.
  3. We don't test purifiers ourselves. The CADR behind every pick is certified by AHAM; the filter and feature facts are the makers' own, and each model's page links to them.
  4. No prices, and brands can't pay to be included. The full method

Other room sizes

Smaller: 161 sq ft15 m²Bigger: 269 sq ft25 m²

Not exactly 215 sq ft20 m²?

Enter your room and ceiling height. Room pages round up to the next size.