Main trade-off
Coway Airmega 400
There is no Wi-Fi app, scheduling or detailed air-quality history.
Head-to-head
Coway Airmega 400 vs Blueair 211i Max: Blueair adds smoke airflow in a lighter cabinet
The short answer
Choose the Blueair 211i Max for stronger smoke airflow in a lighter cabinet. The Airmega 400 fits a mechanical-only preference without app setup.
Before you choose
The reasoning and the trade-offs
Compare room size at the same turnover
At five air changes per hour and an eight-foot ceiling, Coway Airmega 400 calculates to about 492 square feet and Blueair 211i Max to 653.
What this is based on
Area = CADR × 60 / (ceiling feet × air changes per hour). Inputs are 328 and 435 CFM, 8 feet and 5 changes. Smoke CADR is used at maximum speed. Air mixing, furniture, open doors and filter loading affect real conditions.
Main trade-off
Blueair Blue Pure 211i Max
The HEPASilent ionization stage is always active and cannot be disabled.
Coway Airmega 400
- Choose it for
- You want a mechanical-only air path
- You prefer local controls
- Main trade-off
- There is no Wi-Fi app, scheduling or detailed air-quality history.
The Airmega 400 photo shows Graphite, while the Amazon listing selects White. Its purchase link is paused while the exact finish is verified.
Blueair Blue Pure 211i Max
- Choose it for
- A larger room needs more smoke airflow
- You move the purifier from time to time
- Main trade-off
- The HEPASilent ionization stage is always active and cannot be disabled.
About this comparison
Choose the Blueair 211i Max for stronger smoke airflow in a lighter cabinet. The Airmega 400 fits a mechanical-only preference without app setup.
Smoke produces a larger gap than pollen
Winner by situation
Start with what you need it to do
The room is large enough to need extra airflow
At the same five-change target and eight-foot ceiling, the calculated limits are 492 square feet for Coway Airmega 400 and 653 for Blueair 211i Max. Allow margin if you want to run below maximum speed.
- Coway Airmega 400
- Depends
- Blueair Blue Pure 211i Max
- Better fit
The cabinet has to fit beside furniture
Allow 14.8 inches of width and 14.8 inches of depth for Coway Airmega 400, or 14.4 by 14.4 for Blueair 211i Max. Intake clearance is extra, so measure the gap in both directions.
- Coway Airmega 400
- Depends
- Blueair Blue Pure 211i Max
- Depends
I want control from another room
Blueair 211i Max has app control. Coway Airmega 400 uses local controls, which suits a fixed routine but cannot meet a remote-control requirement.
- Coway Airmega 400
- Not suitable
- Blueair Blue Pure 211i Max
- Better fit
The ceiling is ten feet high
At ten feet and five air changes, the modeled room areas fall to 394 square feet for Coway Airmega 400 and 522 for Blueair 211i Max. That is 20% less floor area than the eight-foot example because the purifier has more air to move.
- Coway Airmega 400
- Depends
- Blueair Blue Pure 211i Max
- Depends
What matters in practice
The differences that matter
Compare room size at the same turnover
At five air changes per hour and an eight-foot ceiling, Coway Airmega 400 calculates to about 492 square feet and Blueair 211i Max to 653.
How we reached this conclusion
Area = CADR × 60 / (ceiling feet × air changes per hour). Inputs are 328 and 435 CFM, 8 feet and 5 changes. Smoke CADR is used at maximum speed. Air mixing, furniture, open doors and filter loading affect real conditions.
Measure the cabinet before buying
Coway Airmega 400 occupies a 219-square-inch cabinet envelope versus 207.4 for Blueair 211i Max. A shallower shape can still need more wall width.
How we reached this conclusion
Width × depth: 14.8 × 14.8 = 219 in² and 14.4 × 14.4 = 207.4 in². These are cabinet bounding rectangles, excluding required air clearance.
More smoke airflow without a heavier carry
The 211i Max offers about 33% more smoke CADR while weighing about 34% less than the Airmega 400.
How we reached this conclusion
(435 / 328 - 1) × 100 = 32.6%. (24.7 - 16.2) / 24.7 × 100 = 34.4%. Carry comfort and noise were not tested.
Try your real numbers
Will either purifier move enough clean air?
The result checks hard limits only. Preferences stay out of the calculation.
Coway Airmega 400
Fits these inputs328 CFM of verified clean-air delivery gives about 8.2 air changes per hour here. The 5 ACH target needs 200 CFM.
Blueair Blue Pure 211i Max
Fits these inputs435 CFM of verified clean-air delivery gives about 10.9 air changes per hour here. The 5 ACH target needs 200 CFM.
This uses maximum-speed, pollutant-specific CADR and a five-air-changes-per-hour target. Quieter settings deliver less clean air. It does not substitute raw airflow or a one-change coverage claim.
Choice A
Coway, AP-2015F
Airmega 400
A wide, high-airflow purifier with dual filters, two washable prefilters and simple automatic controls without an app.
- Best matched use
- Large rooms, smoke and allergy control when a mechanical HEPA system matters more than connected features
Checked facts
- Coway rates the platform for up to 3,120 square feet at one air change per hour.
- Its published CADR is 328 smoke, 328 dust and 400 pollen CFM.
- Two washable prefilters protect two combined Max2 HEPA-and-carbon filters.
The Airmega 400 photo shows Graphite, while the Amazon listing selects White. Its purchase link is paused while the exact finish is verified.
Choice B
Blueair, 211i Max
Blue Pure 211i Max
A quiet, efficient large-room cylinder with high CADR, a washable fabric prefilter and useful app automation.
- Best matched use
- Open living areas, pets and smoke when quiet high airflow matters more than deep gas filtration
Checked facts
- Blueair lists a 674-square-foot room size at 4.8 air changes per hour.
- Published CADR is 435 smoke, 452 dust and 450 pollen CFM.
- The 16.2-pound purifier is rated at 23 to 53 dB with app, auto and night modes.
Meaningful differences
What changes the fit
| What changes | Coway Airmega 400 | Blueair Blue Pure 211i Max | Why it matters |
|---|---|---|---|
| Smoke CADR | 328 CFM | 435 CFM | A smoke-specific rate is more useful than a one-air-change marketing room size. |
| Pollen CADR | 400 CFM | 450 CFM | The model with the higher smoke figure does not always have the higher pollen figure. |
| Cabinet width and depth | 14.8 × 14.8 in | 14.4 × 14.4 in | Match both dimensions to the actual gap and leave the manual clearance around the intakes. |
| Remote app control | No app | Included | Remote schedules matter when the purifier sits away from where you spend the day. |
| Automatic sensor response | Included | Included | An app and a pollution sensor perform different jobs. Schedules do not measure air quality. |
| Ionizer or electrostatic stage | none | always-on | Use this preference as a hard constraint if you want a purely mechanical filter path. |
| Published weight | 24.7 lb | 16.2 lb | A fixed location makes a heavy cabinet less troublesome than a daily move upstairs. |
| Rated power | 66 W | 46 W | Rated input is a ceiling comparison. Auto mode and lower fan settings change actual consumption. |
What you give up
Every choice has a cost
If you choose Coway Airmega 400
- Its broad body needs substantial floor space and clearance on both intake sides.
If you choose Blueair Blue Pure 211i Max
- Its fabric prefilter needs periodic vacuuming or washing to preserve airflow.
What matters in practice
How to make the call
Smoke produces a larger gap than pollen
Blueair leads smoke CADR by 107 CFM but pollen by 50. The extra smoke headroom matters most when the room is large enough to push the Coway toward maximum speed.
The stronger-flow model is lighter
The 211i Max is 16.2 pounds against 24.7 for Coway. That 8.5-pound reduction can matter when the purifier alternates between downstairs living space and a bedroom.
Choose the air-cleaning path deliberately
Coway uses mechanical filtration. Blueair uses electrostatic-assisted HEPASilent filtration. Both have automatic modes, so an app preference alone need not decide the purchase.
What this comparison cannot tell you
- CADR uses the maximum rated fan speed. Minimum noise and maximum airflow are different operating points.
- These calculations compare particle-cleaning capacity. They do not promise health outcomes or removal of a specific gas.
What the facts say
What the comparison shows
Useful conclusions from the current air purifiers comparison, followed by the checked facts used to reach them.
Compared set
Only 14 of 70 models checked match every need here: “Wildfire smoke gets indoors”, “I have very little floor space”, and “I want it to react on its own”.
14 matching models from 70 checkedMeasured difference
Blueair Blue Pure 211i Max lists 435 CFM for published smoke CADR, 33% above Coway Airmega 400 at 328 CFM.
- Coway Airmega 400
- 328 CFM
- Blueair Blue Pure 211i Max
- 435 CFM
- Comparable models
- 20 of 70
See the checked facts and calculation notes
Match countThe count uses the current product-to-need assignments for “Wildfire smoke gets indoors”, “I have very little floor space”, and “I want it to react on its own”. A need with no documented match does not count.
Calculation noteThis median uses explicit smoke CADR figures. General maximum-airflow measurements are excluded. 20 of 70 models have comparable published figures for context.
| Product | Needs matched | Checked facts | Source records |
|---|---|---|---|
| Coway Airmega 400 |
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| Blueair Blue Pure 211i Max |
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Ready to choose?
Check the price. Read the owner reviews.
Open either model on Amazon to check the current price, customer reviews and delivery options.
Coway Airmega 400
You want a mechanical-only air path
The Airmega 400 photo shows Graphite, while the Amazon listing selects White. Its purchase link is paused while the exact finish is verified.
Blueair Blue Pure 211i Max
A larger room needs more smoke airflow
See price & reviews on AmazonLinks open in a new tab.