The catch
Blueair Classic Pro CP7i
Compared with the Blue Pure 211i Max, the 32-pound cabinet is much heavier.
Side by side
Blueair Classic Pro CP7i vs Coway Airmega 400: CP7i brings more smoke airflow, Coway skips the app and the ionizer
Quick verdict
The Classic Pro CP7i is the pick for stronger smoke airflow in a shallow cabinet. If you want local controls and a mechanical-only design, the Airmega 400 fits.
Before you buy
Why, and what it costs you
Compare room sizes at an equal turnover rate
Blueair Classic Pro CP7i works out to about 590 square feet and Coway Airmega 400 to 492, at five air changes per hour and an eight-foot ceiling.
Where this comes from
Area = CADR × 60 / (ceiling feet × air changes per hour). The inputs are 393 and 328 CFM, 8 feet and 5 changes, with smoke CADR taken at maximum speed. Air mixing, furniture, open doors and filter loading all affect real conditions.
The catch
Coway Airmega 400
You won't get a Wi-Fi app, scheduling or a detailed air-quality history.
Blueair Classic Pro CP7i
- Why pick it
- The room has space for a wide, shallow cabinet
- Remote scheduling is a draw
- The catch
- Compared with the Blue Pure 211i Max, the 32-pound cabinet is much heavier.
Coway Airmega 400
- Why pick it
- Ionizer hardware is not for you
- A lighter cabinet that needs no app setup is wanted
- The catch
- You won't get a Wi-Fi app, scheduling or a 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.
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What this page compares
Stronger smoke airflow in a shallow cabinet points to the Classic Pro CP7i. The Airmega 400 suits local controls and a mechanical-only preference.
A shallow body opens up more places to put it
Which one fits
Pick the situations that sound like you
The room is big enough to call for extra airflow
With the same five-change target and eight-foot ceiling, the calculated limits are 590 square feet for Blueair Classic Pro CP7i and 492 for Coway Airmega 400. Keep some margin if you plan to run below maximum speed.
- Blueair Classic Pro CP7i
- Better fit
- Coway Airmega 400
- Depends
The cabinet needs to fit next to furniture
Blueair Classic Pro CP7i needs 19.7 inches of width and 9.9 inches of depth, and Coway Airmega 400 needs 14.8 by 14.8. Intake clearance comes on top, so measure the gap in both directions.
- Blueair Classic Pro CP7i
- Depends
- Coway Airmega 400
- Depends
I want to run it from another room
App control comes with the Blueair Classic Pro CP7i. Coway Airmega 400 relies on local controls, which fit a fixed routine but cannot satisfy a remote-control requirement.
- Blueair Classic Pro CP7i
- Better fit
- Coway Airmega 400
- Not suitable
Ceiling height is ten feet
Raise the ceiling to ten feet while keeping five air changes, and the modeled room areas fall to 472 square feet for Blueair Classic Pro CP7i and 394 for Coway Airmega 400. That is 20% less floor area than in the eight-foot example, since the purifier has more air to move.
- Blueair Classic Pro CP7i
- Depends
- Coway Airmega 400
- Depends
In practice
Differences you will notice
Compare room sizes at an equal turnover rate
Blueair Classic Pro CP7i works out to about 590 square feet and Coway Airmega 400 to 492, at five air changes per hour and an eight-foot ceiling.
How we worked this out
Area = CADR × 60 / (ceiling feet × air changes per hour). The inputs are 393 and 328 CFM, 8 feet and 5 changes, with smoke CADR taken at maximum speed. Air mixing, furniture, open doors and filter loading all affect real conditions.
Measure the cabinet first, then buy
Blueair Classic Pro CP7i has a 195-square-inch cabinet envelope, against 219 for Coway Airmega 400. A shallower shape can still call for more wall width.
How we worked this out
Width × depth: 19.7 × 9.9 = 195 in² and 14.8 × 14.8 = 219 in². The cabinet bounding rectangles are measured, and required air clearance is not included.
More airflow doesn't make the machine lighter to carry
Compared with the Airmega 400, the CP7i has about 20% more smoke CADR and weighs about 30% more.
How we worked this out
(393 / 328 - 1) × 100 = 19.8%. (32 / 24.7 - 1) × 100 = 29.6%. Airflow at maximum speed and weights from the manufacturer are separate constraints on the purchase.
Plug in your numbers
Can either purifier keep up with your room?
This checks hard limits only. Personal preferences are left out of the math.
Blueair Classic Pro CP7i
Works with your numbers393 CFM of verified clean-air delivery works out to about 9.8 air changes per hour in this room. Hitting the 5 ACH target takes 200 CFM.
Coway Airmega 400
Works with your numbers328 CFM of verified clean-air delivery works out to about 8.2 air changes per hour in this room. Hitting the 5 ACH target takes 200 CFM.
This uses each model’s pollutant-specific CADR at top speed and a target of five air changes per hour. Quieter settings clean less air. Raw airflow and one-change coverage claims are never swapped in.
Option A
Blueair, CP7i
Classic Pro CP7i
This purifier has a heavy steel cabinet, two filters and a high particle CADR. Because it is shallow from front to back, it can suit a broad wall better than a large round purifier.
- Best for
- A large room with a wide, shallow spot for the unit, where app control is wanted
Facts we checked
- US-model CADR: 393 CFM for smoke, 387 for dust and 441 for pollen.
- The cabinet is 19.7 inches wide, 9.9 inches deep and 23.6 inches tall, and it weighs 32 lb.
- Blueair specifies two filters, sound of 24 to 55 dB and an operating range of 2.6 to 58 watts.
Option B
Coway, AP-2015F
Airmega 400
Wide and high in airflow, this purifier has dual filters, two washable prefilters and straightforward automatic controls, with no app involved.
- Best for
- Large rooms with smoke or allergy problems, if you value a mechanical HEPA system over connected features
Facts we checked
- Coway's rating for the platform is up to 3,120 square feet at one air change per hour.
- Published CADR is 328 CFM for smoke, 328 for dust and 400 for pollen.
- Two combined Max2 HEPA-and-carbon filters sit behind two washable prefilters.
The Airmega 400 photo shows Graphite, while the Amazon listing selects White. Its purchase link is paused while the exact finish is verified.
Spec by spec
Where they really differ
| Spec | Blueair Classic Pro CP7i | Coway Airmega 400 | In practice |
|---|---|---|---|
| Smoke CADR | 393 CFM | 328 CFM | Better to rely on a smoke-specific rate than on a one-air-change marketing room size. |
| Pollen CADR | 441 CFM | 400 CFM | The model that leads on smoke does not necessarily lead on pollen as well. |
| Cabinet width and depth | 19.7 × 9.9 in | 14.8 × 14.8 in | Check both dimensions against the real gap, and keep the clearance the manual calls for around the intakes. |
| Remote app control | Included | No app | Remote schedules matter if the purifier sits far from where you spend your day. |
| Automatic sensor response | Included | Included | Apps and pollution sensors do separate jobs, and a schedule tells you nothing about air quality. |
| Ionizer or electrostatic stage | always-on | none | If a purely mechanical filter path is what you want, treat this preference as a firm requirement. |
| Published weight | 32 lb | 24.7 lb | A heavy cabinet bothers you less if it stays put than if it must go upstairs every day. |
| Rated power | 58 W | 66 W | Rated input is a comparison of upper limits. Actual consumption shifts with Auto mode and lower fan settings. |
Trade-offs
What each pick costs you
With Blueair Classic Pro CP7i
- HEPASilent works through electrostatic charging, so pick a mechanical-only model if you must avoid that air-cleaning method.
With Coway Airmega 400
- The wide body takes up a lot of floor space and needs room to breathe on both intake sides.
Decision guide
How to decide
Pick the Classic Pro CP7i for stronger smoke airflow from a shallow cabinet, or the Airmega 400 for local controls and a mechanical-only preference.
A shallow body opens up more places to put it
Compared with the 400, the CP7i is 4.9 inches shallower and 4.9 inches wider. Side outlets need clear space, so it still shouldn't be wedged into a tight gap.
Smoke throughput goes to Blueair
In our five-change, eight-foot example, the CP7i's extra 65 smoke CFM supports about 98 more square feet. Both claims assume the highest rated airflow.
Weight and filtration suit a different kind of buyer
Coway weighs 7.3 pounds less and uses a mechanical filter path, whereas Blueair uses HEPASilent electrostatic assistance. Settle that preference before comparing cabinet styling.
What this page can’t tell you
- CADR is based on the maximum rated fan speed, and minimum noise and maximum airflow occur at different operating points.
- What these calculations compare is particle-cleaning capacity. Nothing in them promises health outcomes or the removal of a specific gas.
By the numbers
What the data shows
What we found across the air purifiers we compare, plus the checked facts behind each finding.
How many fit
Only 14 of the 70 models checked meet every need here: “Wildfire smoke makes its way inside”, “Floor space is very tight for me”, and “I want it to respond automatically”.
14 models fit, out of 70 checkedThe gap in numbers
Blueair Classic Pro CP7i lists 393 CFM for listed smoke CADR, 20% more than the 328 CFM on Coway Airmega 400.
- Blueair Classic Pro CP7i
- 393 CFM
- Coway Airmega 400
- 328 CFM
- Models with this figure
- 20 of 70
Show the facts and the math
How we countedThe count uses each product's current fit ratings for “Wildfire smoke makes its way inside”, “Floor space is very tight for me”, and “I want it to respond automatically”. A need with no documented match is not counted.
How we calculatedOnly figures stated as smoke CADR go into this median. General maximum-airflow numbers are left out. For context, 20 of 70 models publish comparable figures.
| Product | Needs it meets | Facts we checked | Sources |
|---|---|---|---|
| Blueair Classic Pro CP7i |
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| Coway Airmega 400 |
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Ready to buy
See today’s price and what owners say
Open either model on Amazon for the current price, customer reviews and delivery options.
Blueair Classic Pro CP7i
The room has space for a wide, shallow cabinet
See price & reviews on AmazonCoway Airmega 400
Ionizer hardware is not for you
The Airmega 400 photo shows Graphite, while the Amazon listing selects White. Its purchase link is paused while the exact finish is verified.
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