The catch
Levoit Core 400S-P
Washing the combined filter is not allowed.
Side by side
Levoit Core 400S-P vs Coway Airmega 300: Coway’s bigger room label rests on fewer air changes per hour
Quick verdict
For app schedules and a compact, lighter cabinet in a room within its 358 sq ft rating at 4.8 ACH, the Core 400S-P is the choice. For separate washable prefilters and local controls, take the Airmega 300. Its 628 sq ft rating is based on 4 ACH, so check the airflow target before reading the larger number as a direct comparison.
Before you buy
Why, and what it costs you
The room labels refer to different workloads
Converted proportionally, Coway's 628 sq ft at 4 ACH is about 523 sq ft at 4.8 ACH. A 500 sq ft room makes Coway worth checking, and it is over Levoit's stated 358 sq ft limit.
Where this comes from
628 × 4 ÷ 4.8 = 523.3 sq ft, keeping the assumptions behind Coway's label unchanged. It explains the label and is not a new certified room rating.
The catch
Coway Airmega 300
This exact 300 model has neither an app nor a recurring scheduler.
Levoit Core 400S-P
- Why pick it
- VeSync lets you set recurring schedules and control the purifier
- You need a 10.8-inch-wide cabinet and an 11 lb unit to carry
- The catch
- Washing the combined filter is not allowed.
Coway Airmega 300
- Why pick it
- You'd rather wash separate prefilters than dry-clean an integrated outer layer
- The larger room label is worth considering once its lower 4 ACH basis is accounted for
- The catch
- This exact 300 model has neither an app nor a recurring scheduler.
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What this page compares
Room-size assumptions, app scheduling, washable prefilters and the cabinet space needed beside furniture are what set the Core 400S-P and Airmega 300 apart.
For app schedules and a compact, lighter cabinet in a room within its 358 sq ft rating at 4.8 ACH, the Core 400S-P is the choice. For separate washable prefilters and local controls, take the Airmega 300. Its 628 sq ft rating is based on 4 ACH, so check the airflow target before reading the larger number as a direct comparison.
Which one fits
Pick the situations that sound like you
You can't do without remote start and recurring schedules
VeSync schedules work on Core 400S-P. The exact Airmega 300 has neither an app nor a scheduler.
- Levoit Core 400S-P
- Good
- Coway Airmega 300
- Not suitable
The cabinet's width must stay below 12 inches
Levoit's width is 10.8 inches and Coway's 13.6. That checks cabinet width alone, so leave ventilation clearance as well.
- Levoit Core 400S-P
- Good
- Coway Airmega 300
- Not suitable
Separate washable prefilters are a necessity
Coway supplies separate washable prefilters, but Levoit's combined filter must not be washed.
- Levoit Core 400S-P
- Not suitable
- Coway Airmega 300
- Good
A 500 sq ft room aiming for approximately 4.8 ACH
500 is over Levoit's 358 sq ft rating. Coway's 4 ACH label converts to about 523 sq ft, but confirm the actual pollutant CADR, the ceiling height and the fan setting you can use.
- Levoit Core 400S-P
- Not suitable
- Coway Airmega 300
- Depends
A 300 sq ft room run with local automatic controls
Local Auto controls come with both, and their published room labels accommodate this area under the stated assumptions. The fan speed you choose still affects airflow.
- Levoit Core 400S-P
- Good
- Coway Airmega 300
- Good
App schedules and washable separate prefilters are both non-negotiable
Each is missing one required feature. Switching models makes more sense than relaxing an essential requirement.
- Levoit Core 400S-P
- Not suitable
- Coway Airmega 300
- Not suitable
In practice
Differences you will notice
The room labels refer to different workloads
Converted proportionally, Coway's 628 sq ft at 4 ACH is about 523 sq ft at 4.8 ACH. A 500 sq ft room makes Coway worth checking, and it is over Levoit's stated 358 sq ft limit.
How we worked this out
628 × 4 ÷ 4.8 = 523.3 sq ft, keeping the assumptions behind Coway's label unchanged. It explains the label and is not a new certified room rating.
Core 400S-P takes up much less cabinet area
The shell takes up about 37% less floor area and weighs 10.4 lb less. That counts when the purifier has to move between rooms, though the airflow you require and intake clearance still come first.
How we worked this out
10.8 × 10.8 = 116.64 sq in, and 13.6 × 13.6 = 184.96 sq in. That is a 36.9% reduction. 21.4 - 11 = 10.4 lb.
Which controls you get depends on the maintenance preference
Nobody who requires both washable separate prefilters and remote schedules can get both from this pair. Core 400S-P supplies the connected controls and this Airmega 300 supplies the washable prefilters.
How we worked this out
Levoit documents VeSync schedules and dry cleaning for its combined filter. Coway specifies washable prefilters, with Mobile App No and Scheduler No. Airmega 300S is a different model.
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.
Levoit Core 400S-P
Works with your numbers231 CFM of verified clean-air delivery works out to about 5.8 air changes per hour in this room. Hitting the 5 ACH target takes 200 CFM.
Coway Airmega 300
Works with your numbers285 CFM of verified clean-air delivery works out to about 7.1 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
Levoit, LAP-C401S-WUS
Core 400S-P
Small and responsive, this smart purifier moves enough air for a medium room and has one of the better apps in the category.
- Best for
- VeSync lets you set recurring schedules and control the purifier
Facts we checked
- Published room rating: 358 sq ft at 4.8 ACH
- Published CADR basis: 231 CFM generic CADR
- Remote scheduling: VeSync app and schedules
- Cabinet base: 10.8 × 10.8 in
Option B
Coway, AP-1515H
Airmega 300
This two-sided living-room purifier has washable prefilters and automatic fan control, and it needs no app setup.
- Best for
- You'd rather wash separate prefilters than dry-clean an integrated outer layer
Facts we checked
- Published room rating: 628 sq ft at 4 ACH
- Published CADR basis: 285 smoke, 306 dust, 339 pollen CFM
- Remote scheduling: No app or scheduler on the 300
- Cabinet base: 13.6 × 13.6 in
Spec by spec
Where they really differ
| Spec | Levoit Core 400S-P | Coway Airmega 300 | In practice |
|---|---|---|---|
| Published room rating | 358 sq ft at 4.8 ACH | 628 sq ft at 4 ACH | Different circulation rates sit behind the areas, so don't compare the two numbers by themselves. |
| Published CADR basis | 231 CFM generic CADR | 285 smoke, 306 dust, 339 pollen CFM | Nobody should quietly relabel the generic Levoit figure as a pollutant-specific test. |
| Remote scheduling | VeSync app and schedules | No app or scheduler on the 300 | A countdown timer on the unit is not a recurring app schedule. |
| Cabinet base | 10.8 × 10.8 in | 13.6 × 13.6 in | Intake clearance comes on top of the dimensions of the plastic cabinet. |
| Published weight | 11 lb | 21.4 lb | Practical handling also depends on grip, stairs and how far you carry it. |
| Prefilter maintenance | Brush or vacuum the outer prefilter, do not wash the combined filter | Separate washable prefilters and replaceable Max2 filters | Main-filter replacement is still needed under either arrangement. |
Trade-offs
What each pick costs you
With Levoit Core 400S-P
- A larger room can be ruled out by its 358 sq ft label at 4.8 ACH.
With Coway Airmega 300
- More floor space and side access are needed for the 21.4 lb cabinet.
Change of plan
When the answer changes
You need remote schedules
Go with Levoit Core 400S-P. Within this exact pair, connected scheduling belongs to Core 400S-P alone.
You need separate washable prefilters
Go with Coway Airmega 300. This maintenance arrangement is documented for the Airmega 300.
Decision guide
How to decide
Pick the Core 400S-P for app schedules and a compact, lighter cabinet in a room within its 358 sq ft rating at 4.8 ACH. Pick the Airmega 300 for separate washable prefilters and local controls. Its 628 sq ft rating rests on 4 ACH, so check the airflow target before comparing the larger number directly.
Begin with your real room
Measure the enclosed area and the ceiling height, and include an open adjoining space where that applies. The two room labels rest on different air-change rates. A proportional conversion helps explain the gap, whereas the fit calculator works from pollutant-specific CADR, your ceiling height and a 5 ACH target. These are separately labeled methods and are not interchangeable certification results.
Ask whether the purifier will be moved
The Core 400S-P takes less cabinet space and weighs 11 lb, while the Airmega 300 at 21.4 lb is more likely to stay in one place. Check intake clearance before picking the smaller body for a tight corner, because a shell that fits against furniture can still have restricted airflow.
Pick an upkeep routine you'll follow
You can remove and wash the Coway prefilters, and separate indicators cover washing and filter replacement. Levoit's outer prefilter needs a brush or vacuum. Price the correct replacement filter or set for each model. Without actual filter prices, usage and replacement intervals, neither routine supports a promise of lower lifetime cost.
What this page can’t tell you
- A proportional explanation of Coway's room label is all the 523 sq ft figure is. It is not a replacement manufacturer certification or a calculator result.
- Testing for airflow at matched noise, electricity use, cleaning or health outcomes was not performed. Published maximum capacity isn't promised in Sleep or every Auto setting.
By the numbers
What the data shows
What we found across the air purifiers we compare, plus the checked facts behind each finding.
Show the facts and the math
| Product | Needs it meets | Facts we checked | Sources |
|---|---|---|---|
| Levoit Core 400S-P |
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| |
| Coway Airmega 300 |
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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.
Levoit Core 400S-P
VeSync lets you set recurring schedules and control the purifier
See price & reviews on AmazonCoway Airmega 300
You'd rather wash separate prefilters than dry-clean an integrated outer layer
See price & reviews on AmazonEach link opens in a new tab.
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