Our Verdict
Alen Alen Air Purifier BreatheSmart 45i Wins
It offers superior smoke CADR (1216 vs 416) and covers much larger rooms (1900 sq ft vs 650 sq ft). Choose Coway if you prioritize a 5-year warranty and a specific low noise level (22 dB).
Spec Comparison
8 specs compared
| Specification |  |  |
|---|---|---|
| Price | $464 | $490 |
| Rating | 4.4(60) | 4.4(6.5k) |
| Cadr Smoke | 1216 | 416 |
| Coverage Sq Ft | 1900 | 650 |
| Noise Level db Min | — | 22 dB |
| Filter Type | HEPA | True HEPA |
| Model Number | 45i_V2 | — |
| Smart Sensor | Yes | Yes |
| Weight | — | 3.05 lbs |
| Energy Star | — | Yes |
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Pros & Cons
Quick overview of strengths and weaknesses
Alen Air Purifier
- Covers up to 1900 sq ft hourly
- Captures particles down to 0.1 micron
- Filters VOCs, odors, chemicals
- Quiet operation promotes sleep
- Limited absorption for heavy odors/chemicals
- Requires periodic filter replacement
Coway Air Purifiers
- Removes 99.999% of 0.01-micron particles.
- Covers 780 sq ft with 4 air changes per hour.
- Smart Mode adjusts fan speed based on air quality.
- Eco Mode shuts off fan when air is clean.
- Stated 3,120 sq ft coverage misleading for 4 ACH.
- True HEPA filters require periodic replacement.
- No remote control listed in features.
Frequently Asked Questions
Common questions about this comparison
Which air purifier is better suited for very large rooms or open-plan areas?
The Alen BreatheSmart 45i excels in very large spaces, covering up to 1900 sq ft. The Coway Airmega 400(G) is designed for rooms up to 650 sq ft (for 4 air changes per hour), making it suitable for large rooms but not as extensive as Alen.
What is the main difference in their ability to remove smoke?
The Alen BreatheSmart 45i has a significantly higher smoke CADR of 1216, offering superior smoke removal for things like wildfire or cigarette smoke. The Coway Airmega 400(G) has a smoke CADR of 416.0, which is effective but less powerful for heavy smoke.
Which air purifier offers a quieter operation?
The Coway Airmega 400(G) specifies a minimum noise level of 22 dB, making it a quantifiable quiet option. While the Alen BreatheSmart 45i promotes quiet operation for sleep, a specific decibel measurement is not provided in its specifications.
Does either product offer a better warranty?
Yes, the Coway Airmega 400(G) stands out with a 5-year limited warranty, providing extended assurance. The warranty information for the Alen BreatheSmart 45i is not detailed in the provided specifications.
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