Name: Alen Air Purifier BreatheSmart 45i HEPA with Odor Filter for Large Rooms up to 1900 Sq. Ft. - Perfect for Bedrooms & Home Offices - Captures Dust -...
Brand: Alen
SKU: B0FPCVBMLJ
Price: 479 USD
Availability: InStock
Rating: 4.7 (754 reviews)

Our Verdict

Coway Airmega 400 Wins

Coway AP-2015F Airmega 400 Smart Air Purifier (Covers 1,560 sq. ft.), True HEPA Air Purifier with Smart Technology, White 400 WHITE - High-End Air Purifiers

It offers superior coverage at 1560 sq ft and a higher CADR smoke of 328.0. Choose Alen BreatheSmart 45i for ultra-quiet operation in smaller bedrooms, despite its lower effective coverage of 395.83 sq ft.

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Bottom Line: Coway Airmega 400 is the better choice. It offers superior coverage at 1560 sq ft and a higher CADR smoke of 328.

Key Differences

The most significant spec differences at a glance

253.33

Cadr Smoke

23% less

328

395.83

Coverage Sq Ft

75% less

1,560

Advantages

Where each product wins

Coway

Cadr Smoke: 23% higher (253.33 vs 328.0)
Coverage Sq Ft: 75% higher (395.83 vs 1560.0)

Who Should Buy Which?

Find the right product for your needs

Buy Alen if...

Alen Air Purifier BreatheSmart

If you live in a smaller home or apartment, or need an air purifier specifically for a bedroom or home office (up to ~400 sq ft), the Alen BreatheSmart 45i is ideal. Its ultra-quiet operation and SmartSensor are perfect for light sleepers or those easily disturbed by noise, making it suitable for peaceful environments. It excels at neutralizing strong odors and capturing fine particles with its medical-grade HEPA filter. While slightly pricier than Coway, its focus on quiet performance and odor elimination in personal spaces justifies the cost for specific users.

Buy Coway if...

Coway AP-2015F Airmega 400

The Coway Airmega 400 is perfect for those with large open-concept living areas, covering up to 1560 sq ft with its high CADR smoke of 328.0. If you prioritize comprehensive air purification across substantial spaces and value energy efficiency (Energy Star certified), this is your top choice. It effectively tackles dust, allergens, VOCs, and odors. Priced affordably at $349, it offers superior coverage and robust filtration, making it an excellent investment for whole-home air quality management, even with its 24.7 lbs weight.

Spec Comparison

8 specs compared

Specification	Alen Air Purifier BreatheSmart	Coway AP-2015F Airmega 400
Price	$479	$349
Rating	4.7(754)	4.4(6.5k)
Cadr Smoke	253.33	328
Coverage Sq Ft	395.83	1560
Noise Level db Min	—	22 dB
Filter Type	HEPA Odor Filter	True HEPA
Smart Sensor	Yes	Yes
Weight	—	24.7 lbs
Energy Star	—	Yes
Noise Level db Max	—	52 dB

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Pros & Cons

Quick overview of strengths and weaknesses

Alen Air Purifier

Pros

Neutralizes strong household odors
Medical-grade filter captures 0.1 micron particles
SmartSensor auto-adjusts fan speed
High CADR smoke rating (253.33)

Cons

Effective coverage (395 sq ft) less than advertised
Pink noise feature may not be preferred by all users
Requires periodic filter replacement

Coway AP-2015F Airmega

Pros

Covers 1,560 sq. ft. in 30 minutes.
Filters 99.999% of 0.01-micron airborne particles.
Reduces 99% of VOCs and odors effectively.
Automatically adjusts fan speed to optimize air quality.

Cons

Maximum noise level reaches 52 dB.
Requires periodic filter replacement and cleaning.
Unit weighs 24.7 lbs.

Frequently Asked Questions

Common questions about this comparison

Which is better for large rooms?

Coway Airmega 400 is better, covering up to 1560 sq ft. The Alen BreatheSmart 45i's effective coverage is only 395.83 sq ft, despite its advertised larger range, making Coway superior for expansive spaces.

What's the main difference in air purification performance?

The Coway Airmega 400 has a higher CADR smoke rating of 328.0 and filters 99.999% of 0.01-micron particles. The Alen 45i has a CADR smoke of 253.33 and captures 0.1 micron particles, making Coway more robust.

Is the price difference worth it?

Yes, the Coway Airmega 400, priced lower at $349, offers significantly greater coverage (1560 sq ft) and a higher CADR smoke rating than the $383.2 Alen, which only covers 395.83 sq ft effectively.

Which unit is quieter?

The Alen BreatheSmart 45i is known for its ultra-quiet operation, aiding sleep. The Coway Airmega 400 has a minimum noise level of 22 dB, which is also very low, but the Alen is specifically highlighted for quietness.