Our Verdict
Alen Air Purifier BreatheSmart 45i HEPA with Fresh Filter + Carbon (Product A) Wins

This model delivers significantly superior overall air purification, boasting a remarkable CADR smoke rating of 1216 and effective coverage for up to 1900 sq ft, vastly outperforming Product B's 253.33 CADR and 395.83 sq ft. Furthermore, Product A is available at a slightly lower price of $464.0 compared to Product B's $479.0. Product B is the better pick only if the primary concern is neutralizing exceptionally strong, localized odors in a smaller space, where its dedicated odor filter might offer a slight edge over Product A's more general carbon filtration.
Bottom Line: Alen Air Purifier BreatheSmart 45i HEPA with Fresh Filter + Carbon (Product A) is the better choice. This model delivers significantly superior overall air purification, boasting a remarkable CADR smoke rating of 1216 and effective coverage for up to 1900 sq ft, vastly outperforming Product B's 253.
In-Depth Analysis
How they compare in practice
The Alen BreatheSmart 45i models, while sharing a similar core design, diverge significantly in their filtration specialization and effective coverage, catering to distinct user needs. The Alen Air Purifier BreatheSmart 45i HEPA with Fresh Filter + Carbon (Product A) is clearly engineered for expansive, comprehensive air purification across large areas. Its impressive CADR smoke rating of 1216 and coverage of 1900 sq ft mean it can rapidly clean the air in substantial living spaces, tackling dust, allergens, VOCs, and smoke with considerable efficiency. In real-world use, this translates to faster air changes in open-concept homes or multiple connected rooms, making it a powerhouse for general air quality improvement.
In contrast, the Alen Air Purifier BreatheSmart 45i HEPA with Odor Filter (Product B) shifts its focus to specialized odor neutralization. While its product description mentions
Key Differences
The most significant spec differences at a glance
Cadr Smoke
380% moreCoverage Sq Ft
380% moreAdvantages
Where each product wins
Alen
- Cadr Smoke: 380% higher (1216 vs 253.33)
- Coverage Sq Ft: 380% higher (1900 vs 395.83)
Which to Pick for Your Situation
Concrete scenarios with a clear recommendation
For a large open-concept living area
AlenProduct A covers a vast 1900 sq ft, making it ideal for large, interconnected spaces, significantly more than Product B's 395.83 sq ft.
For neutralizing strong pet odors in a bedroom
AlenProduct B features a specialized Odor Filter designed to neutralize strong household odors, making it more effective for targeted smell removal.
For maximum smoke removal (e.g., wildfires)
AlenProduct A boasts a superior CADR smoke rating of 1216, offering much faster and more effective smoke particle removal compared to Product B's 253.33 CADR.
For an average-sized master bedroom with general air quality concerns
AlenProduct A offers a much higher CADR smoke rating of 1216 and broader coverage (1900 sq ft), providing superior overall air cleaning performance even if the full coverage isn't utilized.
Who Should Buy Which?
Find the right product for your needs
Buy Alen if...
Alen Air Purifier BreatheSmart
The Alen Air Purifier BreatheSmart 45i HEPA with Fresh Filter + Carbon (Product A) is the ideal choice for individuals or families residing in larger homes, apartments with open-concept layouts, or those frequently needing to purify air across multiple connected rooms. Their primary need is robust, comprehensive air cleaning for general airborne pollutants like dust, allergens, pet dander, VOCs, and smoke. They prioritize maximum clean air delivery rate (CADR) and extensive coverage, particularly valuing the unit's ability to purify up to 1900 sq ft effectively. This buyer might live in an area prone to wildfire smoke or simply desires the peace of mind that comes from a high-capacity purifier. They are budget-conscious but still seek premium performance, finding Product A's $464.0 price point reasonable for its superior specifications, including its impressive CADR smoke rating of 1216. While Product A handles odors with its carbon filter, this buyer doesn't typically contend with exceptionally strong, persistent odors that require specialized absorption, thus gladly forgoing Product B's specific odor filter for broader purification power.
Buy Alen if...
Alen Air Purifier BreatheSmart
The Alen Air Purifier BreatheSmart 45i HEPA with Odor Filter (Product B) is perfectly suited for a buyer whose paramount concern is the neutralization of strong, persistent household odors within a more contained space. This individual might have pets, frequently cooks pungent foods, or deals with specific VOCs in a bedroom, home office, or designated pet area. Their priorities revolve around an effective odor-elimination solution over vast coverage. They value Product B's specialized Odor Filter, which excels where general carbon filters might fall short for heavy smells. The effective coverage of 395.83 sq ft and CADR smoke rating of 253.33 are perfectly adequate for their specific, smaller-room application. This buyer appreciates features like the SmartSensor and ultra-quiet operation for a comfortable environment, and they are willing to pay slightly more at $479.0 for this specialized capability. They are not looking to purify an entire floor or combat widespread wildfire smoke, understanding that Product B trades expansive coverage and overall CADR for its targeted odor-fighting prowess, which perfectly aligns with their specific, localized needs.
Spec Comparison
5 specs compared
| Specification | ![]() | ![]() |
|---|---|---|
| Price | $464 | $479 |
| Rating | 4.4(60) | 4.7(754) |
| Cadr Smoke | 1216 | 253.33 |
| Coverage Sq Ft | 1900 | 395.83 |
| Filter Type | HEPA | HEPA Odor Filter |
| Model Number | 45i_V2 | — |
| Smart Sensor | Yes | Yes |
Swipe horizontally to see all columns
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
Alen Air Purifier
- Neutralizes strong household odors
- Medical-grade filter captures 0.1 micron particles
- SmartSensor auto-adjusts fan speed
- High CADR smoke rating (253.33)
- Effective coverage (395 sq ft) less than advertised
- Pink noise feature may not be preferred by all users
- Requires periodic filter replacement
Frequently Asked Questions
Common questions about this comparison
What is the effective coverage area for each Alen 45i purifier?
Product A covers up to 1900 sq ft, while Product B's effective coverage is 395.83 sq ft, despite both sharing the '45i' model designation.
Which Alen 45i model is better for smoke removal?
Product A is significantly better for smoke removal, featuring a CADR smoke rating of 1216, vastly higher than Product B's 253.33 CADR.
Can either of these purifiers handle strong pet odors?
Product B, with its specialized Odor Filter, is specifically designed to neutralize strong household odors like those from pets, offering better absorption than Product A's general carbon filter.
What is the main difference in filter types between the two models?
Product A uses a HEPA with Fresh Filter + Carbon for general particles and VOCs, whereas Product B uses a HEPA Odor Filter specifically enhanced for strong odor neutralization.
Do both Alen BreatheSmart 45i models include a smart sensor?
Yes, both Alen BreatheSmart 45i models come equipped with a Smart Sensor that automatically adjusts fan speed based on detected air quality.
Which product offers better overall value for large spaces?
Product A offers superior value for large spaces due to its extensive 1900 sq ft coverage and CADR of 1216 for a slightly lower price of $464.0.
Explore Other Categories
Popular comparisons across the site
Ask AI
Get instant answers about specs
Get the Deets
Ask our AI assistant
Ask Deets anything!
























