Our Verdict
Alen BreatheSmart 45i Wins

It offers significantly higher CADR smoke (1216 vs 99.2) and covers 1900 sq ft, far exceeding LG's 155 sq ft. Choose LG for smaller rooms where Wi-Fi control is a priority.
Bottom Line: Alen BreatheSmart 45i is the better choice. It offers significantly higher CADR smoke (1216 vs 99.
Key Differences
The most significant spec differences at a glance
Cadr Smoke
1126% moreCoverage Sq Ft
1126% moreAdvantages
Where each product wins
Alen
- Cadr Smoke: 1126% higher (1216 vs 99.2)
- Coverage Sq Ft: 1126% higher (1900 vs 155)
Who Should Buy Which?
Find the right product for your needs
Buy Alen if...
Alen Air Purifier BreatheSmart
This purifier is ideal for homeowners or renters with large living spaces, open-concept floor plans, or multiple rooms up to 1900 sq ft. If you prioritize rapid and extensive air purification for dust, allergens, VOCs, wildfire, or cigarette smoke (CADR smoke 1216), and value quiet operation for bedrooms, the Alen 45i is your choice. Its smart sensor automatically adjusts to maintain air quality, making it a powerful, set-and-forget solution for comprehensive home air cleaning, even with a slightly higher initial cost.
Buy LG if...
LG PuriCare AeroTower Air
The LG PuriCare AeroTower is perfect for individuals seeking a stylish, multi-functional unit for smaller, defined spaces like bedrooms, home offices, or small apartments (up to 155 sq ft). If you value modern aesthetics, smart home integration via Wi-Fi for remote control, precise air quality monitoring with a PM 1.0 sensor, and multiple airflow options, this is your pick. It offers effective general air filtration for everyday pollutants at a slightly lower price point, prioritizing design and smart features over raw purification power for vast areas.
Spec Comparison
6 specs compared
| Specification | ![]() | ![]() |
|---|---|---|
| Price | $464 | $450 |
| Rating | 4.4(60) | 4.2(14) |
| Cadr Smoke | 1216 | 99.2 |
| Coverage Sq Ft | 1900 | 155 |
| Filter Type | HEPA | True HEPA |
| Model Number | 45i_V2 | — |
| Smart Sensor | Yes | Yes |
| WiFi | — | 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
LG PuriCare AeroTower
- 99.97% particle capture for 0.3μm.
- Three-layer filtration system cleans various pollutants.
- PM 1.0 sensor monitors microscopic particles.
- Cleans 155 sq ft rooms 4.8 times hourly.
- 744 sq ft coverage results in very slow air changes.
- Requires periodic filter replacement, incurring cost.
- Smoke CADR of 99.2 CFM limits rapid purification.
Frequently Asked Questions
Common questions about this comparison
Which air purifier is better for large rooms?
The Alen BreatheSmart 45i is vastly superior for large spaces, covering up to 1900 sq ft hourly. The LG PuriCare AeroTower is only effective for much smaller rooms, around 155 sq ft, making Alen the clear choice for expansive areas.
What's the main difference in smoke purification capability?
The Alen 45i has a Smoke CADR of 1216, indicating rapid smoke removal from large areas. The LG AeroTower has a CADR of 99.2, making it suitable only for very small rooms or lighter smoke conditions.
Is the price difference justified between the two?
Yes, despite a small price difference ($14), the Alen offers vastly superior performance, covering 1900 sq ft compared to LG's 155 sq ft, and a much higher CADR. Alen provides significantly more value for large-scale purification.
Which unit has better smart features?
Both have smart sensors. Alen auto-adjusts fan speed. LG adds Wi-Fi for remote operation and a PM 1.0 sensor for microscopic particle monitoring, offering more advanced connectivity and air quality insights.
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!




























