Alen Air Purifier vs PuroAir 240 HEPA: Which Should You Buy in 2026?

Name: Alen Air Purifier BreatheSmart 45i HEPA with Pure Filter for Large Rooms up to 1900 Sq. Ft. - Perfect for Bedrooms & Home Offices - Captures Dust -...
Brand: Alen
SKU: B0FPD3RTJQ
Price: 313.06 USD
Availability: InStock
Rating: 4.7 (754 reviews)

Our Verdict

Alen BreatheSmart 45i Wins

Alen Air Purifier BreatheSmart 45i HEPA with Pure Filter for Large Rooms up to 1900 Sq. Ft. - Perfect for Bedrooms & Home Offices - Captures Dust - Graphite - High-End Air Purifiers

It offers significantly superior coverage and purification power, with a CADR of 1216 and coverage up to 1900 sq ft for $313.06, dwarfing PuroAir's 640 CADR and 1000 sq ft per unit. While Alen is a single unit at a higher price, its raw performance for vast spaces is unmatched here. The PuroAir 240 is the better pick for those needing to cover two distinct rooms of up to 1000 sq ft each, leveraging its 2-pack value at $279.99 for two units.

$313Check Price on Amazon

Bottom Line: Alen BreatheSmart 45i is the better choice. It offers significantly superior coverage and purification power, with a CADR of 1216 and coverage up to 1900 sq ft for $313.

In-Depth Analysis

How they compare in practice

The Alen BreatheSmart 45i and PuroAir 240 present distinct value propositions for different home purification needs. The most striking difference lies in their raw performance for a single space. The Alen 45i boasts a remarkable CADR (Smoke) of 1216 and covers an expansive 1900 sq ft, making it a powerhouse for open-concept living areas, large basements, or commercial spaces. In real-world terms, this means the Alen can clean the air in a very large room much faster and more effectively than a single PuroAir unit. Its ability to filter 99.9% of 0.1 micron particles ensures comprehensive removal of even the finest airborne irritants.

Conversely, the PuroAir 240, while less powerful per unit with a 640 CADR and 1000 sq ft coverage, shines through its 2-pack offering at a lower total price. For just $279.99, buyers receive two units capable of individually purifying two separate rooms or providing overlapping coverage in an exceptionally large, multi-zone space. This makes the PuroAir a highly cost-effective solution for multi-room homes or apartments, allowing users to deploy dedicated purification in a bedroom and a living room, for instance. Both units feature smart sensors for automatic fan speed adjustment, offering convenience, though neither explicitly details app control functionality, a modern expectation.

A key trade-off surfaces with specific filtration capabilities. While both utilize HEPA filters, Alen explicitly mentions "pink noise for sleep optimization" and its effectiveness against 0.1 micron particles, suggesting a focus on silent, precise particulate removal. PuroAir highlights its "3-layer filtration" but doesn't explicitly state activated carbon for odor or VOC removal, a common feature in higher-end purifiers. For households dealing with pet odors or specific chemical sensitivities, the lack of explicit activated carbon in both is a consideration, though Alen's lack of VOC filtration mention is a notable omission. Ultimately, Alen targets those with very large single spaces and a premium on rapid, high-volume air turnover, while PuroAir caters to multi-room coverage on a tighter budget with a focus on general particulate removal.

Key Differences

The most significant spec differences at a glance

1,216

Cadr Smoke

90% more

640

1,900

Coverage Sq Ft

90% more

1,000

Advantages

Where each product wins

Alen

Cadr Smoke: 90% higher (1216.0 vs 640.0)
Coverage Sq Ft: 90% higher (1900.0 vs 1000.0)

Which to Pick for Your Situation

Concrete scenarios with a clear recommendation

For an open-plan living room and kitchen (approx. 1500 sq ft)

Alen

The Alen BreatheSmart 45i's 1900 sq ft coverage and 1216 CADR are ideally suited for rapidly purifying such a vast, connected space.

For a two-bedroom apartment, needing purification in the living room and master bedroom

PuroAir

The PuroAir 240 comes as a 2-pack, allowing dedicated purification for two separate 1000 sq ft rooms for a cost-effective price of $279.99.

For maximum air cleaning speed in a single very large room (over 1000 sq ft) with severe allergy concerns

Alen

Alen's superior CADR of 1216 means it can cycle air much faster in a 1900 sq ft room, providing quicker relief from allergens.

For a budget-conscious buyer prioritizing energy efficiency

PuroAir

The PuroAir 240 is Energy Star certified, indicating lower long-term operating costs compared to the Alen, which lacks this certification.

Who Should Buy Which?

Find the right product for your needs

Buy Alen if...

Alen Air Purifier BreatheSmart

The ideal buyer for the Alen BreatheSmart 45i is someone with a single, expansive living space—think an open-concept great room, a large basement, or even a smaller commercial office—who prioritizes rapid and thorough air purification. This individual isn't concerned about covering multiple distinct rooms but rather seeks maximum performance within one vast area. They are likely dealing with significant airborne pollutants, perhaps due to pets, allergies, or living in an area with high particulate matter, and need the fastest possible air turnover. With its remarkable 1216 CADR (Smoke) and ability to cover up to 1900 sq ft, the Alen 45i is unmatched in this comparison for sheer power. They appreciate features like the SmartSensor for set-it-and-forget-it operation and value the "pink noise for sleep optimization" for bedroom placement. While they might forgo explicit activated carbon or app control, their primary need is an uncompromising, high-capacity purifier for a very large space, and they are willing to invest $313.06 for this premium performance.

Buy PuroAir if...

PuroAir 240 HEPA Air

The PuroAir 240 is perfect for the practical, value-conscious consumer who needs effective air purification across multiple distinct living spaces, without necessarily requiring extreme coverage in any single room. This buyer might live in a multi-room apartment, a medium-sized house, or needs to address air quality in two separate areas like a bedroom and a home office. Their budget is important, and the 2-pack offering at $279.99 provides exceptional value, effectively getting two purifiers for less than the price of a single high-end unit. They appreciate features like the Smart Sensor for automatic adjustments and the quiet operation for undisturbed living or sleeping. With a coverage of 1000 sq ft and a CADR (Smoke) of 640 per unit, it's highly effective for standard large rooms. The Energy Star certification is also a significant draw for those mindful of electricity consumption. They are willing to accept slightly less individual power per unit compared to the Alen, in exchange for versatile multi-room coverage and superior overall cost-effectiveness.

Spec Comparison

5 specs compared

Specification	Alen Air Purifier BreatheSmart	PuroAir 240 HEPA Air
Price	$313	$280
Rating	4.7(754)	4.6(16.0k)
Cadr Smoke	1216	640
Coverage Sq Ft	1900	1000
Filter Type	HEPA	HEPA
Smart Sensor	Yes	Yes
Energy Star	—	Yes

Swipe horizontally to see all columns

Pros & Cons

Quick overview of strengths and weaknesses

Alen Air Purifier

Pros

Covers up to 1900 sq ft per hour
Filters 99.9% of 0.1 micron particles
SmartSensor adjusts fan speed automatically
Generates pink noise for sleep optimization

Cons

No stated activated carbon for odor removal
Remote app control functionality not specified
Does not specify VOC filtration capability

PuroAir 240 HEPA

Pros

Covers 1,000 sq ft area rapidly.
High CADR of 640 for effective smoke removal.
3-layer filtration removes 99.9% of pollutants.
Smart sensor automatically adjusts fan speed.

Cons

Requires ongoing cost for filter replacements.
Specific noise output (dB) not detailed.
Lacks remote or smartphone app control.

Frequently Asked Questions

Common questions about this comparison

What is the maximum coverage area for each air purifier?

The Alen BreatheSmart 45i covers up to 1900 sq ft. The PuroAir 240 covers up to 1000 sq ft per unit, meaning the 2-pack can cover two separate 1000 sq ft spaces.

Which purifier is better for smoke removal?

The Alen BreatheSmart 45i has a significantly higher CADR (Smoke) of 1216.0, making it more effective and faster at removing smoke from larger areas compared to PuroAir's 640.0 CADR.

Do these purifiers have smart features?

Both the Alen BreatheSmart 45i and PuroAir 240 include Smart Sensors that automatically adjust fan speed based on detected air quality. Neither explicitly specifies smartphone app control.

Is there a difference in price for multiple units?

Yes, the PuroAir 240 is sold as a 2-pack for $279.99, offering two units. The Alen BreatheSmart 45i is a single unit priced at $313.06.

Are these purifiers loud?

Both products are described as having quiet operation. The Alen 45i specifically mentions generating "pink noise for sleep optimization," implying a focus on low disturbance.

Do either of these filters remove odors or VOCs?

Neither product explicitly states activated carbon filtration for odor or VOC removal. Both primarily focus on HEPA filtration for particulate matter like dust, pollen, and smoke.