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

Its CADR Smoke 1216 and 1900 sq ft coverage vastly outperform Shark's 66.67 CADR and 104 sq ft. Choose Shark for its 3-in-1 heating/cooling functionality.

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Bottom Line: Alen BreatheSmart 45i is the better choice. Its CADR Smoke 1216 and 1900 sq ft coverage vastly outperform Shark's 66.

Key Differences

The most significant spec differences at a glance

1,216

Cadr Smoke

1724% more

66.67

1,900

Coverage Sq Ft

1724% more

104.17

Advantages

Where each product wins

Alen

Cadr Smoke: 1724% higher (1216.0 vs 66.67)
Coverage Sq Ft: 1724% higher (1900.0 vs 104.17)

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 prioritizing robust, large-area air purification above all else. They likely live in a home with open layouts, large bedrooms, or high dust/allergen concerns, needing to cover up to 1900 sq ft. They value the 1216 CADR for rapid cleaning and the SmartSensor for automatic adjustments. A quiet operation with pink noise for sleep is a bonus. Budget allows for a premium air purifier, valuing pure performance over multi-functionality.

Buy Shark if...

Shark HC451 3-in-1 Clean

The Shark HC451 is perfect for individuals in small spaces like dorm rooms, small bedrooms, or home offices (up to 104 sq ft) who need a multi-functional device. This buyer prioritizes saving space and desires combined air purification, heating, and fan cooling from one unit. They appreciate its quiet operation and dimmable lights for sleep. While not needing high CADR (66.67), they value the versatility and convenience of a 3-in-1 appliance despite periodic filter replacement costs and a slightly higher price point.

Spec Comparison

5 specs compared

Specification	Alen Air Purifier BreatheSmart	Shark HC451 3-in-1 Clean
Price	$313	$310
Rating	4.7(754)	4.3(355)
Cadr Smoke	1216	66.67
Coverage Sq Ft	1900	104.17
Filter Type	HEPA	Nanoseal HEPA
Smart Sensor	Yes	Yes
Model Number	—	HC451

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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

Shark HC451 3-in-1

Pros

Purifies air, heats rooms, and provides fan cooling.
Nanoseal filter captures 99.98% of airborne particles.
Clean Sense IQ auto-adjusts purification power.
Operates quietly with dimmable lights for sleep.

Cons

Effective purification covers only 104 sq ft.
Low CADR of 67 for smoke limits purification speed.
Requires periodic filter replacements, adds cost.

Frequently Asked Questions

Common questions about this comparison

Which air purifier is better for a large room?

The Alen BreatheSmart 45i is ideal for large rooms, covering up to 1900 sq ft. The Shark HC451 is designed for much smaller spaces, purifying only 104 sq ft, making it suitable for a small bedroom or office.

What's the main difference in air purification speed?

The Alen BreatheSmart 45i offers significantly faster purification with a CADR Smoke of 1216. The Shark HC451 has a CADR Smoke of 66.67, which is slower but adequate for its intended smaller coverage area.

Is the price difference worth it?

The Alen is slightly cheaper and offers vastly superior purification power and coverage. The Shark's higher price includes heating and fan functions, offering more versatility despite lower purification specs, making it a different value proposition.

Which offers more functionality beyond air purification?

The Shark HC451 is a 3-in-1 device that purifies air, heats rooms, and provides fan cooling. The Alen BreatheSmart 45i is a dedicated air purifier, focused solely on high-performance air cleaning.