#8Alen BreatheSmart 45i

Product Review · Air Purifiers · #8 Ranked

Alen BreatheSmart 45i

Lifetime-warranty premium, 24 dB · Reviewed by Katie · amazon.com live, Sept 9 2026

79
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Worth It
Rank #8 of 10 · Air Purifiers
$449.00
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The verdict

Why it scored a 79

At $449.00 the Alen BreatheSmart 45i is a premium tower purifier rated for 800 sq ft with a medical-grade HEPA filter rated to 0.1 micron. Warranty leads at 100 and Quality at 88: it runs at 24 dB on low, uses an optical sensor for auto mode, and carries a lifetime warranty. Value drags at 60 because that lifetime cover is conditional on staying enrolled in filter auto-ship (2 years standard otherwise), the ~$79 Essential filter is pricier than most rivals, and this listing sells through Amazon Resale with only 31 ratings. It is for a large living room where silence and a long warranty outweigh sticker price.

Key specs

What you're getting

  • Medical-grade HEPA rated to capture 0.1 micron particles
  • Rated for 800 sq ft at 2 air changes per hour
  • 24 dB on low, among the quietest 20% of purifiers
  • Optical particle sensor, auto mode, color air-quality ring
  • Essential filter ~$79, lasts 9-12 months
  • Lifetime warranty only with filter auto-ship enrolled; 2 years standard
  • This ASIN sells via Amazon Resale; check for an Alen-sold variant

ViperScore breakdown

FactorScoreWeightPoints
Value60×25%15.0
Quality88×20%17.6
Features84×15%12.6
Reliability77×15%11.6
Satisfaction84×15%12.6
Warranty100×10%10.0
Weighted total79

At a glance

  • Medical-grade HEPA to 0.1 micron; 800 sq ft at 2 ACH
  • 24 dB on low; optical sensor and auto mode
  • Essential filter ~$79 per 9–12 months; lifetime warranty*
  • Price$449.00
  • TierLifetime-warranty premium, 24 dB
  • Category rank#8 of 10
Katie
Katie
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