Air purifier · large-room
Alen BreatheSmart 75i
A powerful large-room HEPA H13 purifier with swappable filter options and AHAM-verified CADR, but it carries a defeatable ionizer.
Total cost of ownership
- Annual filters
- $99/yr
- Device
- $799
- 5-year total
- $1294
Certifications
- ANSI/AHAM AC-1smoke, dust, pollen
Overview
The Alen BreatheSmart 75i is a large-room air purifier built around a H13 filter. Its Clean Air Delivery Rate is AHAM-verified at 351 cfm, and it uses a defeatable ionizer (can be switched off). Filters run about $99 per year, a typical running cost.
By the numbers
- Clean Air Delivery Rate
- 351 cfm (AHAM-verified)
- Real coverage at 4.8 ACH
- ~544 sq ft
- Manufacturer room claim
- 448 sq ft
- Filter
- H13
- Ozone / ionizer
- a defeatable ionizer (can be switched off)
- Noise (low)
- 37 dBA, 45 dBA sleep
- Power draw
- 47 W
- Annual filter cost
- $99/yr
- 5-year cost of ownership
- $1294 (device + filters)
- Certifications
- ANSI/AHAM AC-1
Strengths
- + Practical Fit: 8.0/10
Watch-outs
- - Certification: 3.0/10
- - Safety: 0.0/10
Who it is for
- · Large living rooms and open-plan spaces
What to know before buying
- · The 75i is offered with several interchangeable HEPA filter options (Pure, Fresh, and Odor), so the filter you buy depends on your target pollutants.
- · Alen rates filter life at roughly 12 to 15 months under continuous use, with replacement filters priced about $99 to $139 each.
- · Alen's lifetime guarantee on the 75i is conditional: it requires product registration and an active filter subscription to remain valid.
How it scored
Verified Performance
7.0/10 · 30%AHAM CADR, true sealed HEPA, air changes per hour, honest room-size match.
- +3AHAM Verifide CADR published A351 cfm (AHAM Verifide) - CADR is third-party verified by AHAM, not a manufacturer claim.
- +2Hits ~5 air changes/hour at rated room B5.9 ACH at 448 sq ft - Delivers at least 4.8 air changes per hour at its rated room size.
- +2Honest room-size claim Brated 448 sq ft, CADR supports 544 - Claimed room size is within what the unit's own CADR can clean.
Total Cost of Ownership
6.0/10 · 25%Computed annual filter cost vs the room-size class median. The number nobody surfaces.
- +5Annual filter cost vs class median A$99.00/yr (below class median) - Computed annual filter cost scored against the room-size class median.
- +1Washable pre-filter Bwashable pre-filter - A washable pre-filter extends main-filter life and lowers running cost.
Certification
3.0/10 · 15%AHAM Verifide, Energy Star, CARB, published lab efficiency.
- +3Published lab-tested efficiency AAHAM-listed CADR - Filtration performance is independently lab-tested and published.
Safety
0.0/10 · 15%Ozone and ionizer behavior. Ozone generators hard-fail.
- ·Defeatable ionizer, not CARB-verified Bionizer, no CARB listing - Ionizer is switchable but lacks a CARB ozone-compliance listing.
Practical Fit
8.0/10 · 15%Noise, filter-change indicator, energy draw. Smart features are neutral.
- +4Quiet at low speed B37 dBA low - Runs at 50 dBA or quieter on its lowest useful speed.
- +2Filter-change indicator Bindicator present - Tells you when the filter actually needs replacing.
- +2Energy draw disclosed B47 W - Discloses power draw at a standard speed.
- ·Smart features (neutral) Capp / auto mode - App control and auto mode are neither rewarded nor penalized.
FAQ
- What is required to keep the lifetime warranty active?
- Alen's Forever Guarantee on the 75i applies only when you register the unit and maintain an active filter subscription. Without those conditions the lifetime coverage does not apply.
- Are there different filters to choose from?
- Yes. The 75i accepts several HEPA variants (Pure, Fresh, Odor) targeting allergens, smoke, or odors, so confirm which version matches your situation before reordering.
Related guides
This score is our opinion under our published rubric, not a statement of objective fact or a lab test of this product. We score what third-party certifications prove; absence of a certification means we found no verification, not that a product fails to perform. Last reviewed 2026-06-01. Scored under air-v1.0. Prices and certifications are re-verified on a cadence; see the methodology for how each rule fires.