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.
Bottom line
In our scoring the Alen BreatheSmart 75i earns 6.3/10, a weak result, and it stands out on practical fit (8.0/10). On the data, its 351 cfm CADR is AHAM-verified. Filters run about $99 a year (~$1294 over five years with the device), a typical running cost. Its weakest area in our scoring is certification (5.0/10).
Where to buy
No buy link on this one: it scored Limited under our rubric, and we only link products we would shortlist ourselves.
Total cost of ownership
Checked 42 days ago- Annual filters
- $99/yr
- Device
- $799
- 5-year total
- $1294
Certifications
- ANSI/AHAM AC-1smoke, dust, pollen
- CARB ozone complianceozone
Filters only protect you on their swap schedule. Get an email reminder when this one is due - one note around swap time, nothing else.
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, CARB ozone compliance
Strengths
- + Practical Fit: 8.0/10
Watch-outs
- No significant weaknesses flagged.
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
5.0/10 · 15%AHAM Verifide, Energy Star, CARB, published lab efficiency.
- +2CARB certified ACARB compliant - Meets California's air-cleaning-device ozone-emission rules.
- +3Published lab-tested efficiency AAHAM-listed CADR - Filtration performance is independently lab-tested and published.
Safety
5.0/10 · 15%Ozone and ionizer behavior. Ozone generators hard-fail.
- +5Ionizer is CARB-certified and defeatable ACARB ionizer, switchable - Ionizer can be turned off and meets CARB ozone limits.
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
- Is the Alen BreatheSmart 75i's CADR AHAM-verified, and does it emit ozone?
- Its 351 cfm Clean Air Delivery Rate is AHAM-verified - independently tested, not a box claim. It has a defeatable ionizer, CARB-certified for low ozone.
- 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.
Compared head-to-head
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 2026-06-06. Scored under air-v1.0. Prices were last checked 42 days ago; the freshness chip above the cost panel shows the current state. See the methodology for how each rule fires.