How large a room can the 75i clean?

Alen rates it for 2,800 sq ft with one air change per hour, or 1,400 sq ft with two changes per hour. That suits large living areas and open-plan spaces.

Is it quiet enough for a bedroom?

Yes. It runs at 25 dBA on the lowest speed, which is close to silent. The highest speed reaches 51 dBA, so most people sleep with it on a lower setting.

What does the app do?

The Alen Air app shows air quality readings and lets you control the purifier remotely. The onboard sensors track PM2.5, TVOC, eCO2, temperature and humidity.

What filter does it use?

It ships with the 75i True HEPA filter, which Alen says captures 99.9% of particles above 0.1 micron. Replacements are sold separately.

What comes in the box?

The purifier, a 75i True HEPA filter, an optional designer panel, a quick start guide, a user manual and a power adapter.

How does it compare with smaller Alen models?

The 75i covers much larger rooms than Alen's smaller units and adds the full sensor suite and app control. It is the better pick for open living spaces; smaller models suit bedrooms and offices.

Where is the Alen BreatheSmart 75i Air Purifier cheapest?

At Ace Air Purifiers, for $788.00, as of our latest check.

What do buyers say about the Alen BreatheSmart 75i Air Purifier?

Buyers like: Quiet operation, easy to sleep with; Effective at removing cooking and pet odors; Noticeable improvement in air quality and allergies.

Where can I buy the Alen BreatheSmart 75i Air Purifier?

6 stores we checked sell it, including ALEN, Ace Air Purifiers, Amazon, Home Depot, Alen.

Alen BreatheSmart 75i Air Purifier Price History: Lowest $788.00

What reviewers say

Owners consistently call the 75i quiet enough to sleep next to and effective against cooking, pet and wildfire smoke odors. Many report fewer allergy symptoms and praise the solid build, with one owner still running an Alen unit after 10 years.

What people mention

NoisePraisedOwners say low speed is nearly silent and easy to sleep with, though high speed is loud.
Odor removalPraisedReviewers report it clears cooking and pet odors effectively.
AllergiesPraisedBuyers describe fewer allergy symptoms and fresher indoor air.
Build qualityPraisedOwners call it well built and durable, with one unit lasting 10 years.
Wildfire smokePraisedReviewers say it kept indoor air fresh during wildfire smoke.
Filter costCriticisedReplacement HEPA filters are a recurring expense owners note.

From ALEN

Medical-grade HEPA filtration removes 99.9% of particles greater than 0.1 micron
Covers up to 2,800 sq ft every hour or 1,400 sq ft every 30 minutes
Quiet operation: 25 dBA on lowest speed, 51 dBA on highest
Smart sensors track PM2.5, TVOC, eCO2, temperature and humidity
Alen Air app lets you monitor air quality and control the purifier remotely
Color-coded ring gives real-time feedback on air quality

Materials: Medical-grade H13 True HEPA filter material
Care: Remove the clear plastic seal from the filter before use
Guarantee: Lifetime Warranty / Forever Guarantee with product registration and an active Alen air filter subscription
Returns: 60-Day Trial
Shipping: Free 2-Day Shipping
Packs: Air Purifier Only (system plus 1 filter) or Air Purifier plus Filter Subscription
In the box: BreatheSmart 75i air purifier, 75i True HEPA air filter, Designer panel (optional), Quick start guide, User manual, Power adapter

About the Alen BreatheSmart 75i Air Purifier

The Alen BreatheSmart 75i is an air purifier with a medical-grade H13 True HEPA filter. The filter removes 99.9% of particles greater than 0.1 micron. It covers up to 2,800 sq ft every hour, or 1,400 sq ft every 30 minutes.

Smart sensors track PM2.5, TVOC, eCO2, temperature and humidity. A color-coded ring gives real-time feedback on air quality. The Alen Air app lets you monitor air quality and control the purifier remotely.

It runs at 25 dBA on the lowest speed and 51 dBA on the highest. Remove the clear plastic seal from the filter before use.

Filter: Medical-grade H13 True HEPA
Filtration: 99.9% of particles greater than 0.1 micron
Coverage: Up to 2,800 sq ft every hour; 1,400 sq ft every 30 minutes
Noise level: 25 dBA lowest speed, 51 dBA highest speed
Sensors: PM2.5, TVOC, eCO2, temperature, humidity
Air quality display: Color-coded ring
App: Alen Air app for monitoring and remote control
Function: Air purification
Care: Remove the clear plastic seal from the filter before use
In the box: BreatheSmart 75i air purifier, 75i True HEPA air filter, designer panel (optional), quick start guide, user manual, power adapter