Which version should I choose?

Pick Essential for dust, pollen, viruses and general allergens. Choose Advanced if you have asthma triggers, smoke, VOCs or chemical odors. Choose Ultimate for mold, pet odors or a home that needs odor control.

Does it fit other Alen purifiers?

No. It is made for the BreatheSmart 45i and FLEX only. Check your purifier's model before ordering.

What does 99.9% at 0.1 micron mean?

Alen rates the HEPA media to capture 99.9% of particles 0.1 micron and larger, which covers dust, pollen, smoke particles and many airborne viruses.

How often should I replace it?

Alen's purifiers signal when the filter needs changing, typically after several months of regular use. Replace sooner in smoky or pet-heavy homes.

Is the Advanced worth it over the Essential?

Yes if odors, smoke or chemical fumes are your concern, because the carbon layer targets gases that HEPA alone does not. For dust and pollen only, Essential covers it.

One replacement filter cartridge for the BreatheSmart 45i or FLEX, in the filtration level you select.

Where is the Alen BreatheSmart 45i FLEX HEPA Filter cheapest?

At ALEN, for $99.00, as of our latest check.

What do buyers say about the Alen BreatheSmart 45i FLEX HEPA Filter?

Buyers like: Powerful air purification; Noticeable improvement in air quality; High quality of the filters.

Alen BreatheSmart 45i FLEX HEPA Filter Price History: Lowest $99.00

What reviewers say

Owners of the BreatheSmart 45i and FLEX praise the filters for powerful purification and a noticeable improvement in air quality, and call them high quality. Complaints center on replacement cost and on the filters fitting only these two purifier models.

What people mention

Air qualityPraisedOwners say the air in the room feels noticeably cleaner after fitting a new filter.
Filtration powerPraisedBuyers describe the purification as powerful and effective.
Build qualityPraisedReviewers call the filters high quality.
Replacement costCriticisedSome owners find the recurring cost of new filters a drawback.
CompatibilityMixedThe filter works well, but only in the BreatheSmart 45i and FLEX.

From ALEN

Medical-grade HEPA filter for BreatheSmart 45i & FLEX air purifiers
Captures 99.9% of particles 0.1 micron or larger
Available in Essential (Pure), Advanced (Fresh) and Ultimate (Odor) filtration options
Essential captures airborne dust, viruses and allergens
Advanced adds a carbon layer for asthma triggers, chemicals and VOCs, smoke and other pollutants
Ultimate combines HEPA with a carbon and catalyst layer for odor, mold and pet-filled homes

Guarantee: Active Forever Guarantee: if anything goes wrong, they will fix it.
Packs: Filter subscription available: filters delivered on your schedule, save 10%, modify or cancel anytime.

About the Alen BreatheSmart 45i FLEX HEPA Filter

This is a replacement HEPA filter for Alen BreatheSmart 45i and FLEX air purifiers. It is a medical-grade HEPA filter that captures 99.9% of particles 0.1 micron or larger.

The filter comes in three options. Essential (Pure) captures airborne dust, viruses and allergens. Advanced (Fresh) adds a carbon layer for asthma triggers, chemicals, VOCs, smoke and other pollutants.

Ultimate (Odor) combines HEPA with a carbon and catalyst layer. It is made for homes with odor, mold or pets.

Compatibility: Alen BreatheSmart 45i and FLEX air purifiers
Filter type: Medical-grade HEPA
Efficiency: 99.9% of particles 0.1 micron or larger
Essential (Pure): HEPA; captures dust, viruses and allergens
Advanced (Fresh): HEPA plus carbon layer; asthma triggers, chemicals, VOCs, smoke and other pollutants
Ultimate (Odor): HEPA plus carbon and catalyst layer; odor, mold and pet households