Alen Flex HEPA Air Purifier
- H13 HEPA, 99.9% of particles to 0.1 micron
- 700 sq ft in 30 minutes, 1400 sq ft per hour
- 25 db quiet operation
- 36 watts, built to run 24/7
- CARB and EPA certified
- 15 pounds, 8.5 x 15 x 25 inches
Last refreshed Sep 8, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A quiet, efficient HEPA purifier for a bedroom, nursery or office with app control. It is meant for one room, not a whole open-plan floor.
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ASIN: B0FM4FYN3PCategory: HEPA Air Purifiers
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Overview
A bedroom, nursery or home office is the room this Alen purifier is sized for, pulling air through a medical-grade HEPA Pure filter that traps dust, dander and fine particles. It runs quietly on low power and connects to an app.
Medical-grade filtration with very low noise makes it a fit for sleeping rooms. Lifetime coverage depends on keeping a filter subscription.
Who it's for
Allergy sufferers, pet owners and parents get quiet filtration for one room. Those who want odor or smoke specialist filters should check other filter options, since this one is the Pure filter.
Pros and cons
- H13 HEPA filtration
- Low power draw
- CARB and EPA certified
- App control and data
- Sized for one room
- Lifetime coverage needs a filter subscription
- No odor-specific filter in this version
Performance notes
Cleaning speed depends on how many times the fan moves the room's air through the filter each hour, which the room-size figures describe. HEPA media traps very small particles, but it does not remove gases on its own. A quiet motor allows it to run all night.
Specifications
| Brand | Alen |
|---|---|
| Dimensions & fit | |
| Particle Retention Size | 0.1 micron |
| Item Dimensions D x W x H | 8.5 x 15 x 25 inches |
| Item weight | 15 pounds |
| Capacity & performance | |
| Noise Level | 25 db |
| Wattage | 36 watts |
| Included components | |
| Included Components | Air purifier and filter |
| Other details | |
| Floor Area | 700 sq ft in 30 minutes, 1400 sq ft per hour |
| Filter Class | H13 HEPA |
| Contaminant Filtration Capability | Allergens, dust, pet dander |
| Control Type | Touch, app |
| Specification Met | CARB certified, EPA certified |
Frequently asked questions
Can the Alen BreatheSmart FLEX clean a whole house?
It is made for smaller spaces. Alen rates it at 700 sq ft in 30 minutes and up to 1400 sq ft per hour.
What filter comes with the Alen BreatheSmart FLEX?
The H13 HEPA Pure filter, which captures 99.9% of particles as small as 0.1 micron.
How loud is the Alen BreatheSmart FLEX?
The noise level is listed at 25 db.
What is the Alen Lifetime Assurance?
With a filter subscription, Alen will fix or replace any issues for as long as the subscription runs.