Alen BreatheSmart 35i Review: Cleaner Air, Quieter Nights, Smarter Living
Hands on style review for the Alen BreatheSmart 35i with real world use, setup tips, and how it fits into a healthier bedroom.
The Alen BreatheSmart 35i focuses on clean air with a balance of filtration performance, quiet operation, and energy efficiency. It is a strong pick for bedrooms, home offices, nurseries, and open living spaces where noise matters and style should not suffer.
For current pricing and bundles, check the Alen 35i here. We use affiliate links to help support Yawnder at no cost to you.
Key Features
What stands out in daily use.
Setup and Placement
Unbox, remove the filter bag, and seat the filter with the pull tab facing outward for easy changes later. Place the unit where it can draw air from all sides. A foot or two of clearance helps, and corners should be avoided for best circulation.
For bedrooms, keep it near the door or on the wall opposite the bed so the clean air stream flows across the room without a draft on your face.
Auto mode is the easiest way to live with the 35i. The particle sensor reacts to cooking, cleaning, and outdoor pollution that sneaks in when windows open. The front light indicator gives a quick visual on current air quality and can be dimmed at night.
Filtration and Filter Options
The 35i uses a full size filter that seals against the housing. Alen offers HEPA grade media designed to capture fine particles such as dust, pollen, smoke, and pet dander. If odors are a concern, choose a variant with an activated carbon layer to absorb household smells from cooking or pets.
Filter life varies with use. Homes near busy roads or wildfire regions will saturate filters faster than low pollution areas. The change filter reminder and the visible surface of the filter make it easy to know when it is time to swap.
Noise and Energy Use
On the lowest setting the fan is quiet enough for light sleepers. The mid and high settings deliver stronger clean air without a harsh tone. For all day operation, many owners run Auto so it idles quietly and only ramps up when needed. Energy draw is modest at low speeds which makes it practical to run around the clock.
Daily Living and Real Results
In a typical home with pets, the 35i reduces dust on surfaces, helps with seasonal allergies, and manages cooking odors more quickly than a fan alone. During wildfire season or high pollen days, Auto mode responds within minutes and the room becomes noticeably fresher.
The front panel is easy to wipe clean. The single button interface and light ring keep the experience simple enough for any family member to use.
Alen 35i at the Yawnder Showroom
We keep the BreatheSmart 35i on the floor so shoppers can hear the noise profile in person and see the footprint next to furniture. The minimalist design fits well in modern bedrooms and living areas. If you cannot make it in, you can shop the Alen 35i online here.
BreatheSmart 35i vs Other Purifiers
| Model | Best for | Filtration | Smart & auto | Design notes |
|---|---|---|---|---|
| Alen BreatheSmart 35i | Bedrooms and medium to large rooms where quiet matters | HEPA grade options with carbon variants | Air quality sensor and auto mode | Slim panel look with finish options |
| Coway AP‑1512HH | Budget friendly all rounder for small to medium rooms | HEPA with optional deodorization | Auto mode with light indicator | Compact footprint with classic look |
| Blueair Blue Pure 211 Plus | High airflow for large rooms | Particle plus carbon combo filter | Simple single button interface | Fabric prefilter in multiple colors |
| Levoit Core 400S | Smart control from app with voice assistants | HEPA style filter with carbon | Auto mode and app scheduling | Cylinder body and small footprint |
| Dyson Purifier Hot Cool | All season rooms needing heat or fan circulation | Sealed filter system | App and voice control | Sculptural design with higher price |
Pros and Considerations
What we like
- Quiet operation in bedroom use.
- Auto mode with responsive sensor keeps air clean without manual tweaks.
- Full size filter with solid seal and easy access door.
- Attractive design that blends with decor.
Keep in mind
- Filter cost is higher than compact purifiers, although filter life is longer in clean environments.
- No built in humidifier, which some winter climates may want as a separate device.
Final Verdict
The Alen BreatheSmart 35i delivers clean air with a calm sound profile and a design that suits real homes. It is easy to live with, efficient to run, and flexible through filter choices. For bedrooms, nurseries, and main living spaces, it is an easy recommendation.
Disclosure: We may earn a commission when you purchase through our links.
Alen BreatheSmart 35i vs Other Air Purifiers
See where the 35i shines in filtration, noise, coverage, and design. Try it in our showroom or explore it online.
Why Alen 35i wins
- ✓Quiet performance ideal for bedrooms and nurseries while maintaining strong filtration.
- ✓Auto mode + sensor that reacts quickly to cooking, cleaning, and outdoor pollutants.
- ✓Filter flexibility with HEPA-grade options and carbon variants for odors and VOCs.
- ✓Design that blends into modern rooms with multiple panel finishes.
| Model | Best for | Filtration | Smart & auto | Design notes |
|---|---|---|---|---|
| Alen BreatheSmart 35i | Bedrooms, nurseries, medium to large rooms where quiet matters | HEPA-grade options, carbon variants for odors | Air quality sensor with Auto mode, visual indicator | Slim panel with finish options |
| Coway AP‑1512HH | Budget-friendly small to medium rooms | HEPA with deodorization | Auto mode and air quality light | Compact, utilitarian look |
| Blueair Blue Pure 211 Plus | Large rooms needing high airflow | Particle + carbon combo filter | Simple single-button, limited sensing | Color fabric prefilter, larger footprint |
| Levoit Core 400S | Smart home control and voice assistants | HEPA-style with carbon | Auto mode, app scheduling | Modern cylinder, small footprint |
| Dyson Purifier Hot+Cool | All-season rooms needing heat/fan + purification | Sealed system with HEPA + carbon | App + voice control, oscillation | Sculptural design, premium price |
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