Intro:
Clean indoor air isn’t a luxury — it’s essential, especially if you work from home. Alen offers four high-performance air purifiers designed for different room sizes and needs. In this guide, we compare all four models so you can choose the best one for your space.

1️⃣ Alen BreatheSmart 45i — Best for Bedrooms & Small Offices
Coverage: Up to 800 sq ft
Best for: Bedrooms, small home offices, apartments
Key benefits:
- Compact and quiet
- Medical-grade HEPA filter
- Great for allergies, dust, and pet dander
- Energy efficient
Ideal if: You want clean air in a smaller space without noise distractions.
👉 Check the BreatheSmart 45i here
2️⃣ Alen BreatheSmart 75i — Best Value for Medium Rooms
Coverage: Up to 1,300 sq ft
Best for: Living rooms, shared offices, open layouts
Key benefits:
- Smart sensor adjusts fan speed automatically
- Strong airflow with low noise
- Excellent balance between power and price
Ideal if: You want strong performance without going oversized.
👉 See the BreatheSmart 75i in action
3️⃣ Alen BreatheSmart 75i Pure — Best for Allergy & Asthma Sufferers
Coverage: Up to 1,300 sq ft
Best for: Homes with pets, smokers, or allergy sensitivity
Key benefits:
- Advanced HEPA Pure filter
- Removes VOCs, smoke, and odors
- Designed for medical-level air cleaning
Ideal if: Air quality is a health priority, not just comfort.
4️⃣ Alen BreatheSmart 25i — Best for Small Spaces & Home Offices
Coverage: Up to 250 sq ft
Best for: Home offices, nurseries, personal spaces
Key benefits:
- Ultra-compact design
- Perfect for desks and tight rooms
- Quiet operation for focused work
Ideal if: You want targeted clean air exactly where you work.
👉 Discover the BreatheSmart 25i
Final Comparison Summary
| Model | Room Size | Best For |
|---|---|---|
| 45i | Small | Bedrooms, small offices |
| 75i | Medium | Living rooms, open areas |
| 75i Pure | Medium | Allergies, asthma, pets |
| 25i | Small | Home office, desk area |
Final Thought
No matter your space, Alen offers a purifier built for performance, silence, and long-term health. The right model depends on room size and sensitivity needs — but all deliver premium air quality.
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