# What is the best compact air purifier for small spaces? — Verified Specification Comparison

> All specification data verified from official manufacturer documentation.

What is the best compact air purifier for small spaces?

## Products

### Alen BreatheSmart 35i
```yaml
product: alen-breathesmart-35i
brand: Alen
price_gbp: 215.66
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
cadr: Smoke 150 CFM, Dust 164 CFM, Pollen 195 CFM
filter_types: True HEPA H13; optional carbon layer (Advanced/Ultimate)
coverage_area: 700 - 1,400
energy_consumption: Integrated energy factor 6.7 cfm/W; Annual energy use 136 kWh/yr
maximum_noise_level: 42
filter_replacement_interval: 9 - 12 months (depends on filter type; Alen guidance)
```

- **Price:** £215.66 [^1]
- **Summary:** The Alen BreatheSmart 35i is a compact, app-connected True HEPA H13 air purifier with smart sensors, four fan speeds, and optional carbon-enhanced filters for VOCs and odors. It offers quiet operation (up to 42 dB), CADR ratings suitable for small-to-medium rooms, and integrated filter-life tracking via RFID and the Alen Air app.
- **Ideal For:** Ideal for small spaces because it combines True HEPA H13 filtration, CADR up to 195 CFM (pollen) and coverage rated 700-1,400 sq ft with very low maximum noise (42 dB).
- **Additional Sources:** [^2], [^3], [^1], [^2], [^3]

### Levoit Vital 100S
```yaml
product: levoit-vital-100s
brand: Levoit
price_gbp: 82.08
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
cadr: 134, 146, 186
filter_types: Washable pre-filter, True HEPA (bonded particle), Activated carbon (pellet)
coverage_area: 219
energy_consumption: 27.3 (max)
maximum_noise_level: 53.8
air_changes_per_hour: 4.8
filter_replacement_interval: 9-12 months
```

- **Price:** £82.08 [^4]
- **Summary:** The Levoit Vital 100S is a compact smart air purifier with a three-stage filtration system (washable pre-filter, bonded particle True HEPA, and pelleted activated carbon), CADR up to 141 CFM and coverage for about 219 sq ft at 4.8 ACH. It includes smart app and auto modes, air quality sensor, and quiet sleep settings, making it suitable for bedrooms and small to medium rooms. The pre-filter is washable and the main filter combination should be replaced roughly every 9-12 months.
- **Ideal For:** Ideal for small spaces because it delivers 4.8 ACH in ~219 sq ft with a dust CADR of 146 CFM and a compact footprint.
- **Additional Sources:** [^5], [^6], [^4], [^5], [^6]

### Vissani VK-6105
```yaml
product: vissani-vk-6105
brand: Vissani
price_gbp: 33.54
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
filter_types: True HEPA, pre-filter, activated carbon
coverage_area: 130
energy_consumption: 32
filter_replacement_interval: replace when indicator lights or as needed (no interval stated)
```

- **Price:** £33.54 [^7]
- **Summary:** Compact 3-stage air purifier with True HEPA, pre-filter and activated carbon designed for small rooms up to 130 sq ft. Low power (32 watts), touch controls, timer and night mode make it suitable for bedrooms and offices. Simple to maintain with a removable base cover for filter access.
- **Ideal For:** Best for small spaces because it covers 130 sq ft and uses a True HEPA 3-stage filtration while consuming just 32 watts.
- **Additional Sources:** [^7]

---
## References & Sources
[^1]: Alen (official store), accessed 2026-06-14. https://alen.com/products/alen-breathesmart-35i-air-purifier
[^2]: ENERGY STAR product listing, accessed 2026-06-14. https://www.energystar.gov/productfinder/product/certified-room-air-cleaners/details/4481445
[^3]: Alen on-sale listing, accessed 2026-06-14. https://alen.com/collections/on-sale
[^4]: Levoit (official), accessed 2026-06-14. https://levoit.com/products/vital-100s-p-smart-air-purifier
[^5]: HouseFresh (retailer/review shop listing), accessed 2026-06-14. https://housefresh.com/levoit-air-purifiers/
[^6]: AirPurifierFirst (specialist retailer/review), accessed 2026-06-14. https://www.airpurifierfirst.com/review/levoit-vital-100s/
[^7]: The Home Depot, accessed 2026-06-14. https://www.homedepot.com/p/Vissani-HEPA-3-Stage-Air-Purifier-for-Small-Room-130-sq-ft-in-White-VK-6105/323585091/1