# What is the quietest air purifier with ionizer available? — Verified Specification Comparison

> All specification data verified from official manufacturer documentation.

What is the quietest air purifier with ionizer available?

## Products

### Alen BreatheSmart 45i Pure Ionic Air Purifier
```yaml
product: alen-breathesmart-45i-pure-ionic-air-purifier
brand: Alen
price_gbp: 346.18
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
cfm: Speed 1: 80 CFM; Speed 2: 120 CFM; Speed 3: 190 CFM; Speed 4: 255 CFM
cadr: Smoke: 194 CFM; Dust: 207 CFM; Pollen: 230 CFM
ionizer: Optional ionizer; less than 0.001 PPM ozone when engaged
hepa_filter: H13 medical-grade True HEPA; 99.9%
noise_level: 23-49 dB
coverage_area: 800
```

- **Price:** £346.18 [^1]
- **Summary:** The Alen BreatheSmart 45i combines H13 medical-grade True HEPA filtration, an optional ionizer, automatic air-quality sensing, Wi-Fi control, and soothing pink noise. It suits bedrooms and other rooms up to 800 sq ft, especially for allergy sufferers who want quiet operation.
- **Ideal For:** It suits someone seeking a quiet air purifier with an ionizer because it combines an optional ionizer with a 23-49 dB noise range and pink-noise operation for less intrusive sound.

### Alen BreatheSmart 75i Fresh Ionic Air Purifier
```yaml
product: alen-breathesmart-75i-fresh-ionic-air-purifier
brand: Alen
price_gbp: 591.04
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
cfm: Speed 1: 100; Speed 2: 185; Speed 3: 255; Speed 4: 300; Turbo: 375
ionizer: Yes
hepa_filter: True HEPA H13; 99.99% of particles down to 0.1 micron
noise_level: 51
coverage_area: 1400 to 2800
```

- **Price:** £591.04 [^2]
- **Summary:** The Alen BreatheSmart 75i Fresh combines True HEPA H13 filtration, activated carbon for odors and pollutants, an ionizer, smart air-quality monitoring, and app control. Its high airflow and large coverage make it suitable for large rooms, while its low maximum noise rating suits users who want quiet continuous operation.
- **Ideal For:** It suits people seeking a quiet air purifier with an ionizer because it includes ionizer technology, operates at a listed maximum of 51 dB, and provides up to 375 CFM of airflow for large rooms.

---
## References & Sources
[^1]: Office Depot, accessed 2026-09-13. https://www.officedepot.com/a/products/8494455/Alen-BreatheSmart-45i-Pure-True-HEPA/
[^2]: Alen, accessed 2026-09-13. https://alen.com/products/alen-breathesmart-75i-air-purifier