Alen 45i Air Purifier: CADR, Noise, Coverage & Specs
Last updated: Aug 23, 2026
Overview
Alen 45i HEPA Air Purifier, Ultimate Filter, Covers 1,900 Sq Ft
CADR and room size
CADR (smoke): 255 CFM.
What room size is the Alen 45i suitable for?
Recommended room size based on CADR: about 395 sq ft (CADR × 1.55).
Manufacturer claimed coverage: 1900 sq ft. This claim is higher than 3× CADR, so it is not used for ranking.
Filtration
What filter does it use?
HEPA.
Noise
How loud is it?
Minimum reported noise: 23 dB.
Smart features
Does it have Wi-Fi?
Yes — app or Wi-Fi features are listed.
True HEPA filtration, Whisper-quiet operation, Smart Sensor, Auto Mode
Specifications
- CADR (smoke)
- 255 CFM
- Recommended room size
- 395 sq ft
- Manufacturer claimed coverage
- 1900 sq ft
- Noise
- 23 dB
- Filter type
- HEPA
- Dimensions
- 15"D x 8.5"W x 25"H
- Weight
- 14 pounds
- Wi-Fi / app
- Yes
Comparisons
Methodology
Specifications are compiled from manufacturer documentation, product listings and other cited sources. See methodology.