KNKA APH4000 Air Purifier: CADR, Noise, Coverage & Specs
Last updated: Aug 22, 2026
Overview
KNKA Air Purifier for Home Bedroom Large Room Up to 1,695 Ft² in 1 Hr, HEPA Air Cleaner with Washable Pre-Filter, AQI Display, ECO Mode, Sleep Mode, Pet Mode…
CADR and room size
CADR (smoke): 226 CFM.
What room size is the KNKA APH4000 suitable for?
Recommended room size based on CADR: about 350 sq ft (CADR × 1.55).
Manufacturer claimed coverage: 1695 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: 22 dB.
Smart features
Does it have Wi-Fi?
No published Wi-Fi or app control in our sources.
AQI Display, Washable Pre-Filter, ECO Mode, Sleep Mode
Specifications
- CADR (smoke)
- 226 CFM
- Recommended room size
- 350 sq ft
- Manufacturer claimed coverage
- 1695 sq ft
- Noise
- 22 dB
- Filter type
- HEPA
- Power
- 45
- Dimensions
- 8.15"D x 12.36"W x 17.09"H
- Weight
- 9.7
- Wi-Fi / app
- No
Comparisons
Methodology
Specifications are compiled from manufacturer documentation, product listings and other cited sources. See methodology.