Choose Knka APH4000 if you want lower noise.
Which purifier has higher CADR?
The Coway AP-1512HH(W) has a smoke CADR of 233 CFM versus 226 CFM for the Knka APH4000, a difference of 3%.
Which purifier is quieter?
Knka APH4000 is quieter (22 vs 53 dB).
Which purifier covers a larger room?
Coway AP-1512HH(W) fits a larger room (about 361 vs 350 sq ft recommended from CADR).
Which purifier has better smart features?
Neither lists Wi-Fi or app control in our sources.
Which purifier has better filtration?
Both list HEPA filtration.
Bottom line
Choose Knka APH4000 if you want lower noise.
| Metric | Coway AP-1512HH(W) | Knka APH4000 | Difference / Winner |
|---|---|---|---|
| Smoke CADR | 233 CFM | 226 CFM | Coway AP-1512HH(W) (+3%) |
| Recommended room size | 361 sq ft | 350 sq ft | Coway AP-1512HH(W) (+3%) |
| Manufacturer claimed coverage | 1748 sq ft | 1695 sq ft | — |
| Minimum noise | 53 dB | 22 dB | Knka APH4000 |
| Filter type | HEPA | HEPA | — |
| Power | 77 W | 45 W | — |
| Wi-Fi / app | No | No | — |
| Dimensions | 16.8 × 18.3 × 9.6 in | — | — |
| Weight | 12.3 lb | 9.7 lb | — |