Choose either model after comparing CADR, recommended room size, noise, and filtration below.
Which purifier has higher CADR?
CADR is not published for either model.
Which purifier is quieter?
Both list a minimum of 20 dB.
Which purifier covers a larger room?
Recommended room size cannot be derived because CADR is missing.
Which purifier has better smart features?
Both list smart features (360° Air Intake, Smart Auto Mode, Real-time Air Quality Display, Sleep Mode vs 360° Air Intake, Smart Auto Mode with PM2.5 sensor, PM2.5 digital display, Aromatherapy option, 20 dB Sleep Mode, App control via Eco app).
Which purifier has better filtration?
Ecoself HAP609 lists 3-Stage Filter; Ecoself HAP609 knq3pp lists HEPA (H13).
Bottom line
Choose either model after comparing CADR, recommended room size, noise, and filtration below.
| Metric | Ecoself HAP609 | Ecoself HAP609 knq3pp | Difference / Winner |
|---|---|---|---|
| Manufacturer claimed coverage | 1800 sq ft | 1800 sq ft | — |
| Minimum noise | 20 dB | 20 dB | — |
| Filter type | 3-Stage Filter | HEPA (H13) | — |
| Replacement interval | — | Every 6–8 months | — |
| Power | 20 W | — | — |
| Wi-Fi / app | Yes | Yes | — |
| Dimensions | 7.2 × 7.2 × 13.9 in | — | — |
| Weight | 3.79 lb | 3.8 lb | — |