Choose either model after comparing CADR, recommended room size, noise, and filtration below.
Which purifier has higher CADR?
Honeywell HPA300 has published CADR; Honeywell Allergen Plus 3-in-1 HEPA Fan Air Purifier does not.
Which purifier is quieter?
Honeywell HPA300 lists a minimum of 53 dB; Honeywell Allergen Plus 3-in-1 HEPA Fan Air Purifier has no published figure.
Which purifier covers a larger room?
Honeywell HPA300 is recommended for about 465 sq ft based on CADR.
Which purifier has better smart features?
Neither lists Wi-Fi or app control in our sources.
Which purifier has better filtration?
Honeywell Allergen Plus 3-in-1 HEPA Fan Air Purifier lists HEPA; Honeywell HPA300 lists True HEPA.
Bottom line
Choose either model after comparing CADR, recommended room size, noise, and filtration below.
| Metric | Honeywell Allergen Plus 3-in-1 HEPA Fan Air Purifier | Honeywell HPA300 | Difference / Winner |
|---|---|---|---|
| Smoke CADR | — | 300 CFM | — |
| Recommended room size | — | 465 sq ft | — |
| Manufacturer claimed coverage | 1928 sq ft | — | — |
| Minimum noise | — | 53 dB | — |
| Filter type | HEPA | True HEPA | — |
| Wi-Fi / app | No | No | — |