Our verdict
Pick the PuroAir 240 if running cost matters and you want the lower price. Pick the PuroAir 400 if your room is larger.
The central trade-off
Rated room size. PuroAir 400 HEPA Air Purifier: 2,000 sq ft; PuroAir 240 HEPA Air Purifier: 1,000 sq ft.
Power draw. PuroAir 240 HEPA Air Purifier: 45 W; PuroAir 400 HEPA Air Purifier: 80 W.
Price. When we checked, the PuroAir 240 HEPA Air Purifier listed for less ($200 against $325); prices move, so check both buttons.
Side by side
| Specification | PuroAir 240 HEPA Air Purifier | PuroAir 400 HEPA Air Purifier |
|---|---|---|
| Rated room size | 1,000 sq ft | 2,000 sq ft |
| Smoke CADR | Not stated by the maker | Not stated by the maker |
| CADR | Not stated by the maker | Not stated by the maker |
| Quietest setting | Not stated by the maker | Not stated by the maker |
| Noise | 22 dB | Not stated by the maker |
| Power draw | 45 W | 80 W |
| Filters | Not stated by the maker | Not stated by the maker |
| Warranty | 2 years | 2 years |
Values are the makers' published specifications. "Not stated" means the maker doesn't publish it.
Which should you choose?
Choose the PuroAir 240 HEPA Air Purifier if
- Running cost matters
- You want the lower price