The PuroAir 400 is the value play on this list, and it earns that title honestly. You get a HEPA 14 filter — the same grade used in hospitals and clean rooms — covering up to 1,115 sq ft. That's a remarkable spec at this price point.

HEPA 14 is a step above the standard True HEPA (H13) found in most consumer purifiers. It captures 99.995% of particles at 0.1–0.2 microns — the hardest size range to filter. In our particle count tests, the PuroAir 400 performed nearly as well as units costing twice as much.

The build is straightforward — no frills, no flashy design. The control panel is simple: power, fan speed, and a filter replacement indicator. There's no app, no Wi-Fi, no smart features. For many buyers, that simplicity is actually a selling point. No account to create, no connectivity issues, no software updates.

Noise performance is solid. On low, we measured 25 dB — comparable to the premium units. On high, it reaches 50 dB, which is acceptable for daytime use but might be noticeable in a quiet bedroom.

The main limitation is the lack of smart features and the relatively basic design. If you want auto mode, air quality sensors, or app control, you'll need to look elsewhere. But if your priority is clean air at a fair price, the PuroAir 400 delivers.