| MERV | Captures | Best For |
|---|---|---|
| 1-4 | Pollen, dust mites | Basic protection |
| 5-8 | Mold spores, pet dander | Residential standard |
| 9-12 | Fine dust, auto emissions | Better air quality |
| 13-16 | Bacteria, smoke | Allergies, hospitals |
Most homes do best with MERV 8-13. Higher ratings require more fan power.