| 20 | n/a | n/a | < 0.30 µ Particle Size | Cleanrooms |
| 19 | n/a | n/a | Virus Unattached | Radioactive Materials |
| 18 | n/a | n/a | Carbon Dust | Pharmaceutical |
| 17 | n/a | n/a | All Combustion Smoke | Carcingenic Materials |
| 16 | n/a | n/a | 0.30 - 1.0 µ Particle Size | General Surgery |
| 15 | >95% | n/a | All Bacteria | Hospital Unpatient Care |
| 14 | 90-95% | >98% | Most Tobacco Smoke | Smoking Lounges |
| 13 | 89-90% | >98% | Droplet Nuclei (Sneeze) | Superior Commercial Buildings |
| 12 | 70-75% | >95% | 1.0-3.0 µ Particle Size/Legionella | Superior Residential |
| 11 | 60-65% | >95% | Humidifier Dust/Lead Dust | Better Commercial Buildings |
| 10 | 50-55% | >95% | Milled Flour/Auto Emissions | Hospital Labs |
| 9 | 40-45% | >90% | Welding Fumes | Hospital Labs |
| 8 | 30-35% | >90% | 3.0-10.0 µ Particle Size | Commercial Buildings |
| 7 | 25-30% | >90% | Mold Spores/Hair Spray | Better Residential |
| 6 | <20% | 85-90% | Fabric Protector/Dusting Aids | Industrial Workplace |
| 5 | <20% | 85-90% | Cement Dust/Pudding Mix | Paint Booth Inlet |
| 4 | <20% | 75-80% | 10.0 µ Particle Size/ Pollen | Minimal Filtration |
| 3 | <20% | 70-75% | Dust Mites/Sanding Dust | Residential |
| 2 | <20% | 65-70% | Spray Paint Dust | Residential |
| 1 | <20% | <65% | Textile/Carpet Fibers | Window & A/C Units |
