Ill. Admin. Code tit. 77, § 518.TABLE C
1. ASHRAE Standard 52.2 tests are to be conducted at one of seven air flow rates.
| 118 FPM (.60 m/s) | 492 FPM (2.50 m/s) |
| 246 FPM (1.25 m/s) | 630 FPM (3.20 m/s) |
| 295 FPM (1.50 m/s) | 748 FPM (3.80 m/s) |
| 374 FPM (1.90 m/s) |
| Minimum Efficiency Reporting Values (MERV) ASHRAE Standard 52.2 | ||||||
| Group Number | MERV Rating | E1 Average Particle Size Efficiency (PSE) 0.3-1.0 Microns | E2 Average Particle Size Efficiency (PSE) 1.0-3.0 Microns | E3 Average Particle Size Efficiency (PSE) 3.0-10.0 Microns | Average Arrestance (ASHRAE 52.1) | Minimum Final Resistance (in Water Gauge) |
| MERV 1 | - | - | < 20% | <65% | 0.3m | |
| MERV 2 | - | - | < 20% | 65-69.9% | 0.3m | |
| 1 | MERV 3 | - | - | < 20% | 70-74.9% | 0.3m |
| MERV 4 | - | - | < 20% | 75% or > | 0.3m | |
| MERV 5 | - | - | 20-34.9% | - | 0.6m | |
| 2 | MERV 6 | - | - | 35-49.9% | - | 0.6m |
| MERV 7 | - | - | 50-69.9% | - | 0.6m | |
| MERV 8 | - | - | 70-84.9% | - | 0.6m | |
| MERV 9 | - | <50% | 85% or > | - | 1.0m | |
| 3 | MERV 10 | - | 50-64.9% | 85% or > | - | 1.0m |
| MERV 11 | - | 65-79.9% | 85% or > | - | 1.0m | |
| MERV 12 | - | 80-89.9% | 90% or > | - | 1.0m | |
| MERV 13 | < 75% | 90% or > | 90% or > | - | 1.4m | |
| 4 | MERV 14 | 75-84.9% | 90% or > | 90% or > | - | 1.4m |
| MERV 15 | 85-94.9% | 90% or > | 90% or > | - | 1.4m | |
| MERV 16 | 95% or > | 95% or > | 95% or > | - | 1.4m |
Notes:
(Source: Added at 33 Ill. Reg. 8317, effective June 4, 2009)