40 CFR Part 53, Table F-2 — Particle Sizes and Wind Speeds for Full Wind Tunnel Test, Wind Tunnel Inlet Aspiration Test, and Static Chamber Test
Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
| Primary Partical Mean Size a (µm) | Full Wind Tunnel Test | Inlet Aspiration Test | Static Fractionator Test | Volatility Test |
|---|---|---|---|---|
| 2 km/hr | 24 km/hr | 2 km/hr | 24 km/hr | |
| 1.5±0.25 | S | S | | | S | |
| 2.0±0.25 | S | S | | | S | |
| 2.2±0.25 | S | S | | | S | |
| 2.5±0.25 | S | S | | | S | |
| 2.8±0.25 | S | S | | | S | |
| 3.0±0.25 | | | L | L | | |
| 3.5±0.25 | S | S | | | S | |
| 4.0±0.5 | S | S | | | S | |
| Polydisperse Glycerol Aerosol | | | | L |
a Aerodynamic diameter.
S = Solid particles.
L = Liquid particles.