Code of Federal Regulations > Title 40 > Chapter I > Part 53 > Subpart F > Appendix - Table F-2 to Subpart F of Part 53—Particle Sizes and Wind Speeds for Full Wind Tunnel Test, Wind Tunnel Inlet Aspiration Test, and Static Chamber Test

Regulations last checked for updates: Feb 22, 2025

Title 40 - Protection of Environment last revised: Nov 22, 2025

Appendix - Table F-2 to Subpart F of Part 53—Particle Sizes and Wind Speeds for Full Wind Tunnel Test, Wind Tunnel Inlet Aspiration Test, and Static Chamber Test

Primary Partical Mean Size ^a (µm)	Full Wind Tunnel Test		Inlet Aspiration Test		Static Fractionator Test	Volatility Test
Primary Partical Mean Size ^a (µm)	2 km/hr	24 km/hr	2 km/hr	24 km/hr	Static Fractionator Test	Volatility Test
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.

authority: Sec. 301(a) of the Clean Air Act (42 U.S.C. sec. 1857g(a)), as amended by sec. 15(c)(2) of Pub. L. 91-604, 84 Stat. 1713, unless otherwise noted

source: 40 FR 7049, Feb. 18, 1975, unless otherwise noted.