Code of Federal Regulations > Title 40 > Chapter I > Part 63 > Subpart G > Appendix - Table 25 to Subpart G of Part 63

Regulations last checked for updates: May 18, 2024

Title 40 - Protection of Environment last revised: May 16, 2024

Appendix - Table 25 to Subpart G of Part 63—Effective Column Diameter (Fc)

Column type	Fc (feet)
9-inch by 7-inch built-up columns	1.1
8-inch-diameter pipe columns	0.7
No construction details known	1.0

authority: 42 U.S.C. 7401

source: 57 FR 61992, Dec. 29, 1992, unless otherwise noted.