40 C.F.R. Table 25 to Subpart G of Part 63
Effective Column Diameter (F c )
Cite as 40 C.F.R. Table 25 to Subpart G of Part 63 (2026)
Column type F c (feet) 9-inch by 7-inch built-up columns 1.1 8-inch-diameter pipe columns 0.7 No construction details known 1.0