StacksVerified U.S. regulatory reference

40 CFR Part 63, Table 21

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov
Tank ColorAverage Storage Temperature (Ts)
WhiteTA a = 0
AluminumTA = 2.5
GrayTA = 3.5
BlackTA = 5.0

a TA is the average annual ambient temperature in degrees Fahrenheit.