N.Y. Comp. Codes R. & Regs. tit. 16, § 255.115
(a) The temperature derating factor to be used in the design formula in section 255.105 is determined as follows:
| Gas Temp. in | Temperature |
|---|---|
| degrees | derating |
| Fahrenheit (Celsius) | factor (T) |
| 250 (121) or less | 1.000 |
| 300 (149) | 0.967 |
| 350 (177) | 0.933 |
| 400 (204) | 0.900 |
| 450 (232) | 0.867 |