In addition to NFPA 52 §6.14.1.1, all venting of CNG shall be done outdoors.
16 Tex. Admin. Code § 13.143
The provisions of this §13.143 adopted to be effective June 1, 1994, 19 TexReg 3170; Amended by Texas Register, Volume 46, Number 07, February 12, 2021, TexReg 1042, eff. 2/15/2021