The opening in a cap, spud or other device whereby the flow of gas is limited and through which the gas is discharged to the burner.
Related Code Sections
23.4.4.8* Plans and Calculations, Orifice Plates
Orifice plates shall not be used for balancing the system ...
27.2.4.9* Plans and Calculations, Orifice Plates
Orifice plates shall not be used for balancing the system ...
27.2.4.9.2 Plans and Calculations,
Unless the requirements of 27.2.4.9.3 or 27.2.4.9.4 are met, mixing of sprinklers of different K-factors by reducing the K-factor of adjacent ...
27.2.4.9.3 Plans and Calculations,
Sprinklers with different K-factors shall be acceptable for special use such as exposure protection, small rooms or enclosures, or directional ...
27.2.4.9.4 Plans and Calculations,
Extended-coverage and residential sprinklers with a different K-factor shall be acceptable for part of the protection area where installed ...