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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.
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Related Code Sections

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 ...