What is the acceptable head orifice size range for sprinklers installed in kitchen hoods and vent ducts?

The acceptable head orifice size range for sprinklers installed in kitchen hoods and vent ducts corresponds to K-factors of 1.4 to 5.6. This range is specifically chosen because it provides an adequate flow rate and distribution pattern suitable for controlling fires that can occur in cooking areas.

Kitchen environments typically involve higher heat and the potential for grease fires, which requires a more effective sprinkler system that can deliver a higher volume of water over a wider area. The K-factor reflects the relationship between the flow of water through the sprinkler and the pressure applied, meaning that a wider K-factor range allows for flexibility in meeting the demands of various cooking applications.

By utilizing sprinklers within this K-factor range, designers can ensure that the system is capable of responding effectively to fires in kitchens and vent ducts, thereby enhancing safety and compliance with fire protection standards. This consideration helps in the proper design and installation of fire suppression systems in commercial kitchens.