22
Overlapping Protection
Standard overlapping protection is 5 nozzles (20 flow points) at 36” max spacing. Exceptions are noted
below. All overlapping nozzles must be spaced no more than 12” from each end of the appliance, and
located at the centerline of the 30” hazard zone (front to back), at the same height, and aimed straight
down. The nozzle height must be 35” to 50” above the appliance cooking surface, except for woks, where
the height is measured 3 inches below the top rim of the wok. The nozzles must be positioned along the
total hazard zone length to allow protection of each appliance in the hazard zone.
Exceptions to standard overlapping protection:
• Large/Industrial fryers over 14” wide, 4 nozzles at 30” max nozzle spacing per tank.
• Woks larger than 24 inch diameter, 4 nozzles at 30” max spacing per tank.
• Appliance with shelves, 4 nozzles at 36” max spacing per tank.
• Solid Fuel Appliances, 3 nozzles at 24” max spacing per tank.
Refer to “Coverage Exceptions” on page 21 for more information.
Overlapping Coverage - Group Protection
Overlapping protection provides coverage for a continuous hazard zone, with all nozzles at consistent
position (i.e., zone centerline), spacing, and height.
When there is an area within a hazard zone for which continuous overlapping coverage is not applicable,
the overlapping protection zone may be ended, and a new zone started for the new group of appliances.
Examples where continuous protection may be interrupted include a counter, storage or prep area,
appliance not requiring protection (e.g., enclosed oven) or an appliance requiring dedicated appliance
coverage.
The examples on page 23 provide details of group overlapping protection for interrupted zones. This
section illustrates the methodology for defining when a new hazard zone is required, as described above.
For appliance specific overlapping coverage parameters (e.g., nozzle spacing and height requirements),
refer to page 24 through page 31.
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