Pyro-Chem 2H Nozzle, 10 Pack - 551028

The Pyro-Chem 2H Nozzle (Part No. 551028) is a high-volume, two-flow-point (2.0 FP) discharge component designed for the Kitchen Knight II fire suppression system. While the 1H nozzle serves as the standard for general coverage, the 2H variant is engineered for high-proximity applications where a concentrated, high-velocity discharge is required to penetrate the thermal barrier of a deep-seated grease fire.

By delivering double the volume of wet chemical agent compared to 1.0 FP nozzles, the 2H model is the primary specified choice for high-limit deep fryers and high-BTU charbroilers. Its specific orifice geometry ensures the agent is atomized with enough kinetic force to achieve rapid saponification in high-heat environments without causing oil splash. This nozzle allows fire protection designers to protect large, high-output cooking equipment with fewer piping drops, maintaining a clean hood profile while meeting the rigorous discharge standards of UL 300 and NFPA 17A.

The 551028 must be installed by a licensed fire suppression technician in strict accordance with the Kitchen Knight II design manual and the system's as-built drawings. Because the 2H nozzle consumes 2.0 flow points, the total flow point count of all nozzles in the system must not exceed the rated capacity of the agent tank. Substituting a 2H for two 1H nozzles is only permissible where the design manual explicitly allows it, as the spray pattern of a single 2H may not cover the same linear footprint as two 1H nozzles.

Nozzle placement must conform to the specific Nozzle Aiming Point (NAP) for each protected appliance as defined in the KKII design manual. The factory-authorized blow-off cap must be installed at all times to protect the precision-machined orifice from grease loading. During each semi-annual inspection, technicians must verify the cap is present and undamaged and that the orifice is free of obstruction. Any nozzle showing signs of corrosion, deformation, or orifice restriction must be replaced with a new OEM 551028 to maintain the system's UL listing.

How does the 2H nozzle differ from the 2D nozzle?

The difference lies in the spray pattern and velocity. The 2D is designed for wide-area distribution, while the 2H is a high-velocity nozzle designed to punch through the rising heat of high-output appliances, delivering the agent more directly to the fuel source.

Can I replace two 1H nozzles with one 2H nozzle?

Only if the Manufacturer's Design Manual allows it. While the flow point count is the same (1.0 + 1.0 = 2.0), the spray pattern of a single 2H may not cover the same linear footprint as two 1H nozzles. Always refer to your as-built system drawings before making a substitution.

Why is the 2H often used in high-limit fryers?

High-efficiency burners create an intense thermal column. A 1.0 FP nozzle can sometimes drift or atomize too finely to penetrate that heat. The 2H provides the mass and velocity needed to ensure the chemical agent reaches the oil surface to initiate the foam blanket.