Pyro-Chem 1H Nozzle, Single Item - 551029

The Pyro-Chem 1H Nozzle (551029) is a high-performance, OEM discharge component engineered specifically for the Kitchen Knight II wet chemical fire suppression system. In the high-velocity environment of a commercial kitchen fire, the how of agent delivery is just as critical as the what. The 1H nozzle is designed to atomize the Pyro-Chem wet chemical agent into a specific spray geometry that maximizes surface area coverage while providing the kinetic force necessary to penetrate the thermal column of a grease fire.

Constructed from heavy-duty, corrosion-resistant brass, the 1H nozzle is the industry standard for protecting medium-to-high hazard cooking appliances. It is a one-flow-point nozzle, meaning it is mathematically weighted within the system's hydraulic calculations to ensure balanced pressure across the entire pipe network. For fire protection professionals, the 551029 is not just a fitting. It is the calibrated tool that ensures your facility meets the stringent discharge requirements of UL 300 and NFPA 17A.

The Science of Suppression: Flow Points and Spray Geometry

One-Flow-Point Weighting

In fire suppression design, every nozzle is assigned a Flow Point (FP) value. The 1H nozzle is a 1.0 FP component. This allows designers to easily calculate the total system load on the agent tanks. Accurate FP counting ensures the last nozzle in the line receives the same discharge pressure as the first, preventing weak zones in the suppression blanket.

Atomization and Saponification

When the agent reaches the 1H nozzle, it is forced through a specialized internal geometry that shears the liquid into micro-droplets. These droplets are engineered to react instantly with hot oils to trigger saponification, a chemical process that turns grease into a non-flammable soap-like foam. The 1H nozzle's specific spray angle ensures this foam blanket is deposited evenly.

Nozzle Aiming Point (NAP) Precision

The H in 1H refers to its specific horizontal or height-based discharge characteristics. It is engineered to be mounted at a specific distance from the hazard. This precise aiming ensures the agent does not overshoot the target or dissipate before reaching the fuel source.

• High-Efficiency Deep Fryers: Providing the dense, cooling mist required to suppress deep-seated grease fires.
• Commercial Griddles: Ensuring full-surface coverage for large cooking areas where fire can spread laterally.
• Charbroilers: Delivering the kinetic force needed to reach into the heavy flame zones of open-flame cooking equipment.
• Wok Ranges: Offering the targeted protection needed for high-heat, high-volume Asian cooking lines.
• Industrial Donut Fryers: Protecting high-volume oil reservoirs in bakery and institutional kitchen settings.

To maintain NFPA 96 compliance, the 1H nozzle must follow a strict professional maintenance protocol:

• Semi-Annual Inspection: During the mandatory 6-month check, a certified fire technician must verify that the nozzle is not obstructed by grease buildup.
• Blow-Off Cap Replacement: The rubber or metal blow-off caps should be inspected for flexibility. If a cap is missing, it can prevent the 1H nozzle from discharging correctly, leading to system failure liability.
• Proper Nozzle Alignment: Hood cleaners often bump nozzles. Technicians must verify that the 1H nozzle is still pointed at its specific Nozzle Aiming Point (NAP).
• Post-Discharge Replacement: Following a fire, 1H nozzles should be cleaned or replaced. Extreme heat can sometimes alter the metallurgy of the brass or bake grease into the precision orifice.

Can I use a 1H nozzle on an Ansul system?
No. The 1H nozzle is specifically factory-approved for Pyro-Chem Kitchen Knight II hydraulics. Mixing brands can lead to uneven discharge pressure and void your fire insurance policy.

What is the difference between a 1H and a 2H nozzle?
The number refers to the Flow Point (FP). A 1H nozzle counts as one flow point, while a 2H nozzle counts as two. Designers choose the model based on the appliance size and the agent tank capacity.

Do I need a blow-off cap for this nozzle?
Yes. In a commercial kitchen, the orifice will quickly fill with grease. A nozzle cap is a mandatory safety component that protects the nozzle until the moment of discharge, ensuring system readiness.