Pyro-Chem 1H Nozzle, 10 Pack - 551029

The Pyro-Chem 1H Nozzle (Part No. 551029) is a precision-engineered high-proximity discharge component designed for the Kitchen Knight II fire suppression system. While L-series nozzles are calibrated for broader coverage from a distance, the 1H model is optimized for tight-clearance environments where the nozzle must be mounted within 0 to 6 inches of the hazard. This makes it the industry standard for protecting Single-Bank and V-Bank exhaust plenums.

Each nozzle in this 10-pack bulk set is weighted as exactly one flow point (1.0 FP), allowing for streamlined hydraulic calculations. Manufactured from a corrosion-resistant alloy, the 551029 is built to survive the extreme thermal cycling of a 24/7 commercial kitchen. When triggered, the high-velocity agent delivery initiates rapid saponification to extinguish grease fires at the filtration source, preventing the fire from entering the ductwork. This bulk pack is the strategic choice for service contractors performing full-facility overhauls while maintaining strict UL 300 and NFPA 17A compliance.

Each 551029 nozzle 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. Nozzle placement must conform to the specific Nozzle Aiming Point (NAP) and mounting proximity requirements for high-proximity plenum and filtration applications. The 1H orifice geometry is calibrated for a concentrated, high-velocity pattern within 0 to 6 inches of the hazard; mounting beyond this range will leave coverage gaps and constitutes a code violation.

Metal blow-off caps must be installed on every 551029 nozzle to protect the precision-machined orifice from carbonized grease buildup in high-heat plenum zones. During each semi-annual inspection, technicians should check all nozzles for orifice restriction, thread damage, or signs of heat distortion. The 10-pack format allows for complete replacement of an entire hood's plenum nozzle array in a single service visit, ensuring uniform spray patterns and uninterrupted UL 300 listing compliance across the facility.

What defines a "high-proximity" (1H) application?

A high-proximity application is one where the nozzle is situated in the narrow confines of an exhaust hood plenum. The 1H nozzle is designed to discharge its agent in a concentrated pattern that can overcome the high-velocity air suction of the exhaust fan, ensuring the chemical reaches the grease filters effectively.

Can the 1H nozzle be used interchangeably with the 1L nozzle?

No. Although both are 1.0 Flow Point nozzles, their spray geometries differ. The 1L is for wider, further-away coverage, while the 1H is for narrower, closer discharge. Swapping them can leave blind spots in your fire protection coverage, which is a code violation.

Why does the 10-pack include metal blow-off caps?

Metal caps are required in the highest-heat zones. They protect the precision-machined 1H orifice from becoming baked with carbonized grease. During discharge, the internal pressure pops the cap off, ensuring a fully unobstructed flow during a fire emergency.