Ansul 1/2 N Nozzle - 443321

The Ansul 443321 is the 1/2 N nozzle (new style) for the Ansul R-102 Restaurant Fire Suppression System, a pre-engineered wet chemical kitchen fire suppression system used in a wide variety of commercial kitchen environments. The R-102 discharges ANSULEX Low pH Liquid Fire Suppressant through a pre-engineered piping network and out the system's discharge nozzles to suppress grease fires in commercial kitchen hoods, ducts, plenums, filters, and protected cooking appliances. This nozzle ships with a metal blow-off cap pre-installed.

The R-102 nozzle family includes 11 nozzle types in total, each designed to create a specific discharge pattern matched to a particular hazard or appliance type. The nozzle designation "1/2 N" identifies this nozzle's flow characteristics within that family. The "new style" designation on this nozzle (443321) indicates it is the current production version, distinguishing it from the older design of the same type. All R-102 nozzles are chrome-plated and machined to a consistent outside profile; they differ internally at the tip, where the orifice and deflector geometry create the spray pattern specific to that nozzle's application.

R-102 System Design Approaches

The R-102 system is designed in one of two configurations: appliance-specific or overlapping. In the appliance-specific design, each nozzle is aimed at the hazard area of a specific cooking appliance. In the overlapping design, nozzles are arranged in a straight line at a spacing of up to 25.5 inches and a height of 40 to 45 inches above the cooking surface, with overlapping discharge patterns creating a continuous zone of protection across all appliances in the coverage area. The specific nozzle type required for each position in either design is determined by the authorized Ansul R-102 distributor per the R-102 Design, Installation, Recharge, and Maintenance Manual (P/N 418087).

The R-102 is a pre-engineered wet chemical system under NFPA 17A. Installation and service must be performed by an authorized Ansul R-102 distributor per the R-102 Design, Installation, Recharge, and Maintenance Manual (P/N 418087).

• Nozzle Selection by Authorized Distributor: The specific R-102 nozzle type required for each position in the system is determined by the certified installer based on the hazard type, appliance geometry, and the system design configuration (appliance-specific or overlapping).
• Cap Inspection: The metal blow-off cap must be present and undamaged at each semiannual service inspection. Damaged or missing caps must be replaced before returning the system to service.
• Semiannual Service: All nozzles are inspected for blockage, physical damage, and correct positioning per NFPA 17A at each required service interval.

What does "new style" mean for this nozzle?

Ansul periodically updates its nozzle designs while maintaining the same nozzle type designation. The "new style" designation for the 443321 identifies it as the current production version of the 1/2 N nozzle type, as opposed to an older design. When ordering replacement nozzles, confirm the nozzle type designation with your authorized Ansul distributor to ensure the correct version for your installed system.

Are R-102 nozzles interchangeable between positions?

No. Each of the 11 R-102 nozzle types has a specific orifice and deflector design calibrated for particular discharge patterns and hazard coverage. Substituting one nozzle type for another in a position designated for a different type changes the hydraulic characteristics and coverage of the system and voids the UL 300 listing for that position.