low pressure water mist nozzle


The FIREKILL™ NEPTUN OH Low pressure water mist nozzle tested and approved to Resolution MSC.265(84) for open public spaces.

Min. water pressure

6 bar ≈87 psi

Max. working pressure

16 bar ≈232 psi

Drop size

DV90 < 300 μm

Water capacity design

According to IMO MSC. 265(84)

Kv metric


Flow rate at min pressure

35.5 l/min

Nominal density

2.22 mm/m2


4.00 m x 4.00 m


Aesthetic fire protection

The FIREKILL™ NEPTUN OH nozzles are installed recessed into the ceiling with the nozzle rosette flush with the surface and the nozzle Cover Plate protruding 10-15 mm from the surface, being the only visible parts of the nozzle in its daily use or directly into a visible pipe system in retrofit cases. The FIREKILL™ NEPTUN OH nozzles can be delivered in different paint and finishes making the system blend in with almost any type of surface, securing the aesthetics of the surroundings. The nozzles can also be delivered with logo print.



The FIREKILL™ NEPTUN OH system for protection of open public spaces is unique as it requires very low water pressures and water flow rates. The system utilizes the automatic low-pressure water mist nozzles Model OH-L2 which are patented automatic, fine water spray nozzles. The OH-L2 nozzle creates a homogenous fine water mist, which absorbs heat, reduces radiant heat and causes oxygen depletion near the fire, which in turn controls and suppresses the fire. This homogenous mist consists of a high concentration of very small droplets. Because of the small mass of the droplets, the nozzle creates a large coverage, further minimizing the water expenditures and hydrating nearby combustibles.

Test and Approvals

DnV MED-B and UK MER-B Approval

The FIREKILL™ NEPTUN OH-L2 has been tested in accordance with IMO Resolution MSC.265(84) for public space, 5,00 m ceiling height. The FIRE KILLTM NEPTUN OH-L2 can therefore be used for IMO Occupancy classification (1) Control stations, (6) Accommodation space minor fire risk, (7) Accommodation spaces of moderate fire risk, (8) Accommodation spaces of greater fire risk, (9) Sanitary & similar spaces.