low pressure watermist nozzle


FIREKILL OH-VSO FM Approved Automatic pendent nozzle for OH1 applications

Min. water pressure

8 bar ≈116 psi

Max. working pressure

16 bar ≈232 psi

Drop size

DV90 < 300 μm

Water capacity design

140 m2 / 9 Nozzle

Kv metric


Flow rate at min pressure

47.3 l/min

Nominal density

2.30 mm/m2


4.50 m x 4.50 m


Aesthetic fire protection

The FIREKILL™ 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™ 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™ system for protection of ordinary hazard OH1 (HC1) is unique as it requires very low water pressures and water flow rates. The system utilized the Automatic Low-Pressure Water Mist Nozzles Model OH-VSO which are patented automatic, fine water spray nozzles. The OH-VSO nozzle create 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

FM Approval

The FIREKILL™ OH-VSO nozzle has been successfully tested and approved to the FM5560 standard for FM HC1 occupancies. This means that the system can be used in most Light Hazards defined in NFPA13 and 750, and Ordinary Hazard 1 defined in EN 14972:2020