Low noise nozzle assembly for fire suppression system

A nozzle assembly for a fire suppression system discharging a fire extinguishing agent being of a gas form, the nozzle assembly configured to threadedly engage a fitting, the nozzle assembly comprising:

• a) a body having an inlet end having an interior surface having a first diameter configured to receive the fitting, the inlet configured to receive a flow of the fire extinguishing agent from the fire suppression system at an inlet pressure, the inlet end having a flange portion extending radially from a distal end of the body so as to define an abutment surface extending radially and inwardly from the interior surface;
• b) a nozzle portion extending from the body, converging to a nozzle tip and having an interior cavity defining a cylindrical nozzle portion and a conical nozzle portion, wherein the inlet end of the body portion is axially aligned with the nozzle portion along a central axis thereof, the cylindrical nozzle portion being a continuous and uninterrupted wall having a second diameter that is smaller than the first diameter of the inlet, and the conical nozzle portion consisting of a plurality of exit orifices formed in an outer wall of the conical nozzle portion, the plurality of exit orifices are in communication with the cylindrical nozzle portion, for vectoring the flow of fire extinguishing agent exiting therefrom and to reduce a noise level of the nozzle assembly, wherein a axial length along the of the conical nozzle portion is at least double length of the cylindrical nozzle portion;
• and
• c) at least one perforated filter member positioned upstream from the plurality of exit orifices formed in the nozzle portion and seated on the abutment surface and pressed between the fitting and the abutment surface, wherein the at least one perforated filter member has between 20% to 40% open area as defined by a multiplicity of perforations so as to reduce the inlet pressure of the fire extinguishing agent in furtherance of noise level reduction.