A fire suppression system for extinguishing a fire in a protected space, comprising: a plurality of fluid discharge devices disposed in operative association with the protected space; a flow distribution network for directing a two-phase flow of the inert gaseous fluid and liquid fire extinguishing agent to said plurality of fluid discharge devices, the flow distribution network including a first pipe receiving the flow of the inert gaseous fluid and liquid fire extinguishing agent and defining a first flow passage interconnected at a flow splitting tee in fluid communication with a second pipe defining a second flow passage and a third flow passage, the flow splitting tee having an inlet for receiving fluid flow from the first flow passage, a first outlet for discharging a first portion of the received fluid flow to the second flow passage, and a second outlet for discharging a second portion of the received fluid flow to the third flow passage; and characterised in that a liquid fluid flow redistribution device is disposed in the first pipe upstream with respect to fluid flow of the flow splitting tee, in that said liquid fluid flow redistribution device comprises a first perforated plate disposed transversely across the first flow passage upstream with respect to fluid flow of the inlet to the flow splitting tee, and in that the system further comprises an inner tubular liner having an interior passage disposed coaxially within the first pipe and defining an axially extending annular space between the tubular liner and an inner wall of the first pipe, said annular space defining an annular flow passage and the interior passage of the tubular liner defining the first flow passage, said tubular liner having a plurality of openings therein establishing fluid flow communication between the annular flow passage and the first flow passage. a plurality of fluid discharge devices disposed in operative association with the protected space; a flow distribution network for directing a two-phase flow of the inert gaseous fluid and liquid fire extinguishing agent to said plurality of fluid discharge devices, the flow distribution network including a first pipe receiving the flow of the inert gaseous fluid and liquid fire extinguishing agent and defining a first flow passage interconnected at a flow splitting tee in fluid communication with a second pipe defining a second flow passage and a third flow passage, the flow splitting tee having an inlet for receiving fluid flow from the first flow passage, a first outlet for discharging a first portion of the received fluid flow to the second flow passage, and a second outlet for discharging a second portion of the received fluid flow to the third flow passage; and characterised in that a liquid fluid flow redistribution device is disposed in the first pipe upstream with respect to fluid flow of the flow splitting tee, in that said liquid fluid flow redistribution device comprises a first perforated plate disposed transversely across the first flow passage upstream with respect to fluid flow of the inlet to the flow splitting tee, and in that the system further comprises an inner tubular liner having an interior passage disposed coaxially within the first pipe and defining an axially extending annular space between the tubular liner and an inner wall of the first pipe, said annular space defining an annular flow passage and the interior passage of the tubular liner defining the first flow passage, said tubular liner having a plurality of openings therein establishing fluid flow communication between the annular flow passage and the first flow passage.