We have several server rooms which have FM 200 systems installed and have done for several years. I have now received a quote for remedial works from a contractor and phew it is large. My questions are as follows: FM 200 is not especially dangerous therefore would an extraction system be needed to vent off the gases if activated - I think not, the atmosphere although uncomfortable is still breathable for most people, should it be allowed to vent off naturally? Would a pressure relief valve be needed due to pressures involved - potential implosion of walls? Any help / advice on any of the above would be greatly appreciated Thanks Steve

Are you sure there's a significant risk and that you really need a fire suppressant? In the early years of server rooms it became normal to fit halon systems but all the data I've seen (some time back I admit) showed that major loss events were almost non-existent, so in many cases the halon systems were removed and not replaced by an alternative. Obviously it's the potential business interruption that needs to be assessed, but by how much would it be lessened if the system is activated? Would the electical fault protection limit signifcant damage anyway? I no longer have access to the data which would provide answers but do suggest you reassess the fire risks before committed to significant expenditure on protection.