I have been in a lot of data centers and not once has anyone pointed out a 2nd fire suppression system under the raised floor.
Access floor fire protection.
The fire inspector has just asked us what fire suppression system we will have under the raised floor in addition to the fire suppression in the ceiling.
Raised floor fire protection utilizing separate suppression zones for both above floor and sub floor spaces is a common practice in areas where the subfloor contains a significant hazard fuel load.
You must provide a fire protection system below a raised floor and you have three options to pick from.
There is a critical need to protect data reduce equipment damage and facilitate a return to service.
It is available cut to size or in slabs suitable for cutting on site.
Rated for upto 6 hours seals voids upto 600mm high.
Rated for up to 6 hours seals voids up to 600mm high.
Other than the few exceptions introduced in 2013 the requirements are clear.
So whether you agree or disagree these few paragraphs are embedded into nfpa 13 and hence the safest bet would be to assume that they are enforceable by the authorities having jurisdiction ahj unless proven otherwise.
Aim raised access floor fire barrier is made from high density rockwool stone wool slab faced with class o foil.
Safire raised access floor barriers are purpose manufactured from rock fibre material to seal the void between a raised access floor and the floor slab thus preventing the spread of fire and smoke within concealed floor spaces and at junctions between floor and walls.
Nfpa 75 requires an automatic sprinkler system or a gaseous fire extinguishing system to be provided for the protection of the area below a raised floor in an it equipment room or it equipment area where one or more of the following exist.
Safire raised access floor barriers are purpose manufactured from rock fibre material to seal the void between a raised access floor and the floor slab thus preventing the spread of fire and smoke within concealed floor spaces and at junctions between floor and walls.