7-14
September 2004
Argonite
®
Engineered Fire Suppression System
38-KFSARG-000
7-13.2
Underfloor Nozzles
The maximum area of coverage for a single nozzle in an underfloor is 35' 5" x 35' 5"
(10.8 m x 10.8 m), or 1,254 ft.
2
(116.5 m
2
), with the same limitations on height and
positioning noted in the preceding paragraphs. The
MINIMUM
height of an underfloor
that may be protected is 12 in. (30.5 cm). The coverage possible in an underfloor is
dependent upon the density of cables, runways, and other equipment that might be
present in the underfloor space. The maximum figures should be used only for
underfloors that will be relatively open. This requires some judgment on the part of
the designer, but in general, if the horizontal line of sight is more than 70% obstructed
in an underfloor, these maximum figures should be reduced by 50%.
In protected hazards with underfloors that are unprotected and not gas tight,
consideration shall be given to having nozzles installed below the floor (simultaneous
discharge) in order to equalize the pressure and achieve the extinguishing
concentration below the floor.
7-13.3
Nozzle Location
The nozzle(s) may be positioned flush with the ceiling or within 7.5 in. (191 mm) of
the ceiling with the design radius covering the required area.
PIPING
CEILING
PIPING
NOZZLE
CEILING
7.50 IN.
(191MM)
NOZZLE
Figure 7-2. Nozzle Location
