Janus FM-200 Sv Series - Hazard Dimensions; Hazard Integrity

Page: 38
FM-200® OPERATION, DESIGN, & SERVICE MANUAL
Revision F
Document # DOC102
Issued: February 1, 2009
Revised: 11-Nov-2011
40YE
Section 3 System Design
3.1.2 Hazard Dimensions
Once the minimum design concentration is determined, the volume for the protected area must be calculated.
Volume is determined by multiplying the area’s length by its width by its height (Volume = l x w x h).
e space below a raised oor (underoor) must be included in the system design unless it is sealed from
the room above. Separate nozzles are required for the underoor and discharge should occur from both the
room and underoor nozzles simultaneously. All rooms located above a common unsealed underoor must
be protected by simultaneously operated systems to ensure minimum design concentration is reached.
If only the space under the raised oor is to be protected by a total ooding system, and it has openings
between the space above and under the raised oor (including perforated oor tiles) then FM-200® should
not be used, in accordance with NFPA 2001 (2012 edition).
If not shut down or closed automatically, the volume of the self-contained recirculating dampered ventilation
systems ducts and components mounted below the ceiling height of the protected space must be considered
as part of the total hazard volume when determining the quantity of agent.
3.1.3 Hazard Integrity
If a protected hazard is not suciently sealed, agent leakage may occur. Leakage of FM-200® may prevent
the required concentration levels from being reached or maintained for the entire holding period, making
it dicult for the FM-200® to extinguish the source of ignition. When a room opening does exist, adding
more agent within a room to counter leakage may actually increase the rate of loss due to an increase in
pressure created by the additional agent.
Doors should be checked for tightness. Weather stripping, seals, and door sweeps should be installed to
minimize leakage. Any door required to remain open must be closed automatically prior to the discharge of
the FM-200® agent.
Walls should be inspected for openings that could result in agent leakage. Openings or penetrations for
cables or ducts should be permanently sealed. Joints where walls contact oors, other walls, and ceilings
should be caulked or otherwise sealed. Caulking materials should be chosen based upon their elasticity and
re rating.
Ductwork leading into or out of the hazard area must contain dampers with airtight seals.
Shut down is recommended for any recirculating air handling units prior to discharge. Mechanical air
handlers can contribute to agent loss.
Floor drains in the protected space or underoor must have traps with automatic primers or environmentally
acceptable seals to preclude the loss of agent through an open trap.
A room integrity test must be performed to conrm any potential sources of leakage. NFPA 2001 contains
an outline for such testing.
Note: Janus Fire System® Fire Extinguishing Systems are designed, manufactured, installed and UL listed
and FM approved to deliver a designated quantity of FM-200® in a "not to exceed" 10 second discharge
time. e "Duration of Protection (Hold Time)" as referenced in NFPA 2001, 2012 edition is a function
of the hazard enclosure's (room) integrity and not a function (or capability) of the re suppression systems
referenced in this publication.