Retrotec FanTestic Integrity (Venting Calculator) - Manual (Page 21)

rev-2014-10-27
Page 21 of 29
©Retrotec Inc. 2012
2.2 Enter extinguishing agent details

“Initial concentration” [% volume]
The initial concentration, as a percent of volume, of agent in the enclosure immediately
after a complete discharge (i.e. the concentration of agent at the beginning of the hold
time). Defaulted to 40% for inert agents and 7% for halocarbon agents. It is used along
with the entered enclosure volume to calculate the agent mass, behind the scenes.

“Discharge time” [s]
The agent’s discharge time in seconds. This value should be obtained from the fire
suppression system design specifications. FanTestic Integrity defaults this value to typical
discharge times: 60 s for inert agents and 10 s for halocarbon agents.
2.2.1 Case of Inert gas extinguishing agents with FSSA:
Uses a leak to volume ratio for the calculation of pressure relief vent area which depends on the chosen
agent, so no peak mass flow needs to be entered. Thus the peak mass flow rate data entry box is not
available in the user interface.
2.2.2 Case of Halocarbon gas extinguishing agents with FSSA and FIA:
Uses a leak to volume ratio for the calculation of pressure relief vent area which depends on the chosen
agent, so no peak mass flow needs to be entered. Thus the peak mass flow rate data entry box is not
available in the user interface.