Retrotec FanTestic Integrity (ISO) - Manual (Page 42)

rev-2014-10-27
Page 42 of 50
©Retrotec Inc. 2012
When any of the PRV types that provide the same venting area in both the positive and negative
directions are chosen, only the positive venting dataset is used.
4.3 Choose leakage area to use for pressure relief
Once the venting datasets are established, the user must indicate which leakage area to use to relieve
peak pressure. Again, if “no pressure relief vent (PRV)” is chosen as the PRV type, then the Total
Enclosure Leakage extrapolated to 125 Pa will be used for peak pressure relief. Otherwise, the user can
choose to use the “vent only” or “enclosure and vent” values for relief of peak pressure.
If the venting dataset is expressing the leakage of “vent only “and peak pressure is to be relieved using
leakage of “vent only”, then the leakage area from the venting dataset is used directly as the leakage
area for the peak pressure calculations.
If the venting dataset is expressing the leakage of “vent only “and peak pressure is to be relieved using
leakage of the “enclosure and vent”, then the leakage area from the venting dataset is added to the
“Leakage area for enclosure” to create the “enclosure and vent” leakage area for the peak pressure
calculations.