Retrotec FanTestic Integrity (ISO) - Manual (Page 37)

rev-2014-10-27
Page 37 of 50
©Retrotec Inc. 2012
It would take 341 CFM to cause a 5 Pa pressure change in this building.

“Equivalent Leakage Area at 10 Pa” (EqLA) [cm 2 or sq in]
EqLA is defined as the area of a hole (in units of cm 2 or sq in) in a thin panel that would leak
the same amount of air as the building does at a pressure of 10 Pa. It most closely
approximates physical hole sizes found in buildings - for example, a 2 inch by 3 inch
rectangular opening would measure about 6 square inches of EqLA.

“Maximum allowable leakage at 10 Pa that will maintain xx min hold time”, [sq in or cm 2 ]
The largest EqLA allowed by the specified hold time – any larger will require sealing and the
enclosure will fail the test.

“Lower leakage fraction”, F
The Lower leakage fraction is the ratio between the Lower Leakage Area (LLA) and Total
Enclosure Leakage. Lower leakage fraction can be calculated by dividing the EqLA from the
Lower leaks test by the EqLA from the Total Enclosure Leakage test. Otherwise, it is
defaulted to the most conservative value, 0.5.
3.9 Hold time analysis results Summary
The Results Summary indicates to the user if the Enclosure Integrity Test has passed or failed in
compliance with ISO 14520 (2006 edition).
If your test has failed, you need to seal up enclosure leakages to lower the “Hold time” or
required “Extended discharge rate”, depending on what “Test type” it is.

“Calculated hold time (descending interface)“ [min]
The Hold time for a Descending Interface “Test type”. For an Enclosure Integrity Test to
pass according to ISO 14520, this time must be at least 10 minutes, or greater than the
“Specified hold time” entered in the “Extinguishing Agent Info” section of FanTestic
Integrity. This number can be increased by sealing up leakages in the enclosure. For a
description on Descending Interface type systems, refer to section 3.3.1.