I don't think the intent is to measure the pressure drop across the
device. Based on what I've read and what I understand to be the intent of
the minimum standard, if you measure 400 gpm and the system demand is 379, then
you've conducted a full flow test at system demand.
UL does not test the assembly for proper operation after an extended
period of time with no water movement. So, this is a means of exercising
the assembly and showing that the demand flow can make it through.
While not prescribed by 13 or 25, prudent ITM procedures would include
measuring the pressure drop across the device.
Scott Mitchell
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