JPL Pressure & Temperature Test
JPL tests and publishes positive pressure rating in accordance with ADC Test FD 72-R1.
In the FD 72-R1 pressure and temperature test, the duct core is tested in a 90 degree elbow configuration at 140 degrees F for 164 hours and 180 degrees F for 4 hours at the published rated pressure.
Unfortunately, many flex duct manufacturers publish their positive pressure ratings based only on the UL-181 Standard Pressure Test. The duct is tested at 2.5 times rated pressure for one hour at ambient (room) temperature in a straight configuration.
A few flexible duct manufacturers publish two pressure ratings. The higher rated pressure is per the UL-181 test standard and the second (lower) rated pressure is footnoted as “Recommended”. This methodology is the same as a weatherman saying todays high will either be 40 or 70 degrees.
JPL pressure ratings are based on conditions the duct will actually be subjected to, i.e. elbowed (bent) and at elevated temperatures, for extended periods of time. When comparing or specifying flexible duct pressures and temperatures, be sure the data was formulated using ADC FD 72-R1 test methods.
JPL pressure testing is ongoing. All 4 of JPL’s facilities randomly test 3 different core diameters every month. A total of 144 QC pressure tests are conducted annually to verify adherence to ADC FD 72-R1.