Use the graph or tables below to determine the range of air leakage you can test with the Panther using our standard orifice plates.

Note that the data is based on laboratory tests with short lengths of hard pipe attached to the duct leakage tester. Actual field performance will likely result in reduced performance due to: (1) amount of flexible duct used; (2) number of bends in flexible duct; (3) size of duct system; (4) line voltage. To account for flexible duct and 90 degree bends, use our program that takes these in-line losses into account.

25 mm Orifice Plate

System Static Pressure (Pa)Min Leakage (L/s)Max Leakage with Panther Tester (L/s)
5002.421
10002.419
15002.417
20002.414
25002.412
30002.47

50 mm Orifice Plate

System Static Pressure (Pa)Min Leakage (L/s)Max Leakage with Panther Tester (L/s)
5001290
10001280
15001270
20001260
25001250
30001225

75 mm Orifice Plate

System Static Pressure (Pa)Min Leakage (L/s)Max Leakage with Panther Tester (L/s)
50024185
100024165
150024145
200024125
25002495
30002455

100 mm Orifice Plate

System Static Pressure (Pa)Min Leakage (L/s)Max Leakage with Panther Tester (L/s)
50050385
100050350
150050310
200050260
250050200
300050115

125 mm Orifice Plate

System Static Pressure (Pa)Min Leakage (L/s)Max Leakage with Panther Tester (L/s)
50090625
100090570
150090500
200090415
250090290
300090125

Min Leakage is the recommended minimum flow rate based on a 100 Pa pressure drop across the orifice plate. For example, approximately 24 L/s through the 75 mm orifice plate results in a 100 Pa, so 24 L/s is the recommended minimum leakage. Although it is possible to measure an orifice plate pressure differential lower than 100 Pa, the accuracy of the reading is decreased. Unit of L/s is equal to liters per second.