Use the graph or tables below to determine the range of air leakage you can test with the Rhino 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)
500421
1000419
1500418
2000417
2500414
3000412
350049
400046

50 mm Orifice Plate

System Static Pressure (Pa)Min Leakage (L/s)Max Leakage with Rhino Tester (L/s)
5001787
10001778
15001773
20001766
25001757
30001747
35001735
40001726

75 mm Orifice Plate

System Static Pressure (Pa)Min Leakage (L/s)Max Leakage with Rhino Tester (L/s)
50040195
100040180
150040165
200040145
250040130
300040105
35004080
40004060

100 mm Orifice Plate

System Static Pressure (Pa)Min Leakage (L/s)Max Leakage with Rhino Tester (L/s)
50075370
100075340
150075310
200075280
250075245
300075195
350075155
400075105

125 mm Orifice Plate

System Static Pressure (Pa)Min Leakage (L/s)Max Leakage with Rhino Tester (L/s)
500125560
1000125520
1500125480
2000125430
2500125380
3000125310
3500125240
4000125175

150 mm Orifice Plate

System Static Pressure (Pa)Min Leakage (L/s)Max Leakage with Rhino Tester (L/s)
500215730
1000215670
1500215630
2000215560
2500215510
3000215425
3500215310
4000215230

Min Leakage is the recommended minimum flow rate based on a 100 Pa pressure drop across the orifice plate. For example, approximately 40 L/s through the 75 mm orifice plate results in a 100 Pa, so 40 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.