Choose the right tester and orifice plate combination

Enter the maximum allowable leakage and the required test pressure. Then choose the options for length of flex duct and number of 90 degree bends that best matches the configuration from your test rig to the duct system.

Click on the "Calculate My Options" button to determine the maximum system pressure you can obtain for each Tester/Plate combination and which Tester/Plate combinations that will work for your application. To reset values in the table, click on the "Clear Table" button.

Consider Future Needs! Use this program to see if a tester/plate combination will work on future jobs where the leakage may be more or less than the maximum allowable you are considering now. For example, if you're considering a maximum cfm of 150 at a system test pressure of 2 in.wg. now, will the same tester/plate combination work when the pressure is increased to 4 in.wg. and the flow rate is 200 cfm?

 Maximum allowed leakage:
   Tester/Plate Combination
Recommended Minimum CFM
User Entered Maximum Allowed CFM
Maximum Test Pressure (in.wg.)
Will this Tester/Plate Work for you?
Test pressure:
  Cobra with 1-inch
Length of flex duct:
  Cobra with 2-inch
Number of bends:
bends   Cobra with 3-inch
      Cobra with 4-inch
  Lynx with1-inch
  Lynx with 2-inch
  Lynx with 3-inch
    Lynx with 4-inch

Recommended Minimum CFM is the flow rate that causes a 0.4 in.wg. pressure drop across the orifice plate. Therefore, Minimum CFM is limited by the orifice plate used, not the tester. We have limited the smallest pressure drop across the orifice plate to 0.4 in.wg.

Maximum Test Pressure is the maximum pressure the tester/plate combination can obtain at the user entered flow rate (cfm), taking into account the inline losses due to user-entered straight run of flexible duct and number of 90 degree bends.

For a value in the column titled "Will this Tester/Plate Work for you?" to display "YES", the following conditions must exist: (1) the user-entered maximum allowed leakage must be greater than our recommended minimum cfm, and (2) the user-entered test pressure must be less than the calculated maximum test pressure.

We assume no liability for use of this program. We have made every effort available to make sure this program calculates correctly. Data used in this program was derived from laboratory testing using ORIFLOW LLC equipment. Actual results will vary depending on line voltage, the condition and capacity of your equipment, and actual inline losses.  Calculations for inline losses assume ORIFLOW flexible duct is used. Using hard pipe without elbows will increase the capacity of your tester (to see how much, enter 0 for both "length of flex duct" and "number of bends".