leakage-test pressure: verify the test plan before pressurizing sealing, leakage testing & airside verification duct leakage test pressure how much pressure test class use only the pressure, duration, allowable leakage, equipment range, and sequence stated in the approved project test plan. the wrong test pressure can damage the system or produce meaningless results. project leakage-test specification, approved test plan, equipment instructions what approved test pressure and allowable leakage apply to this exact section, and who is authorizing the test?