This case study demonstrates the capability of Flownex to balance air distribution systems by determining the orifice sizes or damper opening to ensure required flow at certain points in the system. In particular, this example demonstrates the balancing of a central air conditioning distribution system. All the rooms that need to be supplied are similar and a mass flow of 0.02 kg/s is required in each. This case study demonstrates the modeling of a vapour compression refrigeration system using R22 as refrigerant. Both a steady-state and a transient simulation will be considered.