Of the various sources of noise generated by the climate control system, air rush noise is the most difficult to measure and control. CRF has developed a method of calculation that integrates CFD (Computational Fluid Dynamics) and CAA (Computational Aero-Acoustics) techniques in order to simulate sources of noise caused by lamination of air flow in the distribution ducts and through the facia outlets. The results of the simulation have been validated with experimental data recorded during a specific measurement campaign carried out in the CRF component anechoic NVH cell, obtaining a good level of correlation with fluctuations in acoustic pressure measured on the walls of the duct, in particular in the region of the outlets which accounts for most of the noise perceived in the cab. Further developments of the method will be dedicated to simulating propagation of noise from the outlets to the occupants’ ears.