Experiments and large eddy simulations are carried out to study the interaction of spherical particles with a turbulent air jet impacting a wall. The context is that of the dynamical air curtains used to separate a contaminated ambiance with passive or inertial particles from a clean ambiance. The jet and particle Reynolds numbers and the Stokes number are respectively equal to Re_j = 13500, 3≤Re_p ≤17 and 0.1≤St≤1.5. The rate of particles that crosses the air jet is analyzed according to the particle size, for two particle injection heights. A non-monotonous passing rate of the particles through the jet with respect to the particle size is observed, probably due to the particles/turbulence interaction.