This paper describes problems of computational simulation of gas dynamics and thermophysical processes running inside a displacement volume of the air curtain with a cross flow fan. The measurement of flow structure in the form of flow lines, gas pressure, temperature and velocity field at a fan rotation rate ranged from 250 rpm up to 1500 rpm is evaluated due to the computational experiment. The measurement shows that flow structure does not depend on the fan rotation rate and correspond to the experimental date. Velocity profiles are self-similar. Maximum vacuum pressure depending on the impeller rate is evaluated and local temperature maximums correspond the flow jet axis in the air curtain outlet cross section was estimated. Gas temperature in the vortex zone decreased up to 296 K and does not depend on the fan rotation rate that makes it possible to study the air curtain operation using the uncompressed liquid model. The linear relation between fan rotation rate and air capacity injected by a fan was demonstrated and described.