Ventilated facade is a contemporary facade system that is popular due to its energy efficiency. There are different configurations of the façade systems, among other things, various spacing between rustication joints. Cold air penetrates through them, thereby, influences air circulation. In this paper, theoretical estimate of air flow data is carried out by applying Boussinesq's hydrostatic model. Research of an impact of rustication joints interval on air flow data via physical simulation is performed for different façade configurations. Based on the results obtained, the most optimal solution is the design of a ventilated facade without rustication joints, or with the largest joints interval value.