The issues of increasing the energy efficiency of buildings and reducing their operating costs are very important today. Researches on this subject show that application of ventilated facades improves energy efficiency of buildings an average by 30%. Now we have a high demand for ventilated facades, which are used as a decorative element or as the additional heat and wind protection in construction technology. Ventilated facades with ventilated air gap are special case of building construction. This construction consist of ventilated air layers which protect heat insulation from different environmental effects and availability of convection motions removes water from the atmosphere, which includes keeping heater in position with low humidity. The aim of this work was to assess the hydraulically optimum ventilation holes in the hinged facades of the buildings and structures. Thus, it was found that for any ventilated facade there is an optimum distance from the screen to the wall which is defined by the height of a crack, conditions of transfer of heat and resistance to the freeconvective flow in the ventilated space.