The presented book describes the theoretical foundations of ventilation of public and industrial buildings, gives recommendations for the design and operation of ventilation systems. Information about the equipment is given only to the extent that they are necessary when describing the design features of ventilation and are used in the calculations of ventilation systems. The physical essence of phenomena and processes related to ventilation is described, methods for calculating ventilation systems, recommendations for the selection of equipment are given. It can be useful for engineers involved in the design, installation, adjustment and operation of ventilation systems in residential, public and industrial buildings and structures.