A ventilation device with reversal of direction of air flow comprising a through compartment, with a reversible air driver provided with its own drive (37, 38) and located in the through compartment on a bearing, formed with a hollow suction - inlet body and a hollow pumping - outlet body with a common rotation axis, each of the driver bodies (9, 10) being provided with a side opening and a frontal through opening, wherein side openings of both bodies are facing opposite directions, whilst axes of the frontal through openings in both bodies are aligned with their common rotation axis, while a radial fan with a constant direction of rotation is located in the hollow pumping - outlet driver body, in the through compartment, wherein the radial fan is connected to a driving element located on a fixed support, whereas the through compartment is divided into three parts in a serial layout (A, B, C), namely an initial part, a middle part and an end part, wherein the reversible air driver is located in the middle part of the through compartment, wherein the initial part and the middle part are divided into two parallel branches formed as a suction duct and a pumping duct, and air treatment devices (20, 22) are located in the suction duct and in the pumping duct of the initial part and an air treatment device is located in the end part of the compartment, characterised in that the reversible air driver is a two part air driver, divided into the suction - inlet body and a separate, pumping - outlet body, each of which is provided with a frontal, through opening surrounded by a ring-shaped protrusion, and a longitudinal partitioning element of the compartment is provided in the middle part with a round, through opening surrounded on both sides with a pair of ring-shaped protrusions, wherein both bodies (9, 10) of the driver are located on both sides of the round opening of the partitioning element, whilst their ring-shaped protrusions are meshed with the pair of ring-shaped protrusions of the partitioning element. a reversible air driver provided with its own drive (37, 38) and located in the through compartment on a bearing, formed with a hollow suction - inlet body and a hollow pumping - outlet body with a common rotation axis, each of the driver bodies (9, 10) being provided with a side opening and a frontal through opening, wherein side openings of both bodies are facing opposite directions, whilst axes of the frontal through openings in both bodies are aligned with their common rotation axis, while a radial fan with a constant direction of rotation is located in the hollow pumping - outlet driver body, in the through compartment, wherein the radial fan is connected to a driving element located on a fixed support, whereas the through compartment is divided into three parts in a serial layout (A, B, C), namely an initial part, a middle part and an end part, wherein the reversible air driver is located in the middle part of the through compartment, wherein the initial part and the middle part are divided into two parallel branches formed as a suction duct and a pumping duct, and air treatment devices (20, 22) are located in the suction duct and in the pumping duct of the initial part and an air treatment device is located in the end part of the compartment, characterised in that the reversible air driver is a two part air driver, divided into the suction - inlet body and a separate, pumping - outlet body, each of which is provided with a frontal, through opening surrounded by a ring-shaped protrusion, and a longitudinal partitioning element of the compartment is provided in the middle part with a round, through opening surrounded on both sides with a pair of ring-shaped protrusions, wherein both bodies (9, 10) of the driver are located on both sides of the round opening of the partitioning element, whilst their ring-shaped protrusions are meshed with the pair of ring-shaped protrusions of the partitioning element.