FIELD: ventilation systems. SUBSTANCE: ventilation system includes ventilation unit mounted on roof and provided with fans for creating air flow and distributing passage for supply of incoming air flow to equal levels of building. To avoid separate distributing passage and separation of space building, operational shaft of building is used as passage for incoming air flow directed downward from fans owing to which ventilating shaft is provided with deflecting devices for admitting part of air flow to each intermediate level of building. EFFECT: enhanced efficiency. 10 cl, 6 dwg
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