A ventilation group for a livestock or industrial plant having a roof with an upper opening communicating with an external environment, at least one lateral opening being provided in a lateral wall of the plant and communicating with the environment. The group includes a collecting and conveying channel and elements fixing the channel to the roof, so that the channel is arranged below the upper opening. The channel is configured for collecting atmospheric precipitation which falls through the upper opening and for conveying it towards a ground surface. Via at least one air passage an inside of the plant communicates with the upper opening so as to generate an air flow entering the plant through the lateral opening and passing towards the environment through the passage and the upper opening.
