A ventilation outlet for a ventilation installation, including: - a liner intended to be connected to the end of a pipe of a general ventilation system, - a flow rate sensor carried by said outlet and configured to detect at least part of the air flow circulating in the outlet to produce an electrical signal characterizing and quantifying the air flow rate passing through the ventilation outlet, - an electronic control and measuring circuit carried by said outlet and configured to determine the value of the detected air flow rate, by analyzing the electrical signal produced by the flow rate sensor; - a controllable flow rate modulating circuit, carried by said outlet, making it possible, on demand by the control and measuring circuit, to vary the air flow rate through the air circulation conduit of the outlet, - a sensor making it possible to determine a specific ventilation need in the spatial zone where the outlet is installed and providing the measuring and control circuit with the measurements of one or several parameters taking account of said specific ventilation need, a flow rate setpoint value determining the command from the flow rate modulating circuit being defined as a function of the values of the parameters measured by said at least one sensor, - the flow rate sensor, the flow rate modulating circuit, the additional sensor and the electronic measuring and control circuit being powered by an autonomous electrical energy source integrated into the ventilation outlet, characterized in that the air flow rate sensor, the electronic control and measuring circuit, the flow rate modulating circuit and the autonomous electrical energy source are configured to be housed inside the liner. - a liner intended to be connected to the end of a pipe of a general ventilation system, - a flow rate sensor carried by said outlet and configured to detect at least part of the air flow circulating in the outlet to produce an electrical signal characterizing and quantifying the air flow rate passing through the ventilation outlet, - an electronic control and measuring circuit carried by said outlet and configured to determine the value of the detected air flow rate, by analyzing the electrical signal produced by the flow rate sensor; - a controllable flow rate modulating circuit, carried by said outlet, making it possible, on demand by the control and measuring circuit, to vary the air flow rate through the air circulation conduit of the outlet, - a sensor making it possible to determine a specific ventilation need in the spatial zone where the outlet is installed and providing the measuring and control circuit with the measurements of one or several parameters taking account of said specific ventilation need, a flow rate setpoint value determining the command from the flow rate modulating circuit being defined as a function of the values of the parameters measured by said at least one sensor, - the flow rate sensor, the flow rate modulating circuit, the additional sensor and the electronic measuring and control circuit being powered by an autonomous electrical energy source integrated into the ventilation outlet, characterized in that the air flow rate sensor, the electronic control and measuring circuit, the flow rate modulating circuit and the autonomous electrical energy source are configured to be housed inside the liner.