A device for detecting a flow of a first gas in a conduit includes a gas jet interfaced to a side of the conduit. The gas jet emits a jet of gas aimed across the conduit. A fluid port is interfaced to a distal side of the conduit for receiving the jet of gas and a pressure-detecting device is interfaced to the fluid port. In absence of the flow of the first gas within the conduit, the gas jet enters the fluid port and the pressure-detecting device reports a first pressure. In presence of the flow of the gas within the conduit, the gas jet is deflected away from the main port by the flow of the first gas and the pressure-detecting device reports a second pressure, the second pressure being lower than the first pressure.
