How to calculate the exhaust gas volume (m3/h) generated by an oil-water separator

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Let’s take a look at how much exhaust gas is produced at the water discharge point above the oil-water separation tank ? The image shows an oil-water separator. The oil phase in the upper part is toluene, while the water phase is in the lower part. The exhaust outlet at the top has a diameter of DN25. The temperature of the oil-water separator is 40 degrees Celsius, and the external atmospheric pressure is 1 atmosphere. The exhaust pipe is connected to the inlet of the fan; the fan has a volume flow rate of 1264 m3/h and a total pressure of 3597 Pa. At the inlet of the fan, there is a main exhaust pipe with a diameter of DN300, and the pressure loss across this pipe is around 2000 Pa. From there, another exhaust pipe leads to the oil-water separator, with a diameter of DN25. Question: How can the volume of exhaust gas generated by the oil-water separator be calculated in m3/h? Is it calculated based on the pipe diameter DN25 and the wind speed in the vent pipe?