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Explanation: As you suppose vent is usually wind. I think here too.
Propre = own. Probably it's about some wind generating machine or system (fan, plane propeller, wind tunnel, etc.).
In such cases, for example, it might be necessary to distinguish between the effects of the own generated wind and the natural (case of a plane flying normally) or preexisting wind (case of a plane in a wind tunnel where one might study the interaction between both winds).
25 years of instrumentation in the industry
Yves Georges France Local time: 17:53 Native speaker of: French PRO pts in pair: 75