Based on the analysis of the current industrial overpressure ventilation system the model of it was created. Flow velocities and static pressure measurements were conducted with the Velometer 6000-P series for the current, completely open and closed system configuration. The characteristic curve of the system on the vacuum duct side was determined. Duct air flow velocity profiles were shown for selected measured places; these were not always axially symmetric. The duct central point velocity method was used to calculate an average flow velocity. Volume flow accounted for a simultaneous run of 40 % to 60 %. Despite the fan not providing adequate static pressure the suction ventilation system is indispensable for workshop operation. Some improvement possibilities are given as well as instructions for daily handling of the system. The investigation can provide a solid ground for making inquiries of state of the art industrial ventilation systems that match the carpentry shop demands.
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