Stationary balancing exhaust extractors OBS/P are designed for effective removal of exhaust fumes, emitted by the vehicles exhaust pipes, during the engine tests, adjustment and diagnostics. They are applied in depots, garages, car service stations and workshops. OBS/P can be mounted on a wall or a column. It can work with an extraction fan installed on a wall bracket or on a roof base. Moreover, the extractor can be connected to a main collecting discharge ductwork. Due to the built-in shut-off damper, it is possible to apply a smaller extraction fan, in application where only part of the connected (to the collecting duct) extractors is simultaneously used.