The invention discloses a condenser for a bioreactor exhaust, comprising: an inlet (1) adapted to be fluidically connected to a bioreactor exhaust port (2), a cooling chamber (3; 103) fluidically connected to the inlet and via a filter device (4) to an outlet (5), a cooling conduit (6; 106) in contact with the cooling chamber, a heating conduit (7) in contact with the filter device and a vortex tube (8) arranged to convey a cold gas stream through the cooling conduit and to convey a hot gas stream through the heating conduit.