The invention relates to a method and an associated device for producing a meltblown nonwoven, in which a plurality of synthetic filaments is extruded from a tool, which is drawn by means of hot process air and which are deposited on a wire belt to form a meltblown nonwoven, in the area of The filaments are deposited by means of a suction device arranged under the sieve belt, and a suction flow through the sieve belt is supported. In known methods and devices, it is very cumbersome to set an air permeability of the meltblown nonwoven to a desired value, as is often required in filter applications. For this reason, an air permeability of the meltblown fleece is measured by means of an air permeability sensor arranged below or above the meltblown fleece passing by. A setpoint for the air permeability of the meltblown fleece is achieved by means of a control device by automatically adapting the process air and / or the suction flow through the screen belt and / or a distance between the tool and the screen belt.
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