The method involves supplying fiber suspension stream to an injector (2) and dividing the fiber suspension stream into sub flows/partial flows, where the flows suck air which is to be mixed with the fiber suspension stream in the injector and the air is mixed to the fiber suspension stream. Different amounts of air in the flows are sucked such that an atmospheric load of mixture of air and fiber mass is different at different points of a diffuser (5) of the injector, where the mixture leaks out/exhausts from the diffuser of the injector. An independent claim is also included for an injector comprising tubing sections.
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