A technique for crimping multifilament threads involves a device having an injector installation and having a stuffing installation. The injector installation has a conveying duct having a thread inlet. The conveying duct of the injector installation opens into a stuffer chamber of the stuffing installation. The stuffer chamber in an upper chamber portion, between a plurality of wall portions of a chamber wall, has a plurality of slot-shaped air-exhaust openings. The wall portions of the chamber wall, in order to configure the air-exhaust openings, each have one flow edge which is aligned so as to be tangential to a chamber circle.