Method (57) and blow nozzle for sealing the pocket provided with a blow box used in the drying section of the paper machine Abstract], the blow box. Is arranged to maintain a negative pressure zone in the space and / or blown air space between the blow boxes (16) supporting the fabric body (30) to (10) the blow box. In the interface between the region outside the negative pressure zone desired, are provided as a blow nozzle, the sealing element (46) in the blow box towards the wire distance "d" when viewed from the wire and protrude, so as to form a seal between the outer region of the negative pressure zone and the negative pressure zone. The sealing element is connected to the blow box the seal element so that it can be moved from the wire greater distance "D" than a distance "d" by pressing the actuator and / or.
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