Supply air terminal device for a ventilation duct network, comprising a flexible bag ( 20 ) of filter material, which with the neck ( 21 ) thereof is releasably mounted on a pipe socket ( 1 ), which forms an end portion of a supply air pipe ( 2 ), which belongs to the ventilation duct network and which mouths into the room ( 10 ), the free end part ( 11 ) of the pipe socket being flanged half a turn inward for the formation of a ring-shaped pocket ( 12 ), and that the neck ( 21 ) of the bag ( 20 ) has an outward, around 180° flanged edge part ( 22 ), which is carried by a resiliently elastic tubular element, which has a shape memory to the pipe shape thereof, in which it can be received in the pocket ( 12 ) of the pipe socket.
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