A device for producing a channel opening of a channel system, in particular of an air channel system, to be produced in an installation space of a building, in particular in a room, in a floor or in a ceiling, wherein the installation space is delimited by delimiting means, in particular by formwork panels, wherein the interior of the installation space contains the channel system inside, which can be made of pipe sections that are joined together; and wherein the installation space can be filled with a flowable, curable material, whereby the channel system inside the installation space is embedded in the flowable curable material, the device for producing the channel opening comprising: - a housing with a first opening and with a second opening; - the first opening has an opening edge surrounding it, the spatial profile of which is complementary with respect to at least a partial area of a surface of the delimiting means delimiting the installation space, and wherein the opening edge in this partial area can touch the delimiting surface in a surrounding manner; - wherein the second opening is complementary to a pipe end of the channel system and the pipe end can be fixed to the second opening, whereby a fluid connection between the interior of the channel system and the interior of the housing is formed; - a connecting means which can be releasably fixed to the delimiting means and to a wall of the housing in the housing interior in each case, whereby the housing can be releasably connected to the delimiting means, wherein the connecting means has a first end with a first end formation which can be brought into engagement with a complementary formation of the wall of the housing or with a complementary formation on the wall of the housing, and has a second end with a second end formation, which can be brought into engagement with the delimiting surface of the limiting means, and wherein the connecting means is an elongated structure extending between their first end and its second end, wherein the elongated structure is a rod, characterised in that the second end formation is a circular disk-like or plate-like or round lid-like structure, that the outer edge of the disk-like structure is provided with sealing means, that the second end formation is in one piece with the rod or is connected to it in a rotationally fixed manner with respect to the rod axis, and in that the first opening of the housing is a circular opening whose centre lies on a straight line defined by the body axis of the rod and wherein the radius of the first opening corresponds to the radius of the circular disk-like structure of the second end formation. - a housing with a first opening and with a second opening; - the first opening has an opening edge surrounding it, the spatial profile of which is complementary with respect to at least a partial area of a surface of the delimiting means delimiting the installation space, and wherein the opening edge in this partial area can touch the delimiting surface in a surrounding manner; - wherein the second opening is complementary to a pipe end of the channel system and the pipe end can be fixed to the second opening, whereby a fluid connection between the interior of the channel system and the interior of the housing is formed; - a connecting means which can be releasably fixed to the delimiting means and to a wall of the housing in the housing interior in each case, whereby the housing can be releasably connected to the delimiting means, wherein the connecting means has a first end with a first end formation which can be brought into engagement with a complementary formation of the wall of the housing or with a complementary formation on the wall of the housing, and has a second end with a second end formation, which can be brought into engagement with the delimiting surface of the limiting means, and wherein the connecting means is an elongated structure extending between their first end and its second end, wherein the elongated structure is a rod, characterised in that the second end formation is a circular disk-like or plate-like or round lid-like structure, that the outer edge of the disk-like structure is provided with sealing means, that the second end formation is in one piece with the rod or is connected to it in a rotationally fixed manner with respect to the rod axis, and in that the first opening of the housing is a circular opening whose centre lies on a straight line defined by the body axis of the rod and wherein the radius of the first opening corresponds to the radius of the circular disk-like structure of the second end formation.