Abstract: A height-adjustment device for a ceiling-mounted exhaust hood includes a guide bar, a detent pawl and a snapping disposed on the detent pawl. The guide bar includes a plurality of notches and is disposed on a first part of the exhaust hood. The detent pawl is disposed on a second part of the exhaust hood. The first and second parts of the exhaust hood are movable relative to one another. The detent pawl, when moved along a longitudinal axis of the guide bar in a first direction is automatically movable from an unlocked position to a locked position by an interaction of the snapping device with a first actuating device. The detent pawl, when moved in a second direction along the longitudinal axis, is automatically movable from the locked position to the unlocked position by an interaction of the snapping device with a second actuating device.