Abstract: A demountable wall partition system includes a first and a second demountable partition panel each including a board and having a front surface and a rear surface, and a flange connection element. At least one panel mount bracket is connected to each board and protrudes from the rear surface and includes a first end flange extending in a first flange plane parallel with the rear surface of the board and a second end flange. The panels are arranged spaced apart with the rear surfaces facing each other such that the at least one panel mount bracket of the respective panel form at least one pair of aligned panel mount brackets, wherein said brackets are connected to each other by means of the flange connection element which is connected to the end flanges of the brackets such that the flange connection element is supported by the brackets.

Abstract: A building system includes a building space defined by a structural ceiling and a flooring of a building, and a ceiling system. The ceiling system includes an air permeable suspended ceiling arranged below the structural ceiling, and a plenum space is formed between the suspended ceiling and the structural ceiling and a flooring space is formed between the flooring and the suspended ceiling. A plurality of partition wall sections is arranged in the plenum space extending between the structural ceiling and the suspended ceiling and forms a plurality of plenum modules distributed across the plenum space. Each plenum module includes equipment. The equipment of each plenum module includes a supply air device for delivery of supply air to the associated plenum module for pressurization thereof such that the supply air delivered to the plenum module is supplied to the flooring space through the air permeable suspended ceiling.