Abstract: A method for reducing the amount of immunogenic and/or toxic substances in a building's indoor air. The method is particularly directed at reducing the level of gases generated by certain wood and/or petrochemical based building materials. The method also serves to reduce levels of electromagnetic radiation within the building.

Abstract: A perforated plant vessel that can be assembled by using plastic components including at least one base plate with insertion openings, apertures and lateral wall segments with insertion projections adapted to the insertion openings. The individual parts are well-suited to plants, visually attractive, can be stored easily and can be assembled in various shapes so as to form vessels of different sizes.The plant vessel is particularly suitable for epiphytes in living areas.

Abstract: A screed rail for use in the in situ casting of concrete comprising beams forming upper and lower edges of the rail, which are connected by elements extending therebetween. The elements are spaced along the length of the rail to provide for the passage of concrete reinforcement. For this purpose, the spaced elements may form slots, or a breakable web can close the respective spacings, to be broken as required. In an alternative arrangement a screed rail has an overall cross-section with a lower portion defined by parallel sides extending a major distance from the lower edge of the rail. In use, the rail is mounted in shoes to enable the level of the rail to be accurately set.