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In May 2006 the international measuring standard ISO 9972 was published. Itreplaces the first edition from the year 1996 and is in large parts identicall with theEN 13829:2000, which in Germany was published as DIN EN 13829 in February2001. In the following the differences of the two standards are confronted in a table,so that the substantial differences are to be recognized easily. Whether the availableISO standard is introduced in the near future also as European standard and the EN13829 will be withdrawn, yet is not to be foreseen today.

Thermography is a helpful means at the visualisation of leakages on the wind and airtightness level. However on the one hand not always the theoretically necessaryphysical boundary conditions are available and on the other hand the constructionprogress not always the make an optimal building preparation possible. In principlealso a low n50-Wert during the air tightness measurement does not give a conclusionabout the wind tightness and about the construction unit qualities.

Building airtightness is not a new topic of interest. Already in the seventies of the lastcentury, intense work was done regarding building airtightness in the Nordiccountries. In the Air Information Review of August 1980 (ref. 1) (figure 1), an articleentitled Build tight ventilate right already very well described the challenges.Also in 1980, the Air Infiltration and Ventilation Centre (AIVC) published a guideentitled Air Infiltration Control in Housing A Guide to International Practice.

A ‘standard’, as a quick look in a dictionary will tell us, is an ambiguous term: whereas technical standards refer to expertly developed and scientifically reasoned yardsticks for a comparative assessment of quality, legal standards refer to rules of law, i.e. regulations for conduct that are obligatory for people subject to this law by virtue of the state’s power to enforce law. Legislation in terms of a legislative act therefore always requires in Germany – as in all democratic, constitutional states – sufficient democratic legitimacy.

The test results of BlowerDoor test and thermographic inspection at a nursing home,an administration building and a sports-hall are presented.The nursing home was revised thermically. The external walls were provided with acompound insulation system. Nevertheless the expected energy savings effect did not arise.

Due to practiced building practice in the past decades the preservation of a sufficientroom air quality usually proved as unproblematic. The necessary air-change wasalready regularly ensured by the so called free ventilation of dwellings, i.e. overexisting building leakages. For this neither purposeful constructional measures norspecial user support was required. Due to newer, more energy efficient buildingmethods, as they are in the meantime also prescribed, this state of affairs howeverfundamentally changed.

The interrelation between requirement and implementation and/or realization of theventilation technique is represented in fig. 9 exemplarily for a building, similar to theexample from DIN 4108 - 6 with and ventilated effective area by 205,6 m2. Therebythe total minimum outside air flow rate in the basic ventilation amounts to qV, ges.= 214m/h and in the ventilation for dampness protection it amounts to qV, FL.

The investigation of the QHA (quality community timber construction anddevelopment, registered association) compare and evaluate by the example of a builtreference house the energetic and economic efficiency of current building servicessystems with dwelling ventilation. As basis serve gas condensing boiler technology,heat pump and pellet plants, combined with dwelling ventilation systems with/withoutheat recovery and solar plants.

What is a pure area? In the case of the production of smallest structures, e.g. in productionof microprocessors, or in the clinical range, e.g. in operating rooms, momentous problemscan arise as a result of impurities in air.The only solution of this problem exists in the relocation of production, or the hygenicallyrelevant ranges of medicine and research into a particle-free environment. Such is madeavailable by so-called pure areas.

Manufacturing and development processes in the electrical industry (microchips), thetechnology for smallest elements with high precision, the medical research and thefood technology as well as operating theatres require laboratories and/or areas withparticularly unsoiled air. The clean-room technology dedicates itself to theprotection of these work areas. A field of application is the avoidance of undesirablehigh concentrations of suspended matters and fine types of dust in air, which canlead to disturbances in the operating procedure and to falsified test results.