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This European Standard specifies methods to calculate basic whole house air flow rates for single family houses and individual apartments up to the size of approximately 1 000 m3. This European Standard may be used for applications such as energy loss calculations, heat load calculations and indoor air quality evaluations. The same basic method apply for these different applications, the input parameter values being selected according to the requirements of the specific application. This standard covers natural, mechanical extract and balanced ventilation systems. Flows due to window opening are also considered, but only as a single sided effect (i.e. no cross ventilation). Therefore, the application is limited mainly to the heating season.