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FAQ - Häufig gestellte Fragen

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This can be done but it is not mandatory. The choice is left to Member States.

Specifically, the Directive states ...

Sprache: English
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All CEN standards (EN or EN-ISO) and draft standards (prEN or prEN-DIS) can be ordered from the National Standards Body organisation (NSB) (see

Answered by Peter G. Schild, SINTEF Building & Infrastructure
Answered on 16 Dezember 2009
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The reason for this is twofold:

(1) When one uses only one test pressure, then the test results can be expressed with just one number, the “flow coefficient”. This is very simple and ...