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Voorbeeld 2:
Selecta, open uitvoering, vrije uitmonding, totale lengte 31 m, 4 bochten van 90°.
Volgens Tabel 07 is de maximale weerstandslengte in situatie 3 bij Ø 70 mm: 29 m en
bij Ø 80 mm: 63 m (dus meer dan 40 m). Hiervan moet 2 x 4 m = 8 m worden afge-
trokken. Bij Ø 70 mm kan maar 29 m overbrugd worden, dus kan deze niet toegepast
worden. Bij Ø 80 mm komt de lengte op 63 m – 8 m = 55 m. Dit is meer dan 31 m,
dus Ø 80 mm voldoet.
Voorbeeld 3:
Selecta, gesloten uitvoering, totale lengte 20 m, twee bochten van 90° in zowel lucht-
toevoer als rookgasafvoer.
Volgens Tabel 08, situatie 7, is met rond Ø 90 mm 20 m te overbruggen. Stel dat er
echter 3 bochten van 90° in zowel luchttoevoer als rookgasafvoer verwerkt dienen te
worden, ga dan uit van de waarde vermeld tussen haakjes (dus 53 m) en trek hier 2 x
4 m vanaf (1 x voor de bocht in de luchttoevoer en 1 x voor de bocht in de rookgasaf-
voer). De resterende weerstandslengte wordt dan 45 m. De maximale lengte dient op
20 m begrensd te worden. In dit geval is dit net de te overbruggen lengte, dus Ø 90
mm is toepasbaar.
33


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