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Droge lengte rookgasafvoerleiding aangesloten op concentrische
dakdoorvoer met verlengde rookgasafvoer. ( SFB systeem )
Geldt niet voor uitvoering met dubbelwandige afvoerleiding.
De droge lengte van de rookgasafvoerleiding is afhankelijk van de lengte B en
de concentrische lengte L en andersom.
In grafiek 9 wordt aan de hand van de lengte B en de concentrische lengte
L de correctiefactor Fcb bepaald.
Vermenigvuldig de te installeren afvoerlengte (uiteraard gecorrigeerd met
betrekking tot het aantal bochten) met de correctiefactor Fcb.
Controleer aan de hand van grafieken 1 t/m 4 ( blz. 11 ), of deze gecorrigeer-
de afvoerlengte niet gaat condenseren.
Voorbeeld 4.
Schoorsteenhoogte is 2 meter. Concentrische lengte is 1000 mm.
De te installeren afvoerlengte is 4,5 meter, 2 bochten 90º, 80 mm dunwandig.
Gevraagd de droge afvoerlengte bij 15º C omgevingstemperatuur.
De gecorrigeerde afvoerlengte ten behoeve van de droge lengte wordt:
Fcb * 5 = 2,2 * 5 = 11 meter. Gezien de berekende lengte van 11 meter, blijkt
dat de afvoerleiding enkelwandig ( grafiek 1, blz. 11 ) uitgevoerd kan worden.
1.
719122
Grafiek 9
719123
INSTALLEREN
Installatie-instructie Nefit EcomLine VR-toestellen
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