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Weerstand van concentrische horizontale en verticale doorvoeren.
De beschikbare weerstand van 100 Pa voor de toe- en afvoerleiding dient ver-
minderd te worden met de uit de tabel gevonden weerstand.
Tabel 1
Conc. lengte L Weerstand
[mm] [Pa]
500 0
700 1,5
1000 3
1225 5
1500 6
1750 7,5
1950 9
2160 10
Droge lengte rookgasafvoerleiding aangesloten op concentrische
dak of muurdoorvoer.
Geldt niet voor uitvoering met dubbelwandige afvoerleiding. Vermenigvuldig
de te installeren afvoerlengte ( uiteraard gecorrigeerd met betrekking tot het
aantal bochten ) met de bij de doorvoerlengte L behorende factor Fc uit
tabel 2. Controleer aan de hand van de grafieken 1 t/m 4 ( blz. 11 ) of deze
gecorrigeerde afvoerlengte niet gaat condenseren.
Voorbeeld 2.
Van een concentrische muurdoorvoer is de concentrische lengte L = 1500
mm. De te installeren afvoerlengte is 10 meter, 2 bochten 90º, 80 mm dun-
wandig aluminium. Gevraagd de droge lengte bij 15º C omgevingstemperatuur.
De gecorrigeerde afvoerlengte ten behoeve van de droge lengte
wordt:
Fc * 10,5 m = 2 * 10,5 = 21 meter
Gezien de berekende lengte van 21 meter, blijkt dat uitsluitend een dubbel-
wandige of een geïsoleerde leiding ( grafiek 2, blz. 11 ) hieraan voldoet.
1.
719118
INSTALLEREN
Installatie-instructie Nefit EcomLine VR-toestellen
1-9
Tabel 2 (Droge lengte factor Fc.)
Conc. lengte L Factor
[mm] Fc
500 1,25
700 1,35
1000 1,53
1225 1,75
1500 2,00
1750 2,38
1950 2,70
2160 3,33
14


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