15
- Installation & Servicing
INSTALLATION
10
0
10
20
02030
W45
W60
Flue Tube Length (m)
Air Tube Length (m)
ima5452
16
OPEN FLUE KITS
Contents
158662 / 158663
• Boiler adapter + screws (x6)
• Air inlet grille
158769 / 158770
• Terminal
Flue System Part No. Max Flue Ext.
W45 W60
Open flue kit 80/125 suitable 158662 + m 20 13.3
for
W45 & W60 158769 Pa 60 80
Open flue kit 100/150 158663 + m 29
suitable for
W80 158770 Pa 100
17
TWIN PIPE FLUES W45 and W60
Twin pipe flue systems can be created using these kits. The air is drawn in from a
horizontal wall terminal and the flue exhausted through either a vertical roof or
horizontal wall terminal.
The maximum flue extension depends on the ratio of air to flue tube. By fixing
either the air or flue tube length, you can determine how much of the other can be
fitted using the appropriate line from the graph below. An example is marked on
the graph. The example assumes the air tube extension has been fixed at 4m.
From the graph we can determine that the allowable flue tube extension length
would be 17.3m for W45 and 10.6m for W60.
Note: See Frame 19 for elbow equivalent lengths.