12 FLUE RESISTANCE’S
11
Maximiser SE
- Installation
IMPORTANT : The boiler MUST be installed in a vertical
position.
The pressure available at the boiler outlet is sufficient to
overcome the resistance of approximately 40 metres of 100
mm smooth straight flue pipe. However, this pressure will
be significantly reduced dependant upon the type of flue
system used and the number of bends.
The table below provides the individual resistance’s for a
number of pipes and bends available.
The maximum pressure drop allowed in the flue length
is approximately:-
70 Pa for the Maximiser SE42
90 Pa for the Maximiser SE65
Table 4 - Flue Gas Resistance
Pressure drop per component
Pa
Pa
SE42
SE65
SE42
SE65
Straight pipe Ø 80 mm per m
2.2
5.3
Ducts
Straight pipe Ø 90 mm per m
1.8
4.4
Roof duct 80/125 mm
34.0
75.2
Straight pipe Ø 100 mm per m
0.8
1.7
Roof duct 100/150 mm
-
37.0
Straight pipe Ø 110 mm per m
0.3
0.7
Wall duct 80/125 mm
22.0
-
Wall duct 100/150 mm
-
43.3
Air supply system
Concentric pipe
45º bend Ø 80 mm
2.3
5.3
45º bend Ø 80/125 mm
3.7
-
45º bend Ø 90 mm
1.7
4.1
45º bend Ø 100/150 mm
1.8
2.7
45º bend Ø 100 mm
0.7
1.6
90º bend Ø 80/125 mm
6.0
-
45º bend Ø 110 mm
0.2
0.5
90º bend Ø 100/150 mm
2.7
4.5
Straight pipe Ø 80/125 mm per m
4.0
-
90º bend Ø 80 mm
7.2
16.0
Straight pipe Ø 100/150 mm per m
1.8
3.6
90º bend Ø 90 mm
5.4
12.5
90º bend Ø 100 mm
2.2
4.4
Flue gas discharge system
90º bend Ø 110 mm
0.3
0.6
45º bend Ø 80 mm
3.7
8.9
45º bend Ø 90 mm
2.8
6.7
Straight pipe Ø 80 mm per m
1.5
3.6
45º bend Ø 100 mm
0.9
2.0
Straight pipe Ø 90 mm per m
1.3
3.1
45º bend Ø 110 mm
0.4
0.9
Straight pipe Ø 100 mm per m
0.6
1.4
Straight pipe Ø 110 mm per m
0.1
0.2
90º bend Ø 80 mm
11.7
26.6
90º bend Ø 90 mm
9.0
20.0
90º bend Ø 100 mm
3.5
7.2
90º bend Ø 110 mm
0.5
1.1
The above table provides approximate resistance information for the optional flue kits (concentric pipe) and propriety
fittings, available from the flue companies mentioned below.
Purpose designed flue and air systems can be provided with the boiler (concentric systems) at the time of purchase, or can
be purchased from either of the following:
Rite Vent Ltd (0191) 416 1150
Selkirk Manufacturing (01737) 353388
FLUE DESIGNS
Flue designs are calculated against the maximum available resistance using the resistance table above. The examples
following are given as a guide only, therefore a greater number of variations can be obtained.
