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Single Boiler Maximum Flue Piping Lengths for Total of Horizontal + 1 Bend + Vertical Sections
Power
Type B
Output
(kW)
65
17
85
7
115
3
150
1
The equivalent bend lengths are also given in the table below.
Equivalent Bend Lengths (m)
Type
100
130
L
L
eq
eq
45
o
2,3
1,8
90
3,7
4,4
o
The flue pipe lengths designated in this section are calculated for positive pressurised systems. The cascade
flue/fresh air piping should be designed and comissioned with reference to the pipe diameters, lengths and
the type and quantity of the boilers used. The design project should have an approval from authorized /
accreditted chimney firms in the country of comissioning.
3.5.2. Flue / Fresh Air Piping Accesories
There are flue pipe system accessories and the planning icons shown below for flue/fresh air piping
equipment and instruments. You can easily make the planning of your piping adaptive to the comissioning
of fresh air suction or flue gas exhaust and etc.
Rev: RINNAI Service manual (English)
Date:14/05/2019
Maximum Pipe Lengths in (m)
(Only Exhaust
or Twin Line)
77
325
75
317
32
151
26
125
150
200
L
L
eq
eq
1,7
3,7
4,0
5,7
325
325
317
317
151
151
125
125
Concentric
100/150
L
eq
1,3
2,2
50
100/150
Concentric
26
25,1
11,2
9,0
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