Navien NCB700-2S Plus 42K Installation & Operation Manual page 52

Condensing combi boiler
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Ø60/100 => Max. length: A+B-(1 x 45°elbow) = 20-1.2=18.8 m
Ø80/125 => Max. length: A+B-(1 x 45°elbow) = 68-1.2=66.8 m
Pipe Diameter
Maximum
(mm)
Length (m)
Ø60/100
20
Ø80/125
68
52
Flue System
B
A
Equivalent
Elbow
Length (m)
45°
1.2
90°
2.4
45°
1.2
90°
2.4
6.2.2 Vertical Coaxial Removal (Type C
Standard Removal System
Ø60/100 => Max. length: A=21 m
Ø80/125 => Max. length: A=70 m
Extended Removal System
B
Ø60/100 => Max. length: A+B-(1 x 45°elbow) = 21-1.2=19.8 m
Ø80/125 => Max. length: A+B-(1 x 45°elbow) = 70-1.2=68.8 m
Pipe Diameter
Maximum
(mm)
Length (m)
Ø60/100
21
Ø80/125
70
)
33
A
A
A
Minimum 350 mm
Equivalent
Elbow
Length (m)
45°
1.2

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