27
5.10 (3" /80 mm Only) Flexible Vent System
Single Wall Elbows - Equivalent Length
Vent Dia.
3" [80 mm]
45° bend 0.82 ft [0.25 m]
90° bend 1.64 ft [0.50 m]
• Maximum vent lengths based on equivalent
in overall equivalent length calculations.
• Flexible venting installations use single wall
termination at the top.
• Combustion air is not supplied through masonry
chimney. Combustion air must be from outside
using 3" [80 mm] single wall polypropylene.
• Position boiler to use minimum of rigid single wall
polypropylene venting to the chimney.
• Follow venting manufacturer's instructions on
assembly and clearances to maintain.
•
FIGURE 5-24 - (3" / 80 mm Only) Flexible Venting
System CAN BE USED ON ALL SIZES
Combustion
Air
Vent Terminal
Flexible Vent
Rigid Vent
5 - COMBUSTION AIR AND VENT PIPING
Flexible Pipe Minimum & Maximum Vent
Lengths
3” [80 mm]
Diameter Pipe
100/115/125/150
165/205
Min Max Min Max
Natalini
Exhaust
6 ft
[1.8 m]
75 ft
[22.8 m]
6 ft
[1.8 m]
50 ft
[15.2 m]
Intake
6 ft
[1.8 m]
50 ft
[15.2 m]
6 ft
[1.8 m]
50 ft
[15.2 m]
DuraVent
®
Exhaust
6 ft
[1.8 m]
82 ft
[24.9 m]
6 ft
[1.8 m]
50 ft
[15.2 m]
Intake
6 ft
[1.8 m]
50 ft
[15.2 m]
6 ft
[1.8 m]
50 ft
[15.2 m]
Centrotherm
Exhaust
6 ft
[1.8 m]
52 ft
[15.8 m]
6 ft
[1.8 m]
50 ft
[15.2 m]
Intake
6 ft
[1.8 m]
50 ft
[15.2 m]
6 ft
[1.8 m]
50 ft
[15.2 m]
Z-Dens
Exhaust
NA
6 ft
[1.8 m]
50 ft
[15.2 m]
Intake
Flexible vent systems shall only be run
vertical. Horizontal runs before adapting
Note
240013375 REV A, [07/01/2021]
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