Dunkirk DCC-150 - Flexible Vent System

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6 - COMBUSTION AIR AND VENT PIPING
6.9 Flexible Vent System
Flexible Pipe Maximum Vent Lengths
3” [80 mm] Diameter Pipe
125/150 165/205
Natalini
Exhaust 75 ft [22.8m] 50 ft [15.2m]
Intake 50 ft [15.2m] 50 ft [15.2m]
DuraVent
®
Exhaust 82 ft [24.9m] 50 ft [15.2m]
Intake 50 ft [15.2m] 50 ft [15.2m]
Centrotherm
Exhaust 52 ft [15.8m] 50 ft [15.2m]
Intake 50 ft [15.2m] 50 ft [15.2m]
Z-Dens
Exhaust
NA
50 ft [15.2m]
Intake 50 ft [15.2m]
Single Wall Elbows - Equivalent Length
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 straight
runs only. Include rigid pipe and ttings in overall
equivalent length calculations.
• Flexible venting installations use single wall
polypropylene to pass ue gasses to base of chimney,
then exible venting to get them to 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.
• Avoid sharp bends in exible venting.
FIGURE 6-17 - Flexible Venting System
Combustion
Air
Vent Terminal
Flexible Vent
Note
Flexible vent systems shall only be run vertical.
Horizontal runs before adapting to exible must
be rigid pipe.
Rigid Vent
240011947 REV B, [03/31/2018]