24
FIGURE 6-4 - Steel Strapping or Equivalent
6 - COMBUSTION AIR AND VENT PIPING
•
Remove waste from both vents (flue and air). Verify cut
ends are square and free from burrs. Insert flue back into
intake air vent and pass them through hole in wall.
• Check all measurements before cutting. Clearance to
combustible materials is zero when using concentric vent
system.
• After installing venting use calibrated analyzer to verify
there is no recirculation of combustion.
• Ensure minimum downward slope of 2 in (50mm ) for
every 3 ft (1.0m) of flue length toward the boiler.
• Ensure termination is positioned with slots at the bottom.
B.
Concentric Vent Support
• All venting must be supported every 4 ft (1.3 m) using
steel strapping or equivalent. See Figure 6-4.
C.
Flue Options
• Standard horizontal termination is suitable only for
horizontal applications.
•
Maximum permissible equivalent flue lengths are:
• Concentric venting = 21 ft (6.4 m)
•
Any "in line" elbows in flue system must be taken into
consideration.
Elbow
Total Length Reduction
45°
1' 8" (0.5 m)
90°
3'4" (1.0 m)
The first elbow in horizontal run is NOT included in any
equivalent length calculations
• Illustrations show examples of maximum equivalent
lengths. See Figure 6-5.
P/N 240011654, Rev. C [06/08/2017]
