25
6 - COMBUSTION AIR AND VENT PIPING
WT
(X)
(X)
Wall Thickness
WT = Wall Thickness
FIGURE 6-5 Side Wall Coaxial Venting
FIGURE 6-6 Roof Mount Coaxial Venting
FIGURE 6-4 - Coaxial Venting Horizontal or Vertical
2” (50 mm)
X
Min. 8" (181 mm)
Max. 14" (356 mm)
Maintain 12"(305mm)
US (18"(457mm)
Canada) clearance
above highest
anticipated snow level
24" (610mm) above
roof or ground
Ground
Anticipated
Snow Line
Maintain 12"(305mm)
US (18"(457mm)
Canada) clearance
above highest
anticipated snow level
24" (610mm) above
roof or ground
Anticipated
Snow Line
18" Vertical
Clearance to
ventilated soft
6.7 Coaxial Venting Instructions
Maximum equivalent ue lengths for Coaxial venting are:
Coaxial Pipe Maximum Vent Lengths
Boiler Size 125/150 165/205
Vent Size
4"/2"
[100mm/60mm]
5"/3"
[128mm/80mm]
Natalini 32.80 ft [10m] 32.80 ft [10m]
DuraVent
®
27.88 ft [8.5m] 32.80 ft [10m]
Centrotherm 24.60 ft [7.5m] 32.80 ft [10m]
Coaxial Elbows - Equivalent length
4"/2" [100mm/60mm]
45°
1.64 ft. [0.5m]
90°
3.28 ft. [1.0m]
5” / 3” [128mm/80mm]
45°
1.64 ft. [0.5m]
90°
3.28 ft. [1.0m]
NOTE: Coaxial venting can run horizontal or vertical.
• Connect ue elbow to top of boiler and adjust direction of
elbow to desired orientation (rear, right or left).
• Measure distance from outside wall face to elbow, this
dimension will be known as 'X", add distance "Y" + 2"
(50mm) to "X" this is the total dimension of the vents. See
Figure 6.4.
• Mark dimension from above on outer aluminum intake
vent. Measure length of waste material, and transfer
dimension to inner grey ue pipe.
• Remove waste from both vents (ue and air). Verify cut
ends are square and free from burrs. Insert ue 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 coaxial vent
system.
• After installing venting use calibrated analyzer to verify
there is no recirculation of combustion.
• Ensure termination is positioned with slots at the bottom.
FIGURE 6-3 - Coaxial Vertical Exhaust
12" (305mm) Minimum
Separation
Manufacturer
Recommends
Greater Separation
240011947 REV B, [03/31/2018]
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