22
6 - COMBUSTION AIR AND VENT PIPING
FIGURE 6-4 Side Wall Concentric Venting
WARNING
• Covering non-metallic vent pipe and fittings with
thermal insulation shall be prohibited.
• Use of cellular core PVC for venting flue gas could
result in death, or serious injury.
• Concentric venting shall be fastened with screws.
Dual flue venting is NOT fastened with screws.
!
FIGURE 6-5 Roof Mount Concentric Venting
2” (50 mm)
X
Min. 8" (181 mm)
Max. 14" (356 mm)
Slope vent pipes
min. 3/4" (2 cm)
for every 3
¹
/
₂
ft.
(1.0m) back to
boiler
Maintain 12"(305mm)
US (18"(457mm)
Canada) clearance
above highest
anticipated snow level
24" (610mm) above
roof or ground
Ground
Anticipated
Snow Line
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 soffit
Maximum Length = L
A B
21’ (6.4 m)
E F
21’ (6.4 m)
L1
L2
L = L1 + L2
Illustration shows examples of maximum equivalent lengths.
Coaxial Elbows - Equivalent length
Elbow
Total Length Reduction
45°
1' 8" (0.5 m)
90°
3' 4" (1.0 m)
B. Coaxial Flue Options
• Standard horizontal termination is suitable only for
horizontal applications.
• Maximum permissible equivalent vent length is 21 ft.
(6.4 m)
• An "in line" elbows in flue system must be taken into
consideration
6.7 Coaxial Venting
A. Venting Instructions
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
PN 240012369, REV A [08/31/2018]
Содержание GMHB227
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