9
6-563.7
InsTAllATIon - venTIng
figure 9.2 - vertical 2-Pipe vent system for sloped roofs
figure 9.1 - vertical 2-Pipe vent system for flat roofs
12"
X
4.5" Minimum
Minimum Height "H"
Based on Table 9.2
to inlet opening
Vent Outlet
Pipe
Combusion Air
Inlet Pipe
For vent outlet opening
distance above combustion
air intake opening,
refer to Figure 9.1
Roof flashing
required at all
penetrations
through roof
Combustion air intake pipe shown
for model sizes 85 through 260.
For model size 310, pipe is 6"
galvanized or corrosion resistant metal
rise “X”
(in)
➀
minimum “H”
(ft)
➁
Over 0 to 6
1.00
Over 6 to 7
1.25
Over 7 to 8
1.50
Over 8 to 9
2.00
Over 9 to 10
2.50
Over 10 to 11
3.25
Over 11 to 12
4.00
Over 12 to 14
5.00
Over 15 to 16
6.00
Over 16 to 18
7.00
Over 18 to 20
7.50
Over 20 to 21
8.00
➀
Rise X/12 corresponds to the roof pitch
(e.g. X=9 is 9/12 pitch).
➁
Size according to snow depth.
Table 9.2 - minimum Height
from roof to lowest
discharge opening
Combustion Air
Inlet Pipe
Vent Pipe
Combustion Air
Inlet Pipe
Vent Pipe
Combustion Air
Inlet Pipe
Vent Pipe
Combustion Air
Inlet Pipe
Vent Pipe
24" Minimum from adjacent
wall or building to Combustion
Air Inlet Pipe Terminal
24" Minimum from adjacent
wall or building to Combustion
Air Inlet Terminal Opening
Roof flashing
required at all
penetrations
through the roof
Roof flashing
required at all
penetrations
through the roof
Termination Screens
(refer to Note B6)
Termination Screens
(refer to Note B6)
12" Minimum
above roof or snow line
8" Minimum (135-215)
14" Minimum (260)
4.5" Minimum
4.5" Minimum
12" Minimum above
roof or snow line
14" Minimum
4.5" Minimum
4.5" Minimum
model sIzes 55 THrougH 260
model sIze 310