Modine Manufacturing PTC Installation And Service Manual page 9

InsTAllATIon - venTIng
figure 9.1 - vertical 2-Pipe vent system for flat roofs
Termination Screens
(refer to Note B6)
Vent Pipe
Termination Screens
(refer to Note B6)
Vent Pipe
figure 9.2 - vertical 2-Pipe vent system for sloped roofs
For vent outlet opening
distance above combustion
air intake opening,
refer to Figure 9.1
X
12"
model sIzes 55 THrougH 260
24" Minimum from adjacent
wall or building to Combustion
4.5" Minimum 4.5" Minimum
8" Minimum (135-215)
14" Minimum (260)
12" Minimum
above roof or snow line
Combustion Air
Vent Pipe
Inlet Pipe
model sIze 310
24" Minimum from adjacent
wall or building to Combustion
Air Inlet Terminal Opening
4.5" Minimum
4.5" Minimum
14" Minimum
12" Minimum above
roof or snow line
Combustion Air
Inlet Pipe
Vent Pipe
4.5" Minimum
Roof flashing
required at all
penetrations
through roof
Minimum Height "H"
Based on Table 9.2
Vent Outlet Combusion Air
Pipe Inlet Pipe
Air Inlet Pipe Terminal
Roof flashing
required at all
penetrations
through the roof
Combustion Air
Inlet Pipe
Roof flashing
required at all
penetrations
through the roof
Combustion Air
Inlet Pipe
Combustion air intake pipe shown
for model sizes 85 through 260.
For model size 310, pipe is 6"
galvanized or corrosion resistant metal
to inlet opening
6-563.7
Table 9.2 - minimum Height
from roof to lowest
discharge opening
rise "X" minimum "H"
(in) ➀ (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 R ise X/12 corresponds to the roof pitch
(e.g. X=9 is 9/12 pitch).
➁ Size according to snow depth.
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