11
Cast Iron Condensing Boilers – Installation Manual
FlexCore Stainless Steel Condensing Boilers – Installation Manual
Figure 2 - Horizontal Air Intake and Venting for a Single Direct Vent System
Figure 3 - Horizontal Air Intake and Venting for Multiple Direct Vent Systems
10 ft
(3.1 m)
WARNING: When running horizontal
combustion air and venting for single or
multiple units, exhaust and combustion air
terminals must be installed on the same
plane (outside wall) in order to prevent
pressure differences due to prevailing
winds. In cold climates, double-wall or
insulated inlet pipe recommended to
prevent condensation.
0
1
2
3
4
5
6
7
8
9
0
5
10
15
20
Horizontal Distance, X
Ve
rt
ic
al
Di
st
an
ce
, Y
2000 & Larger
1201 To 2000
901 To 1200
200 To 900
1000 BTU'S
WARNING: When running horizontal combustion
air and venting for single or multiple units,
exhaust and combustion air terminals must be
installed on the same plane (outside wall) in order
to prevent pressure differences due to prevailing
winds. In cold climates, double-wall or insulated
inlet pipe recommended to prevent condensation.
