FIGURE 18
TWO FURNACE VENTING THROUGH WALL
FIGURE 17
TWO FURNACE VENTING THROUGH ROOF
more than two furnaces are to be
vented, there must be at least 4 feet
between the first two furnaces and
the third, etc.
CONNECTING TO
FURNACE
IMPORTANT: Clean and deburr all
pipe cuts. The shavings must not be
allowed to block the exhaust, inlet or
condensate drain pipes.
IMPORTANT: When indoor combus-
tion air is used, the inlet air opening
at the furnace must be protected from
accidental blockage. On downflow
models, install a double elbow in the
top inlet air opening.
UPFLOW MODELS
The exhaust air pipe connection is a
2-in. female PVC pipe fitting extend-
ing through the left side of the fur-
nace top plate. See Figure 19. This
opening has a protective cap which
should be removed just prior to
installing the exhaust pipe. When 2-
in. pipe is used, connect it directly to
this fitting. When 3-in. pipe is used,
connect a 2 to 3-in. coupling to this
fitting with a short piece of 2-in. PVC
pipe.
The inlet combustion air connection
is at the right side of the top plate.
An alternate combustion inlet air con-
nection may be made on the right
side of the jacket. The alternate con-
E
EX
XH
HA
AU
US
ST
T V
VE
EN
NT
T
M
MO
OD
DE
EL
LS
S 0
06
6--0
07
7
N
NO
O V
VE
EN
NT
T R
RE
ED
DU
UC
CT
TIIO
ON
N
R
RE
EQ
QU
UIIR
RE
ED
D..
M
MO
OD
DE
EL
LS
S 0
09
9--1
12
2 T
TO
O B
BE
E
R
RE
ED
DU
UC
CE
ED
D F
FR
RO
OM
M 3
3”” P
PV
VC
C
T
TO
O 2
2”” P
PV
VC
C B
BE
EL
LO
OW
W R
RO
OO
OF
F
L
LIIN
NE
E..
3
3”” M
MIIN
NIIN
NU
UM
M
2
24
4”” M
MA
AX
XIIM
MU
UM
M
nection opening has a plastic cap. A
combustion inlet air connection fitting
is supplied with the furnace and it
must be installed in the furnace by
screwing it into the opening. Make
sure the rubber “O-ring” supplied with
the furnace is used with this fitting.
See Figure 19.
IMPORTANT: When using indoor
combustion air, the furnace air open-
ing must be protected from accidental
blockage. Install a 2-inch 90° elbow
pointing downward on the side or a
double elbow pointing downward in
the top opening.
TWO-PIPE VENTING
CONCENTRIC VENTING
8"
MINIMUM 12" ABOVE AVERAGE
SNOW ACCUMULATION. MAXIMUM
OF 24 IN. ABOVE ROOF.
SEE CONCENTRIC
VENT SECTION
ON PAGE 23
FOR MORE
INFORMATION.
TWO-PIPE VENTING
CONCENTRIC VENTING
8"
MAXIMUM 1"
DISTANCE
FROM WALL
MINIMUM 12"
ABOVE GRADE
6' MINIMUM
10' RECOMMENDED
SEE CONCENTRIC VENT SECTION
ON PAGE 20 FOR MORE INFORMATION.
3
3”” M
MIIN
NIIN
NU
UM
M
2
24
4”” M
MA
AX
XIIM
MU
UM
M
8
8”” M
MIIN
NIIN
NU
UM
M
2
24
4”” M
MA
AX
XIIM
MU
UM
M
8
8”” M
MIIN
NIIN
NU
UM
M
2
24
4”” M
MA
AX
XIIM
MU
UM
M
26
M
MIIN
NIIM
MU
UM
M 1
12
2”” A
AB
BO
OV
VE
E A
AV
VE
ER
RA
AG
GE
E
S
SN
NO
OW
W A
AC
CC
CU
UM
MU
UL
LA
AT
TIIO
ON
N M
MA
AX
XIIM
MU
UM
M
O
OF
F 2
24
4 IIN
N.. A
AB
BO
OV
VE
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RO
OO
OF
F..
IIN
N C
CA
AN
NA
AD
DA
A M
MIIN
NIIM
MU
UM
M 1
18
8”” A
AB
BO
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VE
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R
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F L
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OR
R M
MA
AX
XIIM
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M 2
24
4””
W
WIIT
TH
HO
OU
UT
T A
AD
DD
DIIT
TIIO
ON
NA
AL
L S
SU
UP
PP
PO
OR
RT
T..
6
6‘‘ M
MIIN
NIIM
MU
UM
M,,
1
10
0‘‘ R
RE
EC
CO
OM
MM
ME
EN
ND
DE
ED
D ((U
US
S))
3
3‘‘ M
MIIN
NIIM
MU
UM
M C
CA
AN
NA
AD
DA
A O
ON
NL
LY
Y..
6
6‘‘ M
MIIN
NIIM
MU
UM
M,,
1
10
0‘‘ R
RE
EC
CO
OM
MM
ME
EN
ND
DE
ED
D ((U
US
S))
3
3‘‘ M
MIIN
NIIM
MU
UM
M C
CA
AN
NA
AD
DA
A O
ON
NL
LY
Y..
