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PRODUCT DESIGN
WALL
INSIDE
ELBOW OR
COUPLING
90% Furnace Horizontal Termination (Single Pipe)
12" MINIMUM
90% Furnace Horizontal Termination (Single Pipe)
Above Highest Anticipated Snow Level
In a basement installation, the vent/flue pipe can be run be-
tween joist spaces. If the vent pipe must go below a joist
and then up into the last joist space to penetrate the header,
two 45° elbows should be used to reach the header rather
than two 90° elbows.
Direct Vent (Dual Pipe) Piping (90% Furnaces Only)
Direct vent installations require both a combustion air in-
take and a vent/flue pipe. The pipes may be run horizontally
and exit through the side of the building or run vertically and
exit through the roof of the building. The pipes may be run
through an existing unused chimney; however, they must
extend a minimum of 12 inches above the top of the chim-
ney. The space between the pipes and the chimney must
be closed with a weather tight, corrosion resistant flashing.
Both the combustion air intake and a vent/flue pipe termina-
tions must be in the same atmospheric pressure zone. Re-
fer to Vent/Flue and Combustion Air Pipe - Termination Lo-
cations or Concentric Vent Termination section in this manual
OUTSIDE
TEE
or
ELBOW
TURNED
DOWN
COUPLING
MINIMUM
12"
FROM
12"
WALL
TO GROUND OR
HIGHEST ANTICIPATED
SNOW LEVEL
VENT/FLUE TEE
OR
90° ELBOW TURNED
DOWN
12" MINIMUM ABOVE
HIGHEST ANTICIPATED
SNOW LEVEL
or the installation instructions for specific details on termi-
nation construction.
For details concerning connection of pipes to the furnace,
refer to the Vent/Flue Pipe and Combustion Pipe - Stan-
dard Furnace Connections or Alternate Furnace Connec-
tions section in this manual or the installation instructions.
Vent/Flue and Combustion Air Pipe Lengths (Direct
Vent) and Diameters (90% Furnaces Only)
Refer to the following tables for applicable length, elbows,
and pipe diameter for construction of the vent/flue and com-
bustion air intake pipe systems of a direct vent (dual pipe)
installation. The number of elbows tabulated represents the
number of elbows and/or tees in each (Vent/Flue & Com-
bustion Air Intake) pipe. Elbows and/or tees used in the
terminations must be included when determining the num-
ber of elbows in the piping systems.
If the combustion air intake pipe is to be installed above a
finished ceiling or other area where dripping of condensate
will be objectionable, insulation of the combustion air pipe
may be required. Use 1/2" thick closed cell foam insulation
such as "Armaflex" or "Insultube" where required.
AMS9, ACS9, DMS9, DCS9, GCH9, GMS9, GCS9
Direct Vent (Dual Pipe)
Maximum Allowable Length of Vent/Flue & Combustion
Air Intake Pipe (ft)
Vent/Flue/Air
Unit Input
Intake
(Btu)
Termination
Standard
45,000
Alternate
Standard
70,000
Alternate
Standard
90,000
Alternate
Standard
115,000
Alternate
Standard
115,000
Alternate
1) One 90° elbow should be secured to the combustion air intake
connection.
2) Minimum requirement for each vent pipe is five (5) feet in length and
one elbow/tee.
3) Tee used in the vent/flue termination must be included when deter-
mining the number of elbows in the piping system.
4) 3" diameter pipe can be used in place of 2" diameter pipe.
5) Increased Clearance Configurations using (2) 45 deg. Long Sweep
elbows should be considered equivalent to one 90 deg. elbow.
Vent/Flue and Combustion Air Pipe Lengths and Diam-
eters (95% Furnaces Only)
Refer to the following table for applicable length, elbows,
and pipe diameter for construction of the vent/flue and com-
bustion air intake pipe systems of a direct vent (dual pipe)
installation. The number of elbows tabulated represents
the number of elbows and/or tees in each (Vent/Flue & Com-
bustion Air Intake) pipe. Elbows and/or tees used in the
terminations must be included when determining the num-
ber of elbows in the piping systems.
Pipe
(1)(2)(3)(5)
Number of Elbows
(4)
Size
(in.)
2
3
4
5
6
2
68
65
62
59
56
2
55
52
49
46
43
2
68
65
62
59
56
2
55
52
49
46
43
2
55
52
49
46
43
2
42
39
36
33
30
2
26
23
20
Not Recommended
2
7
10
Not Recommended
3
88
87
80
76
72
3
74
70
66
62
58
7
8
53
50
40
37
53
50
40
37
40
37
27
24
68
64
54
50
47
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