PRODUCT DESIGN
45
between the vent pipe and the chimney must be closed with
a weather-tight, corrosion-resistant flashing. For details con-
cerning connection of the vent/flue pipe to the furnace, refer
to
Vent/Flue Pipe and Combustion Air Pipe - Standard Fur-
nace Connections or Alternate Furnace Connections
sec-
tion in this manual or the installation instructions for specific
details. Refer to the following
Non-Direct Vent (Single Pipe)
Piping - Vent/Flue Pipe Terminations
section in this manual
or the installation instructions for specific details on termi-
nation construction.
Although
non-direct
vent
installations do not require a com-
bustion air intake
pipe
, a minimum of one 90° elbow must
be attached to the furnace’s combustion air intake
if
, an
upright installation uses the standard intake location, or a
horizontal installation uses the alternate air intake location.
This elbow will guard against inadvertent blockage of the air
intake.
NOTE:
Alternate combustion fresh air inlet location on the
right hand panel side of 90% furance models was
discontinued since November 2005).
Vent/Flue Pipe Lengths (Non-Direct Vent) and Diam-
eters (90% Furnaces Only)
Refer to the following tables for applicable length, elbows,
and pipe diameter for construction of the vent/flue pipe sys-
tem of a non-direct vent installation. In addition to the vent/
flue pipe, a single 90° elbow must be secured to the com-
bustion air intake to prevent inadvertent blockage. The tee
or elbows used in the vent/flue termination must be included
when determining the number of elbows in the piping sys-
tem.
AMS9, ACS9, DMS9, DCS9, GMS9, GCH9, GCS9
Pipe
Size
(4)
(inc.)
2
3
4
5
6
7
8
45,000
2
68
65
62
59
56
53
50
70,000
2
68
65
62
59
56
53
50
90,000
2
60
57
55
52
50
47
45
2
25
22
20
17
15
12
10
3
58
55
52
49
46
43
40
Non-Dire ct V e nt (Single Pipe )
Maximum A llow able Length of V ent/Flue Pipe (f t)
(1) (2)
Number of Elbow s
(3) (5)
Unit Input
(BTU)
115,000
1) One 90° elbow should be secured to the combustion air intake con-
nection.
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.
GKS9
Pipe
Size
(4)
(in.)
2
3
4
5
6
7
8
045_3
2
68
65
62
59
56
53
50
2
36
33
30
27
24
21
18
3
68
65
62
59
56
53
50
070_4
2
55
52
49
46
43
40
37
2
37
34
31
28
25
22
19
3
68
65
62
59
56
53
50
2
39
36
33
30
27
24
21
3
68
65
62
59
56
53
50
115_5
3
68
65
62
59
56
53
50
Non-Direct Vent (Single Pipe)
Maximum Allowable Length of Vent/Flue Pipe (ft)
(1) (2)
090_5
Number of Elbows
(3) (5)
Models
(kBTU_Tons)
070_3
090_4
AMH95, GMH95, AMS95, GMS95
Pipe
Size
(4)
(inc.)
2
3
4
5
6
7
8
045_3
2
68
65
62
59
56
53
50
070_3
2
68
65
62
59
56
53
50
070_4
2
46
43
40
2
16
13
10
3
68
65
62
59
56
53
50
090_5
3
68
65
62
59
56
53
50
115_5
3
68
65
62
59
56
53
50
Non-Dire ct V e nt (Single Pipe )
Maximum A llow able Length of V ent/Flue Pipe (f t)
(1) (2)
Number of Elbow s
(3) (5)
Models
(kBtu_Tons
)
090_4
Not Recommended
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) Tees and/or elbows used in the vent/flue termination must be in-
cluded when determining the number of elbows in the piping sys-
tem.
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 non-direct vent (single
pipe) installation. The number of elbows tabulated repre-
sents the number of elbows and/or tees in each (Vent/Flue
& Combustion Air Intake) pipe. Elbows and/or tees used in
the terminations must be included when determining the
number 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.