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Direct Vent (Dual Pipe) Piping; Vent/Flue And Combustion Air Pipe Lengths And Diameters - Whirlpool WGFD293 Installation Instructions Manual

93% and 95% 2-stage variable speed gas furnace
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Direct Vent (Dual Pipe) Piping

The inlet air screens provided in the installation instruction packet
are available for the installer to use in the inlet of the combustion
air pipe to prevent animals from building nests in the combustion
air pipe. Installation of screens, while strongly recommended, is
not required and will not affect performance of the furnace.
Direct vent installations require both a combustion air intake 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"
(30.5 cm) above the top of the chimney. The space between the
pipes and the chimney must be closed with a weathertight,
corrosion resistant flashing. Both the combustion air intake and
vent/flue pipe terminations must be in the same atmospheric
pressure zone. See "Termination Locations," or "Concentric Vent
Termination" in this section for specific details on termination
constructions. For details concerning connection of pipes to the
furnace, refer to the "Standard Furnace Connections" or
"Alternate Furnace Connections" in this section.
Vent/Flue and Combustion Air Pipe Terminations
The vent/flue and combustion air pipes may terminate vertically, as through a roof, or horizontally, as through an outside wall.
Upflow
Direct Vent (Dual Pipe) Maximum Allowable Length of Vent/Flue and Combustion Air Intake Pipe—ft (m)
Unit Input
Termination
(Btu)
Style
45,000
Standard
Alternate
70,000
Standard
Alternate
90,000
Standard
Alternate
115,000
Standard
Alternate
Number of Elbows
Pipe—
in. (cm)
1
2
2 or 2¹⁄₂
71 (21.6)
68 (20.7)
(5.12 or 6.4)
2 or 2¹⁄₂
58 (17.7)
55 (16.8)
(5.12 or 6.4)
2 or 2¹⁄₂ (5.12
49 (14.9)
46 (14)
or 6.4)
3 (7.6)
71 (21.6)
68 (20.7)
2 or 2¹⁄₂ (5.12
36 (11)
33 (10.1)
or 6.4)
3 (7.6)
57 (17.4)
54 (16.5)
3 (7.6)
71 (21.6)
68 (20.7)
3 (7.6)
57 (17.4)
54 (16.5)
3 (7.6)
49 (14.9)
46 (14)
3 (7.6)
35 (10.7)
32 (9.8)
Vent/Flue and Combustion Air Pipe
Lengths and Diameters
Refer to the following table for applicable length, elbows and pipe
diameter for construction of the vent/flue and combustion 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 and 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" (1.3 cm) thick closed-cell foam insulation where
required.
3
4
65 (19.8) 62 (18.9) 59 (18)
52 (15.8) 49 (14.9) 46 (14)
43 (13.1) 40 (12.2) 37 (11.3) 34 (10.4) 31 (9.5) 28 (8.5)
65 (19.8) 62 (18.9) 59 (18)
30 (9.2)
27 (8.2)
51 (15.5) 48 (14.6) 45 (13.7) 42 (12.8) 39 (11.9) 36 (11)
65 (19.8) 62 (18.9) 59 (18)
51 (15.5) 48 (14.6) 45 (13.7) 42 (12.8) 39 (11.9) 36 (11)
43 (13.1) 40 (12.2) 37 (11.3) 34 (10.4) 31 (9.5) 28 (8.5)
29 (8.8)
26 (7.9)
5
6
7
56 (17.1) 53 (16.2) 50 (15.2)
43 (13.1) 40 (12.2) 37 (11.3)
56 (17.1) 53 (16.2) 50 (15.2)
24 (7.3) 21(6.4)
18 (5.5) 15 (4.6)
56 (17.1) 53 (16.2) 50 (15.2)
23 (7)
20 (6.1) 17 (5.2) 14 (4.3)
8
17

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