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Whirlpool WGFM29 Installation Instructions Manual page 17

93% and 95% 2-stage variable-speed gas furnace
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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
Counterflow
Direct Vent (Dual Pipe) Maximum Allowable Length of Vent/Flue and Combustion Air Intake Pipe—ft (m)
Unit Input
Termination
(Btu)
Style
70,000
Standard
Alternate
90,000
Standard
Alternate
NOTES:
Maximum allowable limits listed are individual lengths for inlet
and flue and not a combination.
Elbows and/or tees used in the terminations must be
included when determining the number of elbows in the
piping system.
Number of elbows tabulated are for each vent/flue and
combustion air intake pipe.
Minimum length of each vent/flue and combustion air intake
pipe is 5 ft (1.5 m) and one elbow/tee.
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
49 (14.9)
46 (14)
(5.12 or 6.4)
3 (7.6)
71 (21.6)
68 (20.7)
2 or 2¹⁄₂
36 (11)
33 (10.1)
(5.12 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)
Number of Elbows
Pipe—
in. (cm)
1
2
2 or 2¹⁄₂
49 (14.9)
46 (14)
(5.12 or 6.4)
3 (7.6)
71 (21.6)
68 (20.7)
2 or 2¹⁄₂
36 (11)
33 (10.1)
(5.12 or 6.4)
3 (7.6)
57 (17.4)
54 (16.5)
2 or 2¹⁄₂
61 (18.6)
58 (17.7)
(5.12 or 6.4)
3 (7.6)
71 (21.6)
68 (20.7)
2 or 2¹⁄₂
48 (14.6)
45 (13.7)
(5.12 or 6.4)
3 (7.6)
57 (17.4)
54 (16.5)
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)
3
4
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)
55 (16.8) 52 (15.8) 49 (14.9) 46 (14)
65 (19.8) 62 (18.9) 59 (18)
42 (12.8) 39 (11.9) 36 (11)
51 (15.5) 48 (14.6) 45 (13.7) 42 (12.8) 39 (11.9) 36 (11)
2¹⁄₂" (6.4 cm) or 3" (7.6 cm) diameter pipe can be used in
place of 2" (5.1 cm) diameter pipe.
Increased clearance configurations using two 45º long-sweep
elbows should be considered equivalent to one 90º elbow.
Vertical pipe terminations should be as shown in "Vertical
Terminations (Dual Pipe)" illustration. Refer to "Termination
Locations" in this section for details concerning location
restrictions. The penetrations through the roof must be sealed
tight with the proper flashing such as is used with a plastic
plumbing vent.
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)
5
6
7
56 (17.1) 53 (16.2) 50 (15.2)
24 (7.3) 21(6.4)
18 (5.5) 15 (4.6)
43 (13.1) 40 (12.2)
56 (17.1) 53 (16.2) 50 (15.2)
33 (10.1) 30 (9.2) 27 (8.2)
8
8
17

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