High Altitude; Venting Table - Lennox G32V Series Service Literature

No gas pressure adjustment is needed when operating from 0 to 4500 ft. (0 to 8 m). See below for correct manifold pressures for altitudes
greater that 4500 ft. (1372 m) for natural and L.P. gas.
Model No.
G32V−75 natural
G32V−100 natural
G32V−125 natural
G32V−75 L.P.
G32V−100 L.P.
G32V−125 L.P.
Vent Pipe
Maximum Maximum
Equivalent Length
Feet Meters
15 4.6
20 6.1
25 7.6
30 9.1
40 12.2
50 15.2
55 16.8
60 18.3
70 21.3
80 24.4
90 27.4
100 30.5
110 33.5
120 36.6
130 39.6
MINIMUM PIPE LENGTHS FOR FURNACES
VENTING NOTES One 90_elbow is equivalent to 5 feet (1.5 m) of straight vent pipe.
Two 45_ elbows are equal to one 90_ elbow.
One 45_ elbow is equivalent to 2.5 feet (.75 m) of straight vent pipe.
One foot (305 mm) length of 2 in. (51 mm) diameter pipe is equivalent to 8 feet (2.4 m) of 3 in. (76 mm) diameter pipe.
Intake and Exhaust pipes must be the same diameter.
2 inch x 3 inch (51 mm x 76 mm) adaptor is furnished with −100 and −125 furnaces for exhaust pipe connection.
Exhaust pipe must terminate with 1−1/2 inch (38 mm) diameter pipe for furnaces using1−1/2 (38 mm) or 2 inch (51 mm) diameter pipe runs.
Exhaust pipe must terminate with 2 inch (51 mm) diameter pipe for furnaces using 3 inch (76 mm) diameter pipe runs.
HIGH ALTITUDE INFORMATION
0 to 4500 ft. (0 to 1372 m)
above sea level
3.5 (0.88) 3 5 (0 88)
7.5 (0.19)
7.5 (0.19)
INTAKE AND EXHAUST PIPE VENTING TABLE
75,000 Btuh (22.0 kW)
in.
2
2
2
2
2
2
2
3
3
3
3
3
3
3
3
G32V−75 5 feet (1.5 m) with two 90_ elbows of 2 inch (51 mm) diameter pipe. (15 equivalent feet (4.6 m) total).
G32V−100 5 feet (1.5 m) with two 90_ elbows of 2 inch (51 mm) diameter pipe. (15 equivalent feet (4.6 m) total).
G32V−125 5 feet (1.5 m) with two 90_ elbows of 2 inch (51 mm) diameter pipe. (15 equivalent feet (4.6 m) total).
Manifold Absolute Pressure (outlet) in. w.g. (kPa)
4501 to 5500 ft.
(1373 to 1676 m)
above sea level
no adjustment
3 4 (0 85) 3.4 (0.85)
no adjustment
7.3 (0.185)
7.3 (0.185)
Minimum Vent Pipe Diameter Required
100,000 Btuh (29.3 kW)
mm in.
51 2
51 2
51 2
51 3
51 3
51 3
51 3
76 3
76 3
76 3
76 3
76 3
76 3
76 3
76 3
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5501 to 6500 ft.
(1677 to 1981 m) (1982 to 2286 m)
above sea level
3.3 (0.82) 3 3 (0 82)
7.1 (0.180)
7.1 (0.180)
125,000 Btuh (36.6 kW)
mm in.
51 2
51 3
51 3
51 3
51 3
51 3
76 3
76 3
76 3
76 3
76 3
76 3
76 3
76 3
76 − − − −
6501 to 7500 ft.
above sea level
3.2 (0.80) 3 2 (0 80)
7.0 (0.177)
7.0 (0.177)
mm
51
76
76
76
76
76
76
76
76
76
76
76
76
76
− − − −