Page 6
INTAKE and EXHAUST PIPE VENTING TABLE
Vent Pipe
Minimum Vent Pipe Diameter Required
Maximum
Equivalent Length
50,000 Btuh (14.7 kW) 75,000 Btuh (22.0 kW) 100,000 Btuh (29.3 kW) 125,000 Btuh (36.6 kW)
Feet Meters in. mm in. mm in. mm in. mm
15 4.6 1Ć1/2 38 2 51 2 51 2 51
20 6.1 2 51 2 51 2 51 3 76
25 7.6 2 51 2 51 2 51 3 76
30 9.1 2 51 2 51 3 51 3 76
40 12.2 2 51 2 51 3 51 3 76
50 15.2 2 51 2 51 3 51 3 76
55 16.8 2 51 2 51 3 76 3 76
60 18.3 3 76 3 76 3 76 3 76
70 21.3 3 76 3 76 3 76 3 76
80 24.4 3 76 3 76 3 76 3 76
90 27.4 3 76 3 76 3 76 3 76
100 30.5 3 76 3 76 3 76 3 76
110 33.5 3 76 3 76 3 76 3 76
120 36.6 3 76 3 76 3 76 3 76
130 39.6 3 76 3 76 3 76 Ć Ć Ć Ć Ć Ć Ć Ć
MINIMUM PIPE LENGTHS FOR FURNACES Ċ G26Ć50 Ċ 5 feet (1.5 m) with two 90 elbows of 1Ć1/2 inch (38 mm) diameter pipe. (15 equivalent feet (4.6 m) total).
G26Ć75 Ċ 5 feet (1.5 m) with two 90 elbows of 2 inch (51 mm) diameter pipe. (15 equivalent feet (4.6 m) total).
G26Ć100 Ċ 5 feet (1.5 m) with two 90 elbows of 2 inch (51 mm) diameter pipe. (15 equivalent feet (4.6 m) total).
G26Ć125 Ċ 5 feet (1.5 m) with two 90 elbows of 2 inch (51 mm) diameter pipe. (15 equivalent feet (4.6 m) total).
VENTING NOTES Ċ One 90elbow 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 Ć100 and Ć125 furnaces for exhaust pipe connection.
Exhaust pipe must terminate with 1Ć1/2 inch (38 mm) diameter pipe for furnaces using1Ć1/2 (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.
See pages 10 thru 12 for Termination Kits available.
GAS PIPE CAPACITY - FT
3
/HR (kL/HR)
Nominal Internal
Length of Pipe-Feet(m)
Iron Pipe Size
-Inches(mm)
Diameter
-Inches(mm)
10
(3.048)
20
(6.096)
30
(9.144)
40
(12.192)
50
(15.240)
60
(18.288)
70
(21.336)
80
(24.384)
90
(27.432)
100
(30.480)
1/4
(6.35)
.364
(9.246)
43
(1.13)
29
(.82)
24
(.68)
20
(.57)
18
(.51)
16
(.45)
15
(.42)
14
(.40)
13
(.37)
12
(.34)
3/8
(9.53)
.493
(12.522)
95
(2.69)
65
(1.84)
52
(1.47)
45
(1.27)
40
(1.13)
36
(1.02)
33
(.73)
31
(.88)
29
(.82)
27
(.76)
1/2
(12.7)
.622
(17.799)
175
(4.96)
120
(3.40)
97
(2.75)
82
(2.32)
73
(2.07)
66
(1.87)
61
(1.73)
57
(1.61)
53
(1.50)
50
(1.42)
3/4
(19.05)
.824
(20.930)
360
(10.19)
250
(7.08)
200
(5.66)
170
(4.81)
151
(4.28)
138
(3.91)
125
(3.54)
118
(3.34)
110
(3.11)
103
(2.92)
1
(25.4)
1.049
(26.645)
680
(19.25)
465
(13.17)
375
(10.62)
320
(9.06)
285
(8.07)
260
(7.36)
240
(6.80)
220
(6.23)
205
(5.80)
195
(5.52)
1-1/4
(31.75)
1.380
(35.052)
1400
(39.64)
950
(26.90)
770
(21.80)
660
(18.69)
580
(16.42)
530
(15.01)
490
(13.87)
460
(13.03)
430
(12.18)
400
(11.33)
1-1/2
(38.1)
1.610
(40.894)
2100
(59.46)
460
(41.34)
1180
(33.41)
990
(28.03)
900
(25.48)
810
(22.94)
750
(21.24)
690
(19.54)
650
(18.41)
620
(17.56)
2
(50.8)
2.067
(52.502)
3950
(111.85)
2750
(77.87)
2200
(62.30)
1900
(53.80)
1680
(47.57)
1520
(43.04)
1400
(39.64)
1300
(36.81)
1220
(34.55)
1150
(32.56)
2-1/2
(63.5)
2.469
(67.713)
6300
(178.39)
4350
(123.17)
3520
(99.67)
3000
(84.95)
2650
(75.04)
2400
(67.96)
2250
(63.71)
2050
(58.05)
1950
(55.22)
1850
(52.38)
3
(76.2)
3.068
(77.927)
11000
(311.48)
7700
(218.03)
6250
(176.98)
5300
(150.07)
4750
(134.50)
4300
(121.76)
3900
(110.43)
3700
(104.77)
3450
(97.69)
3250
(92.03)
4
(101.6)
4.026
(102.260)
23000
(651.27)
15800
(447.39)
12800
(362.44)
10900
(308.64)
9700
(274.67)
8800
(249.18)
8100
(229.36)
7500
(212.37)
7200
(203.88)
6700
(189.72)
NOTE-Capacity given in cubic feet of gas per hour (kilo liters of gas per hour) and based on 0.60 specific gravity gas.
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