59SU5A: Installation, Start-up, Operating and Service Maintenance Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
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NOTE: Maximum Equivalent Vent Length (MEVL) includes standard and concentric vent termination and does NOT include elbows. Use Table 19 -
Deductions from Maximum Equivalent Vent Length to determine allowable vent length for each application.
A13110
NOTES:
1. Use only the smallest diameter pipe possible for venting. Over-sizing may cause flame disturbance or excessive vent terminal icing or freeze-up.
2. NA - Not allowed. Pressure transducer will not close, or flame disturbance may result.
3. Vent sizing for Canadian installations over 4500 ft. (1370 M) above sea level are subject to acceptance by the local authorities having jurisdiction.
4. Size both the combustion air and vent pipe independently, then use the larger size for both pipes.
5. Assume the two 45_ elbows equal one 90_ elbow. Wide radius elbows are desirable and may be required in some cases.
6. Elbow and pipe sections within the furnace casing and at the vent termination should not be included in vent length or elbow count.
7. The minimum pipe length is 5 ft. (2 M) linear feet (meters) for all applications.
8. Use 3-in. (76 mm) diameter vent termination kit for installations requiring 4-in. (102 mm) diameter pipe.
Table 17 – Maximum Allowable Exposed Vent Length in Unconditioned Space - Ft.
Unit Size 40,000 BTUH 60,000 BTUH
Winter
Design
Temp °F
Pipe Dia.
in.
Uninsulated
3/8-in.
Insulation
1/2-in.
Insulation
Uninsulated 3/8-in. Insulation 1/2-in. Insulation
1 ½ 2 2 ½ 1 ½ 2 2 ½ 1 ½ 2 2 ½ 1 ½ 2 2 ½ 3 1 ½ 2 2 ½ 3 1 ½ 2 2 ½ 3
20 20 20 20 20 50 45 20 60 50 20 30 30 25 20 75 65 60 20 85 75 65
0 10 5 5 20 25 20 20 30 25 15 15 10 10 20 40 30 25 20 45 40 30
-20 5 20 15 10 20 20 15 10 5 20 25 20 15 20 30 25 20
-40 15 10 5 15 15 10 5 20 15 15 10 20 20 15 10
Unit Size 80,000 BTUH
Winter
Design
Temp
°F
Pipe Dia.
in.
Uninsulated 3/8-in. Insulation 1/2-in. Insulation
1 ½ 2 2 ½ 3 4 1 ½ 2 2 ½ 3 4 1 ½ 2 2 ½ 3 4
20 15 40 40 35 30 15 50 90 75 65 15 50 70 70 70
0 15 20 15 10 5 15 50 45 35 30 15 50 50 40 35
-20 15 10 5 15 35 30 20 15 15 40 30 25 15
-40 10 5 15 25 20 15 5 15 30 25 20 10
Unit Size 100,000 BTUH
Winter
Design
Temp °F
Pipe Dia.
in.
Uninsulated 3/8-in. Insulation 1/2-in. Insulation
2 2 ½ 3 4 2 2 ½ 3 4 2 2 ½ 3 4
20 20 50 40 35 20 80 95 80 20 80 105 90
0 20 20 15 10 20 55 45 35 20 65 55 45
-20 15 10 5 20 35 30 20 20 45 35 25
-40 10 5 20 25 20 10 20 30 25 15
Table 18 – Maximum Equivalent Vent Length - Ft.
Unit Size 40,000 60,000 80,000 100,000
Altitude
(feet)
Pipe Dia.
(in)
1 ½ 2 2 ½ 1 ½ 2 2 ½ 3 1 ½ 2 2 ½ 3 4 2 2 ½ 3 4
0-2000 40 155 185
20
100 175 200 15 55 130 175 200 20 80 175 200
2001-3000 35 150 175 95 165 185
10
49
125 165 185
15 75
165 185
3001-4000 30 135 160 16 90 155 175 115 155 175
155
175
4001-4500
25
130 155
15
85 150 170 44 110 150
165
10
70 170
4501-5000 125 145 80 145 165 44 110 145 160
65
150 165
5001-5400 20 120 130 75 140 155 41 100 135 150 140 155
Table 19 – Deductions from Maximum Equivalent Vent Length - Ft. (M)
Pipe Diameter (in): 1-1/2 2 2-1/2 3 4
Mitered 90º Elbow 8 (2.4) 8 (2.4) 8 (2.4) 8 (2.4) 8 (2.4)
Medium Radius 90º Elbow 5 (1.5) 5 (1.5) 5 (1.5) 5 (1.5) 5 (1.5)
Long Radius 90º Elbow 3 (0.9) 3 (0.9) 3 (0.9) 3 (0.9) 3 (0.9)
Mitered 45º Elbow 4 (1.2) 4 (1.2) 4 (1.2) 4 (1.2) 4 (1.2)
Medium Radius 45º Elbow 2.5 (0.8) 2.5 (0.8) 2.5 (0.8) 2.5 (0.8) 2.5 (0.8)
Long Radius 45º Elbow 1.5 (0.5) 1.5 (0.5) 1.5 (0.5) 1.5 (0.5) 1.5 (0.5)
Tee 16 (4.9) 16 (4.9) 16 (4.9) 16 (4.9) 16 (4.9)
Concentric Vent Termination NA 0 (0.0) NA 0 (0.0) NA
Standard Vent Termination 0 (0.0) 0 (0.0) 0 (0.0) 0 (0.0) 0 (0.0)
Long
Medium
Mitered
Concentric
Standard 2-in., 3-in., or
optional 4-in. termination.
ELBOW CONFIGURATIONS
VENT TERMINAL CONFIGURATIONS
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