INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MAE
440 01 4300 02 51
Specifications subject to change without notice.
Table 14 MAXIMUM EQUIVALENT VENT LENGTH - Feet (Meters)
Note: Maximum Equivalent Vent Length (MEVL) does NOT include elbows or terminations
Use Table 15 − DEDUCTIONS FROM MEVL to determine allowable vent length for each application.
Altitude
FT (M)
Unit Size
BTU/Hr
DIRECT VENT (2-PIPE) AND VENTILATED COMBUSTION AIR
Vent Pipe Diameter (in.)
1-1/2 2 2-1/2 3 4
0 to 2000
(0 to 610)
60,000 55 (16.8) 135 (41.1) 235 (71.6) 265 (80.8) NA
2
80,000 35 (10.7) 130 (39.6) 175 (53.3) 235 (71.6) 265 (80.8)
100,000 NA 50 (15.2) 110 (33.5) 235 (71.6) 265 (80.8)
120,000 NA NA 15 (4.6) 100 (30.5) 250 (76.2)
2001 to 3000
(610 to 914)
60,000 45 (13.7) 127 (38.7) 222 (67.7) 250 (76.2) NA
80,000 30 (9.1) 90 (27.4) 165 (50.3) 222 (67.7) 249 (75.9)
100,000 NA 40 (12.2) 104 (31.7) 223 (68.0) 250 (76.2)
120,000 NA NA 11 (3.4) 93 (28.3) 237 (72.2)
3001 to 4000
(914 to 1219)
60,000 40 (12.2) 119 (36.3) 210 (64.0) 235 (71.6) NA
80,000 25 (7.6) 85 (25.9) 155 (47.2) 210 (64.0) 232 (70.7)
100,000 NA 40 (12.2) 98 (29.9) 211 (64.3) 236 (71.9)
120,000 NA NA 8 (2.4) 86 (26.2) 224 (68.3)
4001 to 4500
(1219 to 1370)
60,000 35 (10.7) 115 (35.1) 204 (62.2) 228 (69.5) NA
80,000 23 (7.0) 85 (25.9) 150 (45.7) 202 (61.6) 224 (68.3)
100,000 NA 40 (12.2) 94 (28.7) 205 (62.5) 229 (69.8)
120,000 NA NA NA 83 (25.3) 217 (66.1)
See notes at end of Venting Tables.
See Table 16 for altitudes over 4500 ft (1370m).
Table 15 DEDUCTIONS FROM MAXIMUM EQUIVALENT VENT LENGTH - Feet (Meters)
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)
Figure 60 Elbows Configurations
LONG MEDIUM MITERED
L11F082
Figure 61 Vent Terminal Configurations
L11F083
CONCENTRIC
A13110
STANDARD 2−IN.,
3−IN. OR OPTIONAL
4−IN. TERMINATION
Venting System Length Calculations
The Total Equivalent Vent Length for EACH combustion air or vent pipe equals the length of the venting system, plus the equivalent
length of elbows used in the venting system from Table 15.
Standard vent terminations or factory accessory concentric vent terminations count for zero deduction.
See vent system manufacturer’s data for equivalent lengths of flexible vent pipe or other termination systems. DO NOT ASSUME
that one foot of flexible vent pipe equals one foot of straight PVC/ABS DWV vent pipe.
Compare the Total Equivalent Vent Length to the Maximum Equivalent Vent Lengths in Table 14 and Table 16.
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