Specifications

Table 12 MAXIMUM EQUIVALENT VENT LENTH - Feet (Meters)
Note: Maximum Equivalent Vent Length (MEVL) does NOT include elbows or terminations
Use Table 14 - DEDUCTIONS FROM MEVL to determine allowable vent length for each application.
DIRECT VENT (2-PIPE) AND VENTILATED COMBUSTION AIR
Altitude Unit Size
FT (i) BTU/Hr
60,000
0 to 2000 80,000
(0 to 610) 100,000
120,000
60,000
2001 to 3000 80,000
(610 to 914) 100,000
120,000
60,000
3001 to 4000 80,000
(914 to 1219) 100,000
120,000
60,000
4001 to 4500 80,000
(1219 to 1370) 100,000
120,000
See notes at end of Venting Tables.
See Table 13 for altitudes over 4500 ft (1370m).
Table 13
Altitude
FT(M)
Vent Pipe Diameter (in.)
1-1/2 2 2-1/2 3 4
55 (16.8) 135 (41.1) 235 (71.6) 265 (80.8)
35 (10.7) 130 (39.6) 175 (53.3) 235 (71.6) 265 (80.8)
50 (15.2) 110 (33.5) 235 (71.6) 265 (80.8)
15 (4.6) 100 (30.5) 250 (76.2)
45 (13.7) 127 (38.7) 222 (67.7) 250 (76.2)
30 (9.1) 90 (27.4) 165 (50.3) 222 (67.7) 249 (75.9)
40 (t 2.2) 104 (31.7) 223 (68.0) 250 (76.2)
11 (3.4) 93 (28.3) 237 (72.2)
40 (12.2) 119 (36.3) 210 (84.0) 235 (71.6)
25 (7.6) 85 (25.9) 155 (47.2) 210 (64.0) 232 (70.7)
40 (t2.2) 98 (29.9) 211 (84.3) 236 (71.9)
8 (2.4) 86 (26.2) 224 (68.3)
35 (10.7) 115 (35.1) 204 (62.2) 228 (69.5)
23 (7.0) 85 (25.9) 150 (45.7) 202 (61.6) 224 (68.3)
40 (12.2) 94 (28.7) 205 (62.5) 229 (69.8)
83 (25.3) 217 (66.1)
MAXIMUM EQUIVALENT VENT LENTH - Feet (Meters)
Note: Maximum Equivalent Vent Length (MEVL) does NOT include elbows or terminations.
Use DEDUCTIONS FROM MEVL - Table 14 to determine allowable vent length for each application.
Note: Vent sizing for Canadian installations over 4500 ft. (1370 M) above sea level are subject to acceptance
by the local authorities having jurisdiction.
DIRECT VENT (2-PIPE) AND VENTILATED COMBUSTION AIR
Unit Size Vent Pipe Diameter
1-1/2 2 2-1/2 3 4
35 (10.7) 111 (33.8) 198 (60.4) 221 (67.4)
23 (7.0) 85 (25.9) 146 (44.5) 195 (59.4) 216 (65.8)
40 (12.2) 91 (27.7) 200 (61.0) 222 (67.7)
80 (24.4) 211 (64.3)
37 (11.3) 103 (31.4) 186 (56.7) 207 (63.1)
22 (6.7) 76 (23.2) 137 (41.8) 183 (55.8) 200 (61.0)
33 (10.1 ) 85 (25.9) 188 (57.3) 208 (63.4)
74 (22.6) 199 (60.7)
35 (10.7) 96 (29.3) 174 (53.0) 194 (59.1)
20 (6.1) 71 (21.6) 120 (36.6) 171 (52.1) 185 (56.4)
31 (9.4) 79 (24.1) 178 (54.3) 195 (59.4)
68 (20.7) 187 (57.0)
32 (9.8) 89 (27.1) 163 (49.7) 181 (55.2)
18 (5.5) 66 (20.1) 120 (36.6) 159 (48.5) 170 (51.8)
29 (8.8) 73 (22.3) 167 (50.9) 182 (55.5)
62 (18.9) 175 (53.3)
30 (9.1) 82 (25.0) 152 (46.3) 168 (51.2)
17 (5.2) 62 (18.9) 111 (33.8) 148 (45.1) 156 (47.5)
27 (8.2) 67 (20.4) 157 (47.9) 170 (51.8)
56 (17.1 ) 164 (50.0)
27 (8.2) 76 (23.2) 142 (43.3) 156 (47.5)
15 (4.6) 57 (17.4) 103 (31.4) 137 (41.8) 142 (43.3)
24 (7.3) 62 (18.9) 147 (44.8) 157 (47.9)
51 (15.5) 153 (46.6)
60,000
4501 to 5000 80,000
(1370to 152_ 100,000
120,000
60,000
5001 to 6000 80,000
(1524to 1829) 100,000
120,000
60,000
6001 to 7000 80,000
(1829to 2134) 100,000
120,000
60,000
7001 to 8000 80,000
_134to 243_ 100,000
120,000
60,000
8001 to 9000 80,000
_438to 2743) 100,000
120,000
60,000
9001 to 10,000 80,000
_743to 304_ 100,000
120,000
NOTES:
A. 3- and 4-inch vent pipe systems require long radius elbows.
B. Vent sizing for Canadian installations over 4500 ft. (1370 M) above sea level are subject to acceptance by the local authorities having jurisdiction.
C. N/A - Not Allowed; pressure switch wil! not close, or flame disturbance may result..
D. Do not use pipe size greater than those specified in table or incomplete combustion, flame disturbance, or flame sense lockout may occur.
E. Size both the combustion-air and vent pipe independently, then use the larger diameter for both pipes.
R Assume two 45 ° elbows equal one 90 ° elbow. Wide radius elbows are desirable and may be required in some cases.
G. Elbows and pipe sections within the furnace casing and at the vent termination should not be included in vent length or elbow count.
H. The minimum pipe length is 5 ft (1.5 M) for all applications.
I. Use 3-in. (76 mm) diameter concentric vent termination kit for installations requiring 4-in (102 mm) diameter pipe.
46 Specificati ..... bject to change without notice. 440 01 4201 01