Lennox EL180UHE Installation Instructions Manual page 18

Capacity of Type B Double-Wall Vents with Type B Double-Wall Connectors
Height Lateral
H L
(feet) (feet)
0
2
6
4
6
0
2
8
5
8
0
2
10
5
10
0
2
15 5
10
15
0
2
5
20
10
15
20
0
2
5
30 10
15
20
30
NOTE - Single appliance venting configurations with zero lateral lengths are assumed to have no elbows in the vent system. For
all other vent configurations, the vent system is assumed to have two 90° elbows. For each additional 90° elbow or equivalent (for
example two 45° elbows equal one 90° elbow) beyond two, the maximum capacity listed in the venting table should be reduced by
10 percent (0.90 x maximum listed capacity).
Serving a Single Category I Appliance
Vent and Connector Diameter - D (inches)
3 inch
Appliance Input Rating in Thousands of Btu Per Hour
Min Max Min
0 78
13 51
21 49
25 46
0 84
12 57
23 53
28 49
0 88
12 61
23 57
30 51
0 94
11 69
22 65
29 59
35 53
0 97
10 75
21 71
28 64
34 58
48 52
0 100
9 81
21 77
27 70
33 64
56 58
NA NA
TABLE 3
4 inch
Max Min
0 152
18 97 27
30 94 39
36 91 47
0 165
16 109 25
32 103 42
39 98 51
0 175
17 118 23
32 113 41
41 104 54
0 191
15 136 20
30 130 39
40 121 51
48 112 61
0 202
14 149 18
29 143 38
38 133 50
46 124 59
55 116 69
0 213
13 166 14
28 160 36
37 150 48
44 141 57
53 132 66
73 113 88
Page 18
5 inch
Max Min
0 251 0
157 32
153 50
149 59
0 276 0
178 28
171 53
164 64
0 295 0
194 26
187 52
176 67
0 327 0
226 22
219 49
206 64
195 76
0 349 0
250 20
242 47
229 62
217 73
206 84
0 374 0
283 18
275 45
262 59
249 70
237 80
214 104
6 inch
Max
375
232
227
223
415
263
255
247
447
289
280
267
502
339
330
315
301
540
377
367
351
337
322
587
432
421
405
389
374
346