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Innovative Hearth Products
Superior
DRT/C3000 Series Direct-Vent Gas Fireplaces
TM
Vent section length table
Table 15 will assist calculating how many vent sections are needed for the planned vent configuration. When a vent
section is engaged with another section, its effective length will be 1 1/2" shorter.
Table 14: Vent Section Length
Nominal Section
6
Length (in.)
Net Section Length
4.5
(in.)
Height of Vent
in.
ft
4.5
0.375
1
9
0.75
2
10.5
0.875
0
15
1.25
1
22.5
1.875
0
31.5
2.625
0
34.5
2.875
0
37.5
3.125
1
43.5
3.625
0
45
3.75
0
46.5
3.875
0
51
4.25
1
55.5
4.625
0
57
4.75
0
67.5
5.625
0
69
5.75
0
73.5
6.125
1
79.5
6.625
0
81
6.75
0
91.5
7.625
0
93
7.75
0
97.5
8.125
1
103.5
8.625
0
108
9
1
117
9.75
1
118.5
9.875
1
126
10.5
0
130.5
10.875
1
135
11.25
0
139.5
11.625
0
142.5
11.875
1
144
12
1
154.5
12.875
1
160.5
13.375
0
172.5
14.375
0
177
14.75
1
186
15.5
0
196.5
16.375
0
207
17.25
0
211.5
17.625
1
217.5
18.125
0
229.5
19.125
0
232.5
19.375
0
241.5
20.125
0
246
20.5
1
24
12
24
36
48
10.5
22.5
34.5
46.5
Number of Vent Sections
0
0
0
0
0
0
0
0
1
0
0
0
1
0
0
0
0
1
0
0
3
0
0
0
0
0
1
0
1
1
0
0
2
1
0
0
0
2
0
0
0
0
0
1
0
0
0
1
1
2
0
0
0
1
1
0
0
3
0
0
0
0
2
0
0
0
2
0
1
0
2
0
0
0
1
1
0
2
0
1
0
0
0
2
0
0
0
2
0
0
3
0
0
0
3
0
0
5
0
0
1
0
3
0
0
1
3
0
0
1
3
0
0
6
0
0
0
0
0
3
0
0
4
0
0
0
0
3
1
0
0
3
2
0
0
3
0
0
5
0
0
0
5
0
0
0
0
4
1
0
0
4
0
0
6
0
0
0
6
0
1
0
6
0
0
1
6
0
0
0
0
5
0
0
7
0
0
0
7
0
Nominal Section Length
6
(in.)
Net Section Length (in.)
4.5
Height of Vent
in.
ft
1
252
21
0
2
276
23
0
1
279
23.25
0
2
280.5
23.375
1
1
289.5
24.125
0
3
301.5
25.125
0
1
310.5
25.875
0
3
325.5
27.125
0
3
330
27.5
1
2
345
28.75
0
1
349.5
29.125
1
2
372
31
0
3
379.5
31.625
0
2
418.5
34.875
0
3
465
38.75
0
2
475.5
39.625
0
3
480
40
1
3
492
41
1
2
499.5
41.625
0
3
504
42
1
2
511.5
42.625
0
3
520.5
43.375
0
3
531
44.25
0
4
538.5
44.875
1
6
549
45.75
1
5
558
46.5
0
4
562.5
46.875
1
5
568.5
47.375
0
6
573
47.75
1
3
580.5
48.375
0
5
589.5
49.125
0
4
595.5
49.625
1
5
604.5
50.375
0
5
615
51.25
0
5
625.5
52.125
0
6
631.5
52.625
1
4
637.5
53.125
0
5
651
54.25
0
6
655.5
54.625
1
7
672
56
0
7
678
56.5
1
7
688.5
57.375
1
5
697.5
58.125
0
7
702
58.5
1
8
712.5
59.375
1
720
60
0
900285-00 05/2015
12
24
36
48
10.5
22.5
34.5
46.5
Number of Vent Sections
1
0
7
0
0
0
8
0
0
0
0
6
0
0
8
0
1
0
0
6
0
1
0
6
0
0
9
0
0
0
0
7
0
0
0
7
0
0
10
0
0
0
10
0
0
0
0
8
0
0
11
0
0
0
0
9
0
0
0
10
1
0
0
10
1
0
0
10
0
1
0
10
0
0
1
10
0
0
1
10
0
0
0
11
2
0
1
11
2
2
0
11
0
0
2
11
0
2
1
11
0
0
0
12
0
0
0
12
1
0
0
12
1
0
0
12
0
1
0
12
1
2
2
10
1
1
0
12
0
0
0
13
1
0
0
13
2
0
0
13
0
1
0
13
1
1
0
13
0
0
0
14
0
0
0
14
2
0
0
14
0
1
0
14
1
1
0
14
0
0
0
15
0
0
0
15
1
0
0
15
0
1
0
15
Installation
8
8
6
9
7
7
9
7
8
10
11
8
11
9
10
11
12
12
11
12
11
14
15
14
15
12
13
13
14
13
15
15
13
14
15
15
15
14
15
16
16
17
15
16
17
16
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