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TYPE B GAS VENT
Multiple Gas Fired Tank-Type Heaters
When venting mutiple tank type heaters using Type B
vent pipe, follow the installation diagram (figure 8) and
tables below which give sizing and data based upon
NFPA 54/ANSI Z223. 1992.
MODEL 120
Input: 120,00Btuh
Draft Hood: 5"
Number
of Heaters
2
3
4
MODEL 154
Input: 154,000 Btuh
Draft Hood: 6"
Numbers
of Heaters
2
3
4
MODELS 180, 197, 198, 199, 200
Input: 180,000, 190,000, 199,000 Btuh
Draft Hood: 6"
Number of
Heaters
2
3
4
TECHNICAL DATA VENTING, TABLE 3
Input Btuh
120,000
120,000
123,000
Combined Input
in Thousands of Btuh
240
360
480
Input Btuh
154,000
154,000
154,000
Combined Input
in Thousands of Btuh
308
462
618
Input Btuh
180,000
190,000
199,000
180,000
190,000
199,000
179,000
190,000
197,000
199,000
Combined Input
in Thousands of Btuh
358
380
394/398
537
570
591/597
716
760
788/796
Total Vent Height (Feet)
6
8
Rise
Vent Connector Diameter (inches)
1 Ft.
7
7
2 Ft.
6
6
3 Ft.
6
6
Manifold and Common Vent Diameter (In inches)
10
8
10
10
12
12
Total Vent Height (Feet)
6
8
10
Rise
Vent Connector Diameter (in inches)
1 Ft.
8
8
2 Ft.
7
7
3 Ft.
7
7
Manifold and Common Vent Diameter (in inches)
10
10
12
12
14
14
6
8
Rise
Vent Connector Diameter (in inches)
1 Ft.
8
8
-
8
-
-
2 Ft.
8
8
8
8
8
8
3 Ft.
7
7
8
7
8
7
8
8
Manifold & Common Vent Diameter
10
10
12
10
12
10
14
12
14
12
14
14
14
14
16
14
16
14
11
10
15
20
30
50
7
6
6
6
6
6
6
6
6
6
6
5
8
7
7
7
10
10
8
8
12
10
10
10
15
20
30
50
100
7
7
7
7
7
7
7
6
7
6
6
6
10
8
8
7
12
10
10
10
12
12
12
10
10
Total Vent Height (Feet)
10
15
20
30
50
8
8
8
7
8
8
8
8
8
8
8
8
7
7
7
7
8
7
7
7
8
8
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
10
10
8
8
10
10
10
8
10
10
10
8
12
12
10
10
10
12
12
10
10
10
12
12
12
10
10
14
12
12
12
10
14
14
12
12
10
14
14
12
12
12
100
6
6
6
5
5
5
6
7
7
7
8
8
7
7
6
6
6
6
7
7
8
8
10
100
7
7
7
7
8
7
7
7
7
7
7
7
6
6
6
6
7
6
7
6
7
7
7
7
8
7
8
10
10
10
10
10
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