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TABLE 7. TECHNICAL DATA VENTING
TYPE B GAS VENT
Multiple Gas Fired Tank-Type Heaters
When venting multiple tank type heaters using Type B vent
pipe, follow the installation diagram (figure 13) and tables
below which give sizing and data based upon NFPA 54/ANSI
Z223. 1992.
MODEL BTR(C)-120
Input: 120,000 Btuh
Draft Hood: 5"
Number of
Heaters
2
3
4
MODEL BTR(C)-154
Input: 154,000 Btuh
Draft Hood: 6"
Numbers of
Heaters
2
3
4
MODEL BTR(C)-180, 197, 198, 199, 200
Input: 180,000, 199,000 Btuh
Draft Hood: 6"
Number of
Heaters
2
3
4
Input Btuh
120,000
120,000
120,000
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
616
Input Btuh
180,000
199,000
180,000
199,000
180,000
199,000
Combined Input in
Thousands of Btuh
360
398
540
597
720
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
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
Total Vent Height (Feet)
6
8
Rise
Vent Connector Diameter (in inches)
1 Ft.
8
8
-
-
2 Ft.
8
8
8
8
3 Ft.
7
7
8
8
Manifold & Common Vent Diameter
10
10
12
10
14
12
14
14
14
14
16
14
19
10
15
20
30
7
6
6
6
6
6
6
6
6
6
6
5
8
7
7
7
10
10
8
8
12
10
10
10
10
15
20
30
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
15
20
30
8
8
8
7
8
8
8
8
7
7
7
7
8
8
7
7
7
7
7
7
7
7
7
7
10
10
8
8
10
10
10
8
12
12
10
10
12
12
12
10
14
12
12
12
14
14
12
12
50
100
6
6
6
5
5
5
6
7
7
7
8
8
50
100
7
7
6
6
6
6
7
7
8
8
1
10
50
100
7
7
8
7
7
7
7
7
6
6
7
6
7
7
8
7
10
8
10
10
10
10
12
10
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