Technical data venting, table 3 – John Wood Commercial Atmospheric Vent - AJWSM User Manual
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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.
TECHNICAL DATA VENTING, TABLE 3
MODEL JWSM71120
Input: 120,000 Btuh Total Vent Height (Feet)
Draft Hood: 5”
6
8
10
15
20
30
50
100
Input Btuh
Rise
Vent Connector Diameter (inches)
120,000
1 Ft.
7
7
7
6
6
6
6
6
120,000
2 Ft.
6
6
6
6
6
6
6
5
123,000
3 Ft.
6
6
6
6
6
5
5
5
Number of Heaters
Combined Input in
Thousands of Btuh
Manifold and Common Vent Diameter (In inches)
2
3
4
240
10
8
8
7
7
7
6
7
360
10
10
10
10
8
8
7
7
480
12
12
12
10
10
10
8
8
MODEL JWSM95199, JWSM76199, & (A)JWSM100199
Input: 199,000 Btuh Total Vent Height (Feet)
Draft Hood: 6”
6
8
10
15
20
30
50
100
Input Btuh
Rise
Vent Connector Diameter (in inches)
199,000
-
-
8
8
8
8
8
7
199,000
8
8
8
8
7
7
7
7
190,000
8
7
7
7
7
7
6
6
197,000
8
7
7
7
7
7
7
6
199,000
8
8
7
7
7
7
7
6
Number of Heaters
Combined Input in
Thousands of Btuh
Manifold & Common Vent Diameter
2
358
10
10
10
10
8
8
7
7
380
12
10
10
10
10
8
7
7
394/398
12
10
10
10
10
8
8
7
3
537
14
12
12
12
10
10
10
8
570
14
12
12
12
10
10
10
10
591/597
14
14
12
12
12
10
10
10
4
716
14
14
14
12
12
12
10
10
760
16
14
14
14
12
12
10
10
788/796
16
14
14
14
12
12
12
10
CREATED BY NEEVIA DOCUSTAMP TRIAL VERSION (WWW.NEEVIA.COM)
CREATED BY NEEVIA DOCUSTAMP TRIAL VERSION (WWW.NEEVIA.COM)