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. 2006.
Model 500
Input: 500,000 btu/hr
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| Total Vent Height (Feet) |
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Vent connector size: 8 inches | 6 | 8 | 10 |
| 15 | 20 |
| 30 | 50 | 100 | ||
Input (btu/hr) |
| Rise |
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| Vent Connector Diameter (Inches) |
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500,000 |
| 1 Ft. | - | 10 | 10 |
| 10 | 9 |
| 8 | 8 | 7 |
500,000 |
| 2 Ft. | 10 | 10 | 10 |
| 9 | 9 |
| 8 | 8 | 7 |
500,000 |
| 3 Ft. | 10 | 10 | 9 |
| 9 | 9 |
| 8 | 7 | 7 |
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| Multiple Fan Assisted Water Heaters |
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| Total Vent Height (Feet) |
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Number of 500 |
| Combined | 6 | 8 | 10 |
| 15 | 20 |
| 30 | 50 | 100 |
Heaters | Input (btu/hr) |
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| Manifold and Common Vent Diameter (Inches) |
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2 | 1,000,000 | 14 | 14 | 12 |
| 12 | 10 |
| 10 | 9 | 8 | |
3 | 1,500,000 | 16 | 16 | 14 |
| 14 | 14 |
| 12 | 12 | 10 | |
4 | 2,000,000 | 18 | 18 | 16 |
| 16 | 14 |
| 14 | 12 | 12 | |
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| Combination of Multiple Fan Assisted and Natural Draft Water Heaters |
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| Total Vent Height (Feet) |
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Number of 500 |
| Combined | 6 | 8 | 10 |
| 15 | 20 |
| 30 | 50 | 100 |
Heaters | Input (btu/hr) |
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| Manifold and Common Vent Diameter (Inches) |
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2 | 1,000,000 | 16 | 14 | 14 |
| 14 | 12 |
| 12 | 10 | 9 | |
3 | 1,500,000 | 18 | 18 | 16 |
| 16 | 14 |
| 14 | 12 | 10 | |
4 | 2,000,000 | 20 | 20 | 18 |
| 18 | 16 |
| 16 | 14 | 12 | |
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