SBN71-120 thru 85-390, SBD30-150/199 TANK TYPE COMMERCIAL
GAS WATER HEATER SERVICE HANDBOOK
VENT TABLES FOR CATEGORY I - TYPE B GAS VENT
Multiple Gas Fired Tank-Type Heaters
When venting multiple Category I tank type heaters using Type B vent pipe, follow the installation tables below which give sizing and data based upon NFPA 54/ANSI
Model: SBN 71-120
Input:120,000 Btu/hr. |
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| Total Vent Height (feet) |
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Vent Connector Size: 5” |
| 6 | 8 |
| 10 | 15 | 20 | 30 | 50 | 100 | |
| Input Btu/hr | Rise | Vent Connector Diameter (inches) | ||||||||
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| 120,000 | 1' | 6 | 6 |
| 5 | 5 | 5 | 5 | 5 | 5 |
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| 120,000 | 2' | 5 | 5 |
| 5 | 5 | 5 | 5 | 5 | 5 |
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| 120,000 | 3' | 5 | 5 |
| 5 | 5 | 5 | 5 | 5 | 5 |
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No. of Units | Combined Input (Btu/hr x 1,000) | Combined Vent/Manifold Diameter | |||||||||
2 | 240,000 |
| 7 | 7 |
| 6 | 6 | 6 | 6 | 6 | 6 |
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3 | 360,000 |
| 8 | 8 |
| 7 | 7 | 7 | 6 | 6 | 6 |
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4 | 480,000 |
| 9 | 9 |
| 9 | 8 | 8 | 7 | 7 | 6 |
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Model: SBN 154; SBD30-150
Input:150,000/154,000 Btu/hr. |
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Vent Connector Size: 6” |
| 6 | 8 |
| 10 | 15 | 20 | 30 | 50 | 100 | |
| Input Btu/hr | Rise | Vent Connector Diameter (inches) | ||||||||
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| 150,000/154,000 | 1' | 6 | 6 |
| 6 | 6 | 6 | 6 | 6 | 6 |
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| 150,000/154,000 | 2' | 6 | 6 |
| 6 | 6 | 6 | 6 | 6 | 6 |
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| 150,000/154,000 | 3' | 6 | 6 |
| 6 | 6 | 6 | 6 | 6 | 6 |
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No. of Units | Combined Input (Btu/hr x 1,000) | Combined Vent/Manifold Diameter | |||||||||
2 | 300,000/ 308,000 |
| 7 | 7 |
| 6 | 6 | 6 | 6 | 6 | 6 |
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3 | 450,000/ 462,000 |
| 8 | 8 |
| 7 | 7 | 7 | 6 | 6 | 6 |
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4 | 600,000/ 616,000 |
| 9 | 9 |
| 9 | 8 | 8 | 7 | 7 | 6 |
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State Water Heaters | 13 | Technical Training Department |
Ashland City, Tennessee © 2007 |
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