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SBN71-120 thru 85-390, SBD30-150/199 TANK TYPE COMMERCIAL
GAS WATER HEATER SERVICE HANDBOOK
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Model: SBN 85-310
latoT.rh/utB 000,013:tupnI Vent Height (feet)
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Input Btu/hr Rise Vent Connector Diameter (inches)
310,000 1' 9 8 8 8 7 7 6 6
310,000 2' 8 8 8 7 7 7 6 6
310,000 3' 8 8 8 7 7 7 6 6
No. of Units Combined Input (Btu/hr x 1,000) Combined Vent/Manifold Diameter
2 620,000 10 10 9 9 8 8 7 7
3 930,000 14 12 12 12 10 9 9 8
4 1,240,000 14 14 14 12 12 12 10 9
VENT TABLES FOR CATEGORY I - TYPE B GAS VENT