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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 (gure 13) and tables
below which give sizing and data based upon NFPA 54/ANSI
Z223. 2006.
TABLE 7. TECHNICAL DATA VENTING
Model 500
Input: 500,000 btu/hr
Total Vent Height (Feet)
Vent connector size: 8 inches 6 8 10 15 20 30 50 100
Input (btu/hr) Rise Vent Connector Diameter (Inches)
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
Multiple Fan Assisted Water Heaters
Total Vent Height (Feet)
Number of 500
Heaters
Combined
Input (btu/hr)
6 8 10 15 20 30 50 100
Manifold and Common Vent Diameter (Inches)
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
Combination of Multiple Fan Assisted and Natural Draft Water Heaters
Total Vent Height (Feet)
Number of 500
Heaters
Combined
Input (btu/hr)
6 8 10 15 20 30 50 100
Manifold and Common Vent Diameter (Inches)
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