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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 (figure 4) and
tables below which give sizing and data based upon
NFPA 54/ANSI Z223. 1992.
TABLE 6. TECHNICAL DATA VENTING
MODEL BCG3-80T150-6NOX
Input: 154,000 Btu/hr Total Vent Height (Feet)
Vent Connector Size: 6 inches 6 8 10 15 20 30 50 100
Input Btu/hr Rise Vent Connector Diameter (Inches)
154,000 1 Ft. 6 6 6 6 6 6 6 6
154,000 2 Ft. 6 6 6 6 6 6 6 6
154,000 3 Ft. 6 6 6 6 6 6 6 6
Number of Combined Input
Heaters in Thousands of Btu/hr Manifold and Common Vent Diameter (Inches)
2 308,000 7 7 6 6 6 6 6 6
3 462,000 8 8 7 7 7 6 6 6
4 616,000 9 9 9 8 8 7 7 6
MODEL BCG3-100T250-6NOX
Input: 250,000 Btu/hr Total Vent Height (Feet)
Vent Connector Size: 6 inches 6 8 10 15 20 30 50 100
Input Btuh/hr Rise Vent Connector Diameter (Inches)
250,000 1 Ft 8 8 7 7 7 6 6 6
250,000 2 Ft 7 7 7 7 6 6 6 6
250,000 3 Ft 7 7 7 7 6 6 6 6
Number Combined Input
of Heaters in Thousands of Btu/hr Manifold and Common Vent Diameter (Inches)
2 500,000 9 9 9 8 8 7 7 7
3 750,000 12 12 10 10 10 9 8 8
4 1,000,000 14 14 12 12 10 10 9 9
MODEL BCG3-85T390-6NOX
Input: 399,000 Btu/hr Total Vent Height (Feet)
Vent Connector Size: 6 inches 6 8 10 15 20 30 50 100
Input Btu/hr Rise Vent Connector Diameter (Inches)
366,000 1 Ft 9 9 9 8 8 8 8 8
399,000 1 Ft 10 9 9 9 8 8 8 8
366,000 2 Ft 9 9 8 8 8 8 8 8
399,000 2 Ft 9 9 9 8 8 8 8 8
366,000 3 Ft 9 8 8 8 8 8 8 8
399,000 3 Ft 9 9 8 8 8 8 8 8
Number of Combined Input
Heaters in Thousands of Btu/hr Manifold & Common Vent Diameter (Inches)
2 732,000 12 10 10 9 9 9 8 8
798,000 12 12 10 10 9 9 8 8
3 1,098,000 14 14 14 12 12 10 9 9
1,197,000 14 14 14 12 12 10 10 9
4 1,464,000 16 16 14 14 14 12 12 10
1,596,000 16 16 16 14 14 12 12 10