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Servicing should only be performed by a Qualied Service Technician
VENTING TABLES – TECHNICAL VENTING DATA
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 and tables below which give sizing
and data based upon NFPA 54 ANSI Z223.1.
Model BCL381T1206NOX
Input: 120,000 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)
120,000 1 ft. 6 6 5 5 5 5 5 5
120,000 2 ft. 5 5 5 5 5 5 5 5
120,000 3 ft. 5 5 5 5 5 5 5 5
Number of 120 Heaters
Combined Input in
Thousands of Btu/hr
Manifold and Common Vent Diameter (Inches)
2 240,000 7 7 6 6 6 6 6 6
3 360,000 8 8 7 7 7 6 6 6
4 480,000 9 9 9 8 8 7 7 6
Model BCL381T1546NOX
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 154 Heaters
Combined Input 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 BCL395T1806NOX/1996NOX
Input: 180,000 and 199,000 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)
180,000 1 ft. 7 7 6 6 6 6 6 6
199,000 1 ft. 7 7 7 6 6 6 6 6
180,000 2 ft. 6 6 6 6 6 6 6 6
199,000 2 ft. 7 7 6 6 6 6 6 6
180,000 3 ft. 6 6 6 6 6 6 6 6
199,000 3 ft. 6 6 6 6 6 6 6 6
Number of Heaters
Combined Input in
Thousands of Btu/hr
Manifold and Common Vent Diameter (Inches)
2
360,000 8 8 8 7 7 7 6 6
398,000 8 8 8 7 7 7 6 6
3
540,000 10 9 9 9 8 8 7 7
597,000 10 9 9 9 8 8 7 7
4
720,000 12 12 10 10 9 9 8 8
796,000 12 12 10 10 9 9 8 8
Model (A)BCL395T2506NOX
Input: 250,000 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)
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 of 250 Heaters
Combined Input 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