Technical information

14
Servicing should only be performed by a Qualied 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 BCL3 95T199 6NOX
Input: 199,000 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)
199,000 1 Ft. 7 7 7 6 6 6 6 6
199,000 2 Ft. 7 7 6 6 6 6 6 6
199,000 3 Ft. 6 6 6 6 6 6 6 6
Number of 199 Heaters Combined Input (Btu/hr) Manifold and Common Vent Diameters (Inches)
2 398,000 9 8 8 8 7 7 7 6
3 597,000 10 10 10 9 9 8 8 7
4 796,000 12 12 12 10 10 9 9 8
MODEL (A)BCL3 85T275 6NOX
Input: 275,000 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)
275,000 1 Ft. 8 8 8 7 7 6 6 6
275,000 2 Ft. 8 8 7 7 7 6 6 6
275,000 3 Ft. 7 7 7 7 7 6 6 6
Number of 275 Heaters Combined Input (Btu/hr) Manifold and Common Vent Diameters (Inches)
2 550,000 10 10 9 9 8 8 7 7
3 825,000 14 12 12 10 10 9 9 8
4 1,100,000 14 14 14 12 12 12 10 9
MODEL (A)BCL3 85T390 6NOX
Input: 390,000 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)
390,000 1 Ft. - - - - 8 7 7 6
390,000 2 Ft. - - - 8 8 7 7 6
390,000 3 Ft. - - 8 8 8 7 7 6
Number of 400 Heaters Combined Input (Btu/hr) Manifold and Common Vent Diameters (Inches)
2 780,000 12 12 12 10 10 9 9 8
3 1,170,000 16 14 14 14 12 12 10 9
4 1,560,000 16 16 16 14 14 14 12 10