17
Table 2 - Continued
From 6,000 Ft. (1,829 m) Above Sea Level through 7,700 Ft. (2,347 m) Above Sea Level
Model
Vent &
Combustion
Air-Inlet System
Diameter
Min. Allowed
Equivalent Vent &
Combustion Air-Inlet
Lengths (Each Pipe
Run)
Max. Allowed Equivalent
Vent & Combustion Air-
Inlet Lengths (Each Pipe
Run)
Vent and Combustion Air-Inlet
System Termination(s)Inches Feet Meters Feet Meters
50 Gallon, 65,000 &
47,000 Btu/hr. Models
3 7 2 55 16.5 90° Elbows
3 7 2 45 13.5 Concentric
4 7 2 100 30 90° Elbows
65 Gallon, 65,000 &
56,000 Btu/hr. Models
4 8 3 50 15 90° Elbows
75 Gallon, 75,100
&70,000 Btu/hr. Models
4 8 3 50 15 90° Elbows
From 7,701 Ft. (2347 m) Above Sea Level through 10,200 Ft. (3,109 m) Above Sea Level
Model
Vent &
Combustion
Air-Inlet System
Diameter
Min. Allowed
Equivalent Vent &
Combustion Air-Inlet
Lengths (Each Pipe
Run)
Max. Allowed Equivalent
Vent & Combustion Air-
Inlet Lengths (Each Pipe
Run)
Vent and Combustion Air-Inlet
System Termination(s)Inches Feet Meters Feet Meters
50 Gallon, 65,000 &
47,000 Btu/hr. Models
3 7 2 70 12 90° Elbow
3 7 2 35 10.5 Concentric
4 7 2 100 30 90° Elbow