40 AND 50 GALLON 40,000 BTU/HR MODELS
See Chart below for maximum length.
FIGURE39.
•The total vertical and horizontal vent run cannot exceed the maximum length with the number of 90o elbows as specified in the following tables. If more are required the venting distance must be reduced 5 feet for every 90o elbow.
75 GALLON 70,000 AND 75,000 BTU/HR MODELS ONLY
3” DIA. VENT | NUMBEROF |
MAX. LENGTH (FT.) | 90o ELBOWS* |
70 | 1 |
65 | 2 |
60 | 3 |
55 | 4 |
50 | 5 |
45 | 6 |
75 GALLON 70,000 AND 75,000 BTU/HR MODELS ONLY -
OPTIONAL 4” VENT PIPING
4” DIA. VENT | NUMBEROF |
MAX. LENGTH (FT.) | 90o ELBOWS* |
110 | 1 |
105 | 2 |
100 | 3 |
95 | 4 |
90 | 5 |
85 | 6 |
ALL 40 AND 50 GALLON 40,000 BTH/HR MODELS ONLY | |
|
|
3” DIA. VENT | NUMBEROF |
MAX. LENGTH (FT.) | 90o ELBOWS* |
115 | 1 |
110 | 2 |
105 | 3 |
100 | 4 |
95 | 5 |
90 | 6 |
ALL 40 AND 50 GALLON 40,000 BTH/HR MODELS ONLY -
OPTIONAL 2” VENT PIPING
2” DIA. VENT | NUMBEROF |
MAX. LENGTH (FT.) | 90o ELBOWS* |
50 | 1 |
45 | 2 |
40 | 3 |
35 | 4 |
30 | 5 |
25 | 6 |
*Two 45o elbows are equivalent to one 90o elbow.
One 90o elbow equals 5 feet of equivalent vent length.
FIGURE40.
•Minimum vent length for all 40,000 BTU/HR input models is 4 feet and 16 inches for all other models.
VENTING THROUGH AN OUTSIDE WALL WITH LOW GROUND CLEARANCE
•When the venting piping cannot pass through an outside wall at a height greater than or equal to 12” above the ground (or above snow accumulation level), then the installation can be modified as shown below.
FIGURE41.
•Refer to the tables on page 23 for maximum vent lengths for low ground clearance installations. All installations assume the use of two additional 90 elbows and the standard 45o vent cap with screen outside of the exterior wall.
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