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ONE ELBOW
EXAMPLE
MIN. RISE
1
⁄8″
PER FIVE FEET
3. 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
1. When the vent 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.
2. The total vertical and horizontal vent run cannot
exceed the maximum length with the number of 90°
elbows as specified in the tables below. If more elbows
are required the venting distance must be reduced 5
feet for every 90˚ elbow:
75 GALLON 70,000 and 75,000 BTU/HR, 50 GALLON
52,500, 55,000 and 62,500 BTU/HR and 40 GALLON
50,000 BTU/HR MODELS ONLY
3
″″
DIA. VENT NUMBER OF
MAX. LENGTH (FT.) 90° ELBOWS*
70 1
65 2
60 3
55 4
50 5
45 6
ALL 40 and 50 GALLON 40,000 BTU/HR MODELS ONLY
3
″″
DIA. VENT NUMBER OF
MAX. LENGTH (FT.) 90° ELBOWS*
115 1
110 2
105 3
100 4
95 5
90 6
ALL 40 and 50 GALLON 40,000 BTU/HR MODELS —
OPTIONAL 2
″″
VENT PIPING
2
″″
DIA. VENT NUMBER OF
MAX. LENGTH (FT.) 90° ELBOWS*
50 1
45 2
40 3
35 4
30 5
25 6
*NOTE: Two 45° elbows are equivalent to one 90° elbow.
One 90° elbow equals 5 feet of equivalent vent length.
12″ MIN. ABOVE
GROUND OR SNOW
ACCUMULATION LEVEL
20’
(EXAMPLE)
95’ MAX.
3″ VENT PIPE
40 GALLON
40,000 BTU/HR
MODEL EXAMPLE
4′ MIN.
MIN. RISE
1
⁄8″
PER FIVE FEET
15
1
⁄2″
MIN.
14″ MIN.
SEE CHART BELOW FOR MAX. LENGTH
40 AND 50 GALLON 40,000 BTU/HR MODELS (3″ VENT)
Installing the New Water Heater (cont’d)
18
Venting (cont’d)
VENTING THROUGH AN OUTSIDE WALL (cont’d)
75 GALLON 70,000 and 75,000 BTU/HR, 50 GALLON 52,500,
55,000 and 62,500 BTU/HR and 40 GALLON 50,000 BTU/HR
MODELS ONLY – OPTIONAL 4″ VENT PIPING
4
″″
DIA. VENT NUMBER OF
MAX. LENGTH (FT.) 90° ELBOWS*
110 1
105 2
100 3
95 4
90 5
85 6