RPD-I-S Rev A
20
Venting continued-
TABLE 3
3” (7.6 cm) VENT CONNECTOR LENGTHS FROM INSIDE WALL FOR
LOW GROUND CLEARANCE INSTALLATIONS
Terminating
# of Elbows
(excl. vent term.)
Max Straight
Length ft (m)
Min
straight
Length
ft (m)
48,65
gal.
75 gal.
(2) 90
Elbows with (1)
90
Elbow
1
40
(12.2)
30
(9.1)
5
(1.5)
(2) 90
Elbows with (1)
90
Elbow
2
35
(10.7)
25
(7.6)
5
(1.5)
(2) 90
Elbows with (1)
90
Elbow
3
30
(9.1)
20
(6.1)
5
(1.5)
(2) 90
Elbows with (1)
90
Elbow
4
25
(7.6)
15
(4.6)
5
(1.5)
TABLE 4
4” (10.2 cm) VENT CONNECTOR LENGTHS FROM INSIDE WALL FOR
LOW GROUND CLEARANCE INSTALLATIONS
Terminating (Reduce 4”
to 3”) (Reduce 10.1 cm
to 7.6 cm)
# of Elbows
(excl. vent
term.)
Max straight
Length ft (m)
Min
straight
Length
ft (m)
48,65
gal.
75 gal.
(2) 90
Elbows with (1) 90
Elbow
1
85
(25.9)
75
(22.9)
10
(3.1)
(2) 90
Elbows with (1) 90
Elbow
2
80
(24.4)
70
(21.3)
10
(3.1)
(2) 90
Elbows with (1) 90
Elbow
3
75
(22.9)
65
(19.8)
10
(3.1)
(2) 90
Elbows with (1) 90
Elbow
4
70
(21.3)
60
(18.3)
10
(3.1)
(2) 90
Elbows with (1) 90
Elbow
5
65
(19.8)
55
(16.8)
10
(3.1)
HIGH ALTITUDE INSTALLATIONS FOR ELEVATIONS OVER 2,500
FEET (762 m) ABOVE SEA LEVEL
The capacity of the induced draft blower declines with increasing altitude due to
a reduction in the air density. In order to assure safe and reliable performance
of the water heater, contact the supplier for high altitude kit.
