Bradford White TW4-75S-76B-3X - Manual (Page 18)

18
Venting continued-
TABLE 3
3 inch (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.
25, 55
and 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 inch (10.2 cm) VENT CONNECTOR LENGTHS FROM INSIDE WALL
FOR LOW GROUND CLEARANCE INSTALLATIONS
Terminating (Reduce 4 inch to
3 inch)
(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.
25, 55
and 75
gal.
(2) 90  Elbows with (1) 90 Elbow 1
160
(48.8)
160
(48.8)
10 (3.1)
(2) 90  Elbows with (1) 90 Elbow 2
155
(47.2)
155
(47.2)
10 (3.1)
(2) 90  Elbows with (1) 90 Elbow 3
150
(45.7)
150
(45.7)
10 (3.1)
(2) 90  Elbows with (1) 90 Elbow 4
145
(44.2)
145
(44.2)
10 (3.1)
(2) 90  Elbows with (1) 90 Elbow 5
140
(42.7)
140
(42.7)
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.