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Installation / Operation Instruction Manual

ManualsBrandsBradford White ManualsPlumbingResidential Power Vent Gas Water Heater with 40 Gallon Capacity and 40000 BTU
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12
Venting continued-
TABLE 1 - VENT CONNECTOR LENGTHS
FOR 3” (7.6 cm) DIAMETER VENT PIPE
Terminating
# of
Elbows
(excl. vent
term.)
Maximum Straight
Length ft (m)
Minimum
Straight Length
ft (m)
48 gal.
Through the Wall
1
45 (13.7)
2 (.6)
Through the Wall
2
40 (12.2)
2 (.6)
Through the Wall
3
35 (10.7)
2 (.6)
Through the Wall
4
30 (9.2)
2 (.6)
Through the Roof
0
50 (15.2)
7 (2.1)
Through the Roof
1
45 (13.7)
7 (2.1)
Through the Roof
2
40 (12.2)
7 (2.1)
Through the Roof
3
35 (10.7)
7 (2.1)
TABLE 2 -VENT CONNECTOR LENGTHS
FOR 4” (10.2 cm) DIAMETER VENT PIPE
Terminating
# of 90
Elbows (excl.
vent term.)
Maximum Straight
Length ft (m)
Min
Straight
Length
ft (m)
48 gal.
Through the Wall
1
175 (53.3)
10 (3.1)
Through the Wall
2
170 (51.8)
10 (3.1)
Through the Wall
3
165 (50.3)
10 (3.1)
Through the Wall
4
160 (48.8)
10 (3.1)
Through the Wall
5
155 (47.2)
10 (3.1)
Through the Roof
0
180 (54.9)
15 (4.6)
Through the Roof
1
175 (53.3)
15 (4.6)
Through the Roof
2
170 (51.8)
15 (4.6)
Through the Roof
3
165 (50.3)
15 (4.6)
Through the Roof
4
160 (48.8)
15 (4.6)
NOTE: When using 4 in (10.2 cm) vent pipe, use a 4 in (10.2 cm) to 3 in
(7.6 cm) reducer and exit the building wall with 3 in (7.6 cm) vent pipe using the
3 in (7.6 cm) 90 vent terminal supplied. Two 45 elbows are equivalent to one
90 elbow.
Example of Total Vent Length
A 3 in (7.6 cm) venting system has a total of six 90° elbows and a total straight pipe length
of 20 ft (6.1 m). Equivalent vent length for elbows: 6 x 5 ft = 30 ft (9.2 m). Total equivalent
vent distance = 20 ft + 30 ft = 50 ft (15.2 m). This is equal to the maximum allowed
distance of 50 ft (15.2 m) for this model using 3 in (7.6 cm) vent.
A 4 in (10.2 cm) venting system has a total of twelve 90° elbows and a total straight pipe
length of 120 ft (36.5 m). Equivalent vent length for elbows: 12 x 5 ft = 60 ft (18.3 m). Total
equivalent vent distance = 120 ft + 60 ft = 180 ft (54.8 m). This is equal to the
maximum allowed distance of 180 ft (54.9 m) for this model using 4 in (10.2 cm)
vent.