Installation / Operation Instruction Manual

12
Venting continued-
TABLE 1
Vent Connector Lengths For 2” (5.1 cm) Diameter Vent Pipe
Terminating
# of 90 Elbows
(excluding vent
terminal)
Maximum
Straight Length
ft (m)
Minimum
Straight Length
ft (m)
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 (9.1)
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)
Through the Roof
4
30 (9.2)
7 (2.1)
NOTE: When using 3 in (7.6 cm) vent pipe, use a 3 in (7.6 cm) to 2 in (5.1 cm)
reducer and exit the building wall with 2 in (5.1 cm) vent pipe using the 2 in (5.1 cm)
90 vent terminal supplied. Two 45 elbows are equivalent to one 90 elbow. Each
90° elbow is equivalent to 5 ft (1.5 m) of straight vent pipe.
Example of Total Vent Length
A 2 in (5.1 cm) venting system has a total of three 90° elbows and a total straight pipe
length of 35 ft (10.6 m). Equivalent vent length for elbows: 3 x 5 ft = 15 ft (4.6 m). Total
equivalent vent distance = 35 ft + 15 ft = 50 ft (15.2 m). This is equal to the maximum
allowed distance of 50 ft (15.2 m) for this model using 2 in (5.1 cm) vent.
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.
TABLE 2
Vent Connector Lengths For 3” (7.6 cm) Diameter Vent Pipe
Terminating
# of 90 Elbows
(excluding vent
terminal)
Maximum
Straight Length
ft (m)
Minimum
Straight Length
ft (m)
Through the Wall
1
115 (35)
10 (3.1)
Through the Wall
2
110 (33.5)
10 (3.1)
Through the Wall
3
105 (32.0)
10 (3.1)
Through the Wall
4
100 (30.5)
10 (3.1)
Through the Wall
5
95 (29.0)
10 (3.1)
Through the Roof
0
120 (36.6)
15 (4.6)
Through the Roof
1
115 (35)
15 (4.6)
Through the Roof
2
110 (33.5)
15 (4.6)
Through the Roof
3
105 (32.0)
15 (4.6)
Through the Roof
4
100 (30.5)
15 (4.6)