Navien NPE-180A User Manual - page 2
CAUTION
3. Refer to the common vent table below to determine the maximum allowable lengths for the common vent, based on the total
BTU/H rating, and the diameter of the vent pipe.
Note
Regardless of the vent size listed in the table, the connection to the common vent must always be as large as the largest connector.
If the largest connector and the recommended vent are the same size, use the next largest size for the vent.
For each short radius elbow that will be used in the vent, add 8 feet (2.4 m) to the total length. For each long radius
elbow that will be used in the vent, add 5 feet (1.5m) to the total length.
Total length (L) = W + H
Required Load
(Total BTU/H)
Model
Total length (ft)
NPE-180A
NPE-210A
NPE-240A
D= 3"
D=4"
D=5"
D=6"
300,000
2
60(18m)
100(30m)
160(48m)
-
330,000
1
1
60(18m)
100(30m)
160(48m)
-
360,000
2
60(18m)
100(30m)
160(48m)
-
379,000
1
1
60(18m)
100(30m)
160(48m)
-
398,000
2
60(18m)
100(30m)
160(48m)
-
540,000
3
70(21m)
110(33m)
160(48m)
559,000
2
1
70(21m)
110(33m)
160(48m)
578,000
1
2
70(21m)
110(33m)
160(48m)
597,000
3
70(21m)
110(33m)
160(48m)
D=5"
D=6"
D=7"
D=8"
739,000
3
1
80(24m)
120(37m)
-
-
758,000
2
2
80(24m)
120(37m)
-
-
777,000
1
3
80(24m)
120(37m)
-
-
796,000
4
80(24m)
120(37m)
-
-
995,000
5
60(18m)
90(27m)
130(40m)
-
1,194,000
6
-
80(24m)
100(30m)
140(43m)
1,393,000
7
70(21m)
90(27m)
120(36m)
D=7"
D=8"
D=9"
D=10"
1,592,000
8
82(25m)
107(33m)
135(41m)
1,791,000
9
73(22m)
95(29m)
120(37m)
148(45m)
1,990,000
10
65(20m)
85(26m)
108(33m)
133(41m)
2,189,000
11
78(24m)
98(30m)
121(37m)
2,388,000
12
71(22m)
90(27m)
111(34m)
D=9"
D=10"
D=11"
D=12"
2,587,000
13
83(25m)
103(31m)
124(38m)
2,786,000
14
77(23m)
95(29m)
115(35m)
137(42m)
2,985,000
15
72(22m)
89(27m)
108(33m)
128(39m)
3,184,000
16
68(21m)
83(25m)
101(31m)
120(36m)
Rev. 6/15
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