Navien NPE-180A User Manual page 2

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 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.
CAUTION
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.
Total length (L) = W + H
Required Load
(Total BTU/H)
NPE-180A
300,000 2
330,000 1
360,000
379,000
398,000
540,000
559,000
578,000
597,000
739,000
758,000
777,000
796,000
995,000
1,194,000
1,393,000
1,592,000
1,791,000
1,990,000
2,189,000
2,388,000
2,587,000
2,786,000
2,985,000
3,184,000
Model
NPE-210A NPE-240A
1
2
1 1
2
3
2 1
1 2
3
3 1
2 2
1 3
4
5
6
7
8
9
10
11
12
13
14
15
16
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Total length (ft)
D= 3" D=4"
60(18m) 100(30m) 160(48m)
60(18m) 100(30m) 160(48m)
60(18m) 100(30m) 160(48m)
60(18m) 100(30m) 160(48m)
60(18m) 100(30m) 160(48m)
70(21m) 110(33m)
70(21m) 110(33m)
70(21m) 110(33m)
70(21m) 110(33m)
D=5" D=6"
80(24m) 120(37m)
80(24m) 120(37m)
80(24m) 120(37m)
80(24m) 120(37m)
60(18m) 90(27m) 130(40m)
- 80(24m) 100(30m)
70(21m)
D=7" D=8"
82(25m) 107(33m) 135(41m)
73(22m) 95(29m) 120(37m)
65(20m) 85(26m) 108(33m)
78(24m)
71(22m)
D=9" D=10"
83(25m) 103(31m) 124(38m)
77(23m) 95(29m) 115(35m)
72(22m) 89(27m) 108(33m)
68(21m) 83(25m) 101(31m)
D=5" D=6"
-
-
-
-
-
160(48m)
160(48m)
160(48m)
160(48m)
D=7" D=8"
- -
- -
- -
- -
-
140(43m)
90(27m) 120(36m)
D=9" D=10"
148(45m)
133(41m)
98(30m) 121(37m)
90(27m) 111(34m)
D=11" D=12"
137(42m)
128(39m)
120(36m)
Rev. 6/15