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) 12
8(39m)
3,184,000 16 68(21m) 83(25m) 101(31m) 120(36m)
Rev. 6/15
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