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InsTAllATIon - venTIng
Additional requirements for Common venting:
1. The common vent system and all attached appliances must
be Category I.
2. The vent connector should be routed in the most direct route
from the units to the common vent.
3. Where two or more vent connectors enter a common gas
vent or chimney flue, the smaller connector shall enter at
the highest level consistent with the available head room or
clearance to combustible material.
4. Restrictions within the common vent such as elbows should
be minimized. Each elbow installed within the common
portion of the venting system reduces maximum common
vent capacity by 10% (refer to Tables 13.2 and 13.4 for
capacity)
5. The vent connector capacities included in these tables
allow for the use of two 90 degree elbows (or turns). For
each additional elbow, the vent connector capacity shall be
reduced by 10%. Refer to NFPA54/ IFEC tables for capacity
ratings.
6. The common vent cross sectional area must be equal to or
greater than the largest vent connector cross-sectional area.
Table 13.1 - maximum vent Connector Horizontal run
(ft) Type B vent connector and Type B Common vent
Connector
model
dia.
ft.
3
6
4
4
30
5
NA
3
NA
45
4
6
5
NA
3
NA
0
4
6
5
6
4
NA
75
5
6
4
NA
100
5
6
6
6
4
NA
5
NA
125
6
6
Based on NFPA 54 (ANSI Z223.1)2002. For reference only.
Table 13.2 - maximum total appliance input Capacities
(mBh) Type B vent connector and Type B Common vent
diameter of Common vent
vent
4 in.
Height
fan+
fan+
fan+
(ft)
fan
nat
fan
92
81
140
8
101
90
155
10
110
97
169
15
125
112
195
20
136
123
215
30
152
138
244
Based on NFPA 54 (ANSI Z223.1)2002. For reference only.
vent Height
8 ft.
10 ft. 15 ft.
20 ft.
8
10
10
11
4
4
5
5
NA
NA
NA
NA
NA
NA
4.5
9
8
10
10
14
NA
NA
NA
NA
NA
NA
NA
NA
8
10
15
20
8
10
14
15
NA
10
15
20
8
10
15
20
NA
NA
NA
NA
8
10
15
20
8
10
15
20
NA
NA
NA
NA
NA
NA
15
20
8
10
15
20
5 in.
in.
fan+
fan+ fan+
fan+ fan+
nat
fan
nat
fan
116
204
161
309
129
224
178
339
141
243
194
367
164
283
228
427
183
314
255
475
210
361
297
547
7. If all appliances are located on one level of the building, the
vent height shall be measured from the highest draft hood
or vent connector to be installed within the common vent
system (Refer to Figures 14.1 and 14.2).
8. All units must be vented in strict accordance of the common
venting Tables 13.1 through 13.4.
9. All masonry chimneys must comply with all applicable local
and national codes.
10. When combining multiple vent connectors into a manifold
prior to the vertical portion of the common vent, the size of
the common vent manifold and the common vent shall be
determined by applying a 10% reduction (.90 x maximum
vent capacity from Table 13.2 or 13.4) to the common vent
capacity part of the common vent tables (refer to Figure
14.3). The length of the common vent manifold (Lm) may
not exceed 18 inches per inch of manifold diameter.
11. Refer to the National Fuel Gas Code for instructions on
multi-level common venting and exterior masonry chimneys
as well as additional installation of the listed applications.
Table 13.3 - maximum Connector Horizontal run (ft)
Type B vent connector with common vent into
masonry Chimney
Connector
model
dia. (in)
30 ft.
12
3
6
4
30
5
NA
3
13.5
45
4
15
NA
5
3
4.5
0
4
23
5
17
30
4
75
24
5
4
30
100
5
30
6
28
NA
4
30
125
5
6
30
Based on NFPA 54 (ANSI Z223.1)2002. For reference only.
Table 13.4 - maximum total appliance input Capacities
(mBh) Type B vent connector with common vent into
masonry Chimney
vent
7 in.
12 in
Height
(ft.)
fan+
nat
fan
248
NA
275
8
NA
299
10
NA
352
15
NA
394
20
NA
459
30
NA
Based on NFPA 54 (ANSI Z223.1)2002. For reference only.
6-583.2
vent Height
ft.
8 ft.
10 ft. 15 ft.
4.5
4.5
4.5
4.5
NA
NA
NA
NA
NA
NA
NA
NA
4.5
4.5
4.5
4.5
6
6
6
NA
NA
NA
NA
NA
NA
NA
NA
6
6
6
7.5
7.5
7.5
7.5
NA
6
6
7.5
7.5
7.5
7.5
NA
NA
NA
NA
7.5
7.5
7.5
7.5
9
9
9
NA
NA
NA
NA
NA
NA
7.5
7.5
9
9
9
Area of Common vent
2
2
1 in
28 in
fan+
fan+
fan+
fan+
fan+
nat
fan
nat
fan
74
NA
119
NA
80
NA
130
NA
84
NA
138
NA
NA
NA
152
NA
NA
NA
NA
NA
NA
NA
NA
NA
20 ft.
30 ft.
4.5
4.5
NA
NA
NA
NA
4.5
4.5
6
6
6
NA
NA
NA
NA
6
6
6
7.5
7.5
6
6
6
7.5
7.5
6
6
7.5
7.5
9
9
9
NA
NA
7.5
7.5
9
9
9
2
2
38 in
fan+
fan+
nat
fan
nat
178
NA
257
193
NA
279
207
NA
299
233
NA
334
250
NA
368
270
NA
404
13
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