Modine Manufacturing HD Installation And Service Manual page 10

UNIT LOCATION
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.
Table 10.1 - Maximum Vent Connector Horizontal Run
(ft) Type B Vent connector and Type B Common Vent
Connector
Model
Dia.
6 ft.
3 6
4 4
HD30
5 NA
3 NA
HD45
4 6
5 NA
3 NA
HD60
4 6
5 6
4 NA
HD75
5 6
Based on NFPA Tables 13.6, 13.1 & section 13.2.3
Table 10.2 - Maximum total appliance input Capacities (MBh)
Type B Vent connector and Type B Common Vent
Vent
2
Height
4 in
(ft)
Fan+ Fan
6 92
8 101
10 110
15 125
20 136
30 152
Based on NFPA Table 13.6.
Table 10.3 - Maximum Connector Horizontal Run (ft)
Type B Vent connector with common vent into
Masonry Chimney
Connector
Model
Dia. (in)
6 ft.
3 4.5
4 NA
HD30
5 NA
3 4.5
HD45
4 6
5 NA
3 NA
HD60
4 6
5 7.5
4 NA
HD75
5 7.5
Based on NFPA table 13.8 & 13.2.2 "Vent Connector Maximum Length" in section 13.2
10
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
2
5 in
Fan+ Nat Fan+ Fan Fan+ Nat
81 140
90 155
97 169
112 195
123 215
138 244
Vent Height
8 ft. 10 ft. 15 ft. 20 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 6
NA NA NA NA
NA NA NA NA
6 6 6 6
7.5 7.5 7.5 7.5
6 6 6 6
7.5 7.5 7.5 7.5
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 10.2 and 10.4 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.
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
30 ft.
system (Refer to figures 11.1 and 11.2).
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8. All units must be vented in strict accordance of the common
6 venting tables 10.1, 10.2, 10.3, and 10.4.
NA
9. All masonry chimneys must comply with all applicable local
and national codes.
13.5
15
10. When combining multiple vent connectors into a manifold
NA prior to the vertical portion of the common vent, the size of
the common vent manifold and the common vent shall be
4.5
determined by applying a 10% reduction (.90 x maximum
23
vent capacity from table 10.2 or 10.4) to the common vent
17
capacity part of the common vent tables (refer to figure
30
11.3). The length of the common vent manifold (Lm) may
24
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.
Area of Common Vent
2
6 in
Fan+ Fan Fan+ Nat
116 204 161
129 224 178
141 243 194
164 283 228
183 314 255
210 361 297
Table 10.4 - Maximum total appliance input Capacities
(MBh) Type B Vent connector with common vent into
Masonry Chimney
Vent
12 in
30 ft.
Height
(ft.) Fan+
4.5
Fan
NA
6 NA
NA
8 NA
4.5
10 NA
6
15 NA
NA
20 NA
NA
30 NA
6
7.5
Based on NFPA Table 13.8
6
7.5
6-576.5
2
7 in
Fan+ Fan Fan+ Nat
309 248
339 275
367 299
427 352
475 394
547 459
Area of Common Vent
2 19 in 2 28 in
Fan+ Fan+ Fan+
Fan+ Fan+
Nat Fan Nat Fan
74 NA 119 NA 178
80 NA 130 NA 193
84 NA 138 NA 207
NA NA 152 NA 233
NA NA NA NA 250
NA NA NA NA 270
2 38 in 2
Fan+ Fan+
Nat Fan Nat
NA 257
NA 279
NA 299
NA 334
NA 368
NA 404