Multiple Appliance For Interior And Exterior Masonry Chimney - Lennox 18M7901 Installation Instructions Manual

Type B Double Wall Vent Connectors Serving a Single 80AF1UH, ML180UH, EL280UH or SL280UH Furnace
with Masonry Chimney Vent Adapter Kit and One or More Drafthood−Equipped Appliances
Vent
Height
H
(ft)
6
8
10
15
20
30
35
Height
H
(ft)
6
8
10
15
20
30
35
NR − Not recommended for vent configuration.

Multiple Appliance for Interior and Exterior Masonry Chimney

Connector
Rise
R
(ft)
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
Multiple Appliance for Interior and Exterior Masonry Chimney
MASONRY CHIMNEY INTERNAL AREA
Minimum Internal Area of Chimney (Square Inches)
38
Combined Appliance Input Rating in Thousands of Btu Per Hour
NAT
+NAT
103
119
131
152
172
198
NR
TABLE 4
Type B Double Wall Connector Diameter − (inches)
6 in.
Appliance Input Rate in Thousands of Btu per Hour
NAT
Max
101
124
143
105
127
145
108
129
148
114
134
153
119
138
157
127
145
163
131
149
167
TABLE 5
50
NAT
+NAT
143
163
177
212
243
278
291
Page 5
7 in. 8 in.
NAT NAT
Max Max
141 201
173 232
203 270
148 210
179 240
206 276
153 216
184 247
209 281
164 229
192 260
215 292
173 239
199 270
222 301
187 255
209 287
233 317
194 265
216 297
240 332
63
NAT
+NAT
188
218
236
283
325
381
401