Operating instructions
Unitary Products Group 3
035-17452-000 Rev. B (0106)
SINGLE APPLIANCE FOR INTERIOR CHIMNEY ONLY
1. Seal any unused openings in the venting system. Inspect the venting system for proper size and horizontal pitch, as required in the National Fuel Gas
Code, ANSI Z233.1 or CAN/CGA B149 Canadian Installation Codes, and these instructions. Determine that there is not blockage or restriction, leak-
age, corrosion and other deficiencies which could cause an unsafe condition.
2. The vent tables are designed for two 90” elbows or equivalent. If additional elbows are used, five feet should be subtracted for each elbow from the
above values.
3. High altitude installation input rates shall be derated starting at 2000 ft. altitude. Sea level input rates shall be used for chimney sizing and venting
guidelines.
4. Vent connector length is limited to 1 1/2 ft. for each inch of vent connector diameter.
5. Vent connectors shall not be upsized more than two sizes greater than the listed appliance vent outlet diameter.
6. For multiple appliance installations, the flow area of the chimney shall not exceed 7 times the smallest draft hood outlet area.
TABLE 2: Vent Table - Interior Chimneys Only
Interior Chimneys Only
Capacity of Masonry Chimney Flue with Type B Dougle-Wall Vent Connectors
Servicing a Single Furnace Equipped with the Tile Lined Chimney Kit
Type B Double-Wall Connector Diameter - D (inches)
To be used with chimney areas within the size limits at the bottom of table
Chimney
Heights H (ft.)
Lateral L
(ft.)
3” 4” 5” 6” 7” 8”
Appliance Input Rate in Thousands of BTU per Hour
NAT NAT NAT NAT NAT NAT
Max. Max. Max. Max. Max. Max.
6
2 285186130180247
5 244980117165230
8
2 29559314518266
5 265188134183247
8 244883127175239
10
2 31 61 103 163 221 298
5 285796148204277
10 25 50 87 139 191 263
15
2 35 67 114 179 250 336
5 34 62 107 164 231 313
10 28 55 97 153 216 296
15
NR 48 89 141 201 281
20
2 38 74 124 201 274 375
5 36 68 116 184 154 350
10
NR 60 107 172 237 332
15
NR NR 97 159 220 314
20
NR NR 83 148 206 295
30
2 41 82 137 216 303 421
5
NR 76 128 198 281 393
10
NR 67 115 184 263 373
15 NR NR 107 171 243 353
20
NR NR 91 159 227 332
30
NR NR NR NR 188 288
50
2
NR 93 161 251 351 477
5
NR NR 151 230 323 445
10
NR NR 138 215 304 424
15 NR NR 127 199 282 400
20
NR NR NR 185 264 376
Minimum area of Chimney - A (sq. in.) 12 19 28 38 50 63
Maximum area of Chimney - A (sq. in.) 49 88 137 198 269 352