Page 122 - 2018_IFGC

CHIMNEYS AND VENTS

NAT Max Max 1,112 1,793 1,094 1,025 239 1,679 981 264 1,638 940 318 1,560 877 1,243 2,080 1,225 2,052 1,147 2,006 1,099 1,961 1,050 295 1,832 984 132

Type B double-wall connector 2 1 FAN NAT Min Max 111 717 169 1,766 210 1,721 99 812 155 774 195 733 222 702 246 1,916

TYPE B DOUBLE-WALL CONNECTOR DIAMETER —(D) Inches to be used with chimney areas within the size limits at bottom
Single Category I FAN Max Min 1,240 81 1,216 683 125 1,176 648 158 1,139 621 181 1,103 592 203 1,035 555 249 1,413 72 116 1,387 147 1,347 170 1,307 1,269 669 190 1,196 623 233 95

Number of Appliances Appliance Type Appliance Vent Connection 0 1 NAT FAN Max Max 558 985 526 962 500 927 476 893 450 860 416 NA 633 1,106 1,083 596 1,047 567 1,010 539 511 977 468 NA 78

APPLIANCE INPUT RATING IN THOUSANDS OF BTU/H
NAT Min Max 68 421 106 393 135 373 156 353 176 332 NA 288 61 477 98 445 126 424 146 400 165 376 NA 327

Max 762 741 709 NA NA NA 840 819 NA NA NA NA 63
9
FAN
Min 57 90 115 NA NA NA 51 83 NA NA NA NA
NAT Max 303 281 263 243 227 188 351 323 304 282 264 NA Seven times the listed appliance categorized vent area, flue collar area or draft hood outlet area.

Max 581 561 NA NA NA NA NA NA NA NA NA NA 50
8
FAN
Min 47 75 NA NA NA NA NA NA NA NA NA NA
NAT Max 216 198 184 171 159 NA 251 230 215 199 185 NA

Max NA NA NA NA NA NA NA NA NA NA NA NA 38
7
FAN
Min Max NA 137 NA 128 NA 115 NA 107 NA 91 NA NA NA 161 NA 151 NA 138 NA 127 NA NA NA NA
TABLE 504.2(3)—continued MASONRY CHIMNEY 5 FAN NAT Max Min Max NA NA 82 NA NA 76 NA NA 67 NA NA NA NA NA NA NA NA NA NA NA 92 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 28 1 inch = 25.4 mm, 1 square inch = 645.16 mm 2 , 1 foot = 304.8 mm, 1 British thermal unit per hour = 0.2931 W.
NAT
6

FAN
Min Max NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 19

NAT Max 41 NA NA NA NA NA NA NA NA NA NA NA
Max NA NA NA NA NA NA NA NA NA NA NA NA 12
4
FAN
Min NA NA NA NA NA NA NA NA NA NA NA NA

LATERAL (L) (feet) 2 5 10 15 20 30 2 5 10 15 20 30 Minimum Internal Area of Chimney (square inches) Maximum Internal Area of Chimney (square inches)

3
HEIGHT (H) (feet) 30 50 For SI:

2018 INTERNATIONAL FUEL GAS CODE ® 109
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