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APPENDIX C
EXIT TERMINALS OF MECHANICAL
DRAFT AND DIRECT-VENT VENTING SYSTEMS
This appendix is informative and is not part of the code. This appendix is an excerpt from the 2018 International Fuel Gas Code,
coordinated with the section numbering of the International Residential Code.
User note:
About this appendix: Appendix C provides a graphic depiction of the venting terminal location requirements of the code.
MECHANICAL DRAFT
VENT TERMINAL
[SEE SECTION G2427.8, ITEM 1]
MECHANICAL DRAFT
VENT TERMINAL
[SEE SECTION G2427.8, ITEM 2]
DIRECT-VENT TERMINAL CLEARANCE
MINIMUM CLEARANCE, C
INPUT (BTU/HR) CLEARANCE (IN.)
10,000 OR LESS 6
10,001 TO 50,000 9
OVER 50,000 12
[SEE SECTION G2427.8,
ITEM 3]
FORCED-AIR INLET
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 British thermal unit per hour = 0.2931 W.
APPENDIX C
EXIT TERMINALS OF MECHANICAL DRAFT AND DIRECT-VENT VENTING SYSTEMS
2018 INTERNATIONAL RESIDENTIAL CODE ® 843
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