Page 183 - 2018_IFGC

APPENDIX D

3
An alternate method of calculating the CO air free when access to an
oxygen meter is not available:
---------------- ×
CO AFppm =   UCO 2 2  CO
CO 
where:
UCO = Ultimate concentration of carbon dioxide for the fuel being
2
burned in percent for natural gas (12.2 percent) and propane
(14.0 percent)
CO = Measured concentration of carbon dioxide in combustion
2
products in percent
CO = Measured concentration of carbon monoxide in combustion
products in percent

170 2018 INTERNATIONAL FUEL GAS CODE ®
Copyrighted © 2017 by, or licensed to, ICC (ALL RIGHTS RESERVED); licensed to UL, LLC pursuant to License Agreement with ICC. No further reproductions authorized or distribution authorized.
ANY UNAUTHROIZED REPRODUCTION OR DISTRIBUTION IS A VIOLATION OF THE FEDERAL COPYRIGHT ACT AND THE LICENSE AGREEMENT; AND SUBJECT TO CIVIL AND CRIMINAL PENALTIES THEREUNDER.