18.1 CO2 (Range 852, 1582, 2982 ppm , 3.01% 9.92% ) 18.2 O2 ( Range 4.93% , 15.71% , 24.2 % ) 18.3 CH4 ( 2.46% ) 18.4 FLUE GAS ANALYZER ( 02 , CO2 CH4...