Several experiments conducted to date suggest that yield of carbon monoxide is strongly affected by 'equivalence ratio'. So it seems worthwhile to develop an empirical model of CO yields as a function of equivalence ratio, and to use this model as the source term in fire models for the prediction of CO concentrations in building fires. In the preceding paper, we presented a theoretical model for predicting the yields of chemical species for propane fire. In this paper, we extend the model to generic fuel, and incorporate the model into BRIZ fire model and attempt to predict the concentrations of CO in transient fire. Also the predictions are compared with the results of the reduced scale single fire tests. Some discrepancies between the predicted and experimental values still remain; however, this methodology seems to be a convenient and viable way of predicting CO yields in transient state.