Two flammable gases in a glovebox (HC-230C-3) at the Plutonium Finishing Plant (PFP) were modeled to quantify the amount of flammable gas and its spatial location. The two flammable gases are butene (C4H8) and carbon monoxide (CO). Butene is a hydrocarbon (C4H8) gas that is released from magnesium hydroxide precipitate containing dibutyl-phosphate when sufficiently heated. Carbon monoxide is a flammable gas that is released from precipitate containing oxalic acid when sufficiently heated. The model for calculating butene and carbon monoxide gas concentrations is described in Section 2.0. The scenarios of release with the specific model and parameters are described in Section 3.0. The results of calculations are described in Section 4.0 with the summary and conclusions appearing in Section 5.0.