Engineered wood products such as particleboard have widely been used with wood veneer and laminate to form multilayer assembly work surfaces or panels. A coupled 1D multilayer model based on CHAMPS (coupled heat, air, moisture and pollutant simulations) is developed. The model parameters, storage and transport properties of each material layer, were determined. The numerical model simulation results were compared with experimental data of both hexanal and acetaldehyde emissions in a 50L standard small scale chamber. The model can be used to predict the emission rate from assemblies based on the emission properties of individual materials.