A problem exists in the determination of the allowable emission rate (AER) from agricultural facilities using process weight tables (PWT). SAPRAs are using different PWT models and the basis of these different models is unknown. A new PWT model is proposed based upon the NSPS allowable emission rate of a 1,000 MW coal-fired power plant. Calculated factors for cotton gins, based on the AER, derived from the new model correspond to EPA AP-42 emission factors based upon source sampling. If SAPRAs were to replace their current models with the new model, a uniform method would exist for determining allowable emission rates for agricultural facilities.