Cooking is one of the most important sources of indoor air pollution in most residences. Until recently, range hoods used to remove pollutants generated during cooking were rated by flow rate and noise criteria only in the United States. We sought to help inform a standardized method of test for range hoods which relates rating more directly to pollutant removal performance. To this end, a numerical model is first validated and then used to assess the effects of several parameters on apparent capture efficiency for a wall-mounted hood. Results show that some seemingly benign variables, such as the size of the test room, have large effects on simulated capture efficiency.