According to the National Fire Protection Association, approximately 261,000 fires were intentionally set each year from 2010 to 2014 in the United States, with a resulting annual death rate of about 440 people. Establishing the origin and course of a fire are important first steps for determining whether arson was committed. The role of ventilation in a fire changes the fire patterns and this could lead to investigators making an inaccurate arson ruling. This article details how National Institute of Justice-supported researchers conducted a series of experiments on fires with and without ventilation in order to provide fire investigators with more valid scientific data. It also discusses a secondary study on how energized electrical cords fail when fires progress.