A fan nozzle is an attachment for a pressure washer that shapes the water stream into a flat, wide jet resembling a fan. The main parameter of this nozzle is the spray angle, given in degrees, for example, 15°, 25°, or 40°. This angle determines the width and intensity of the water jet. A smaller angle creates a narrow and powerful stream suitable for removing stubborn dirt from hard surfaces such as concrete or paving. Conversely, a larger angle produces a wide and gentler jet, which is used for washing large and more sensitive surfaces, such as car bodies, facades, or wooden decks. The choice of the correct angle thus directly affects both the speed of work and the safety of the material being cleaned, because while a wider jet covers a larger area, it does so with less pressure intensity at a single point.