The H1/4U-SS4010 flat fan nozzle has a spray angle of only 40 degrees at a pressure of 3bar and a flow rate of 3.9L/min. This means it has a stronger impact. Generally, for surfaces that are difficult to clean, we recommend customers to use flat fan nozzles below 40 degrees. Because of the same flow rate, the smaller the spray angle, the stronger the impact that the nozzle can produce. However, if the spray angle is smaller, the spray coverage will be further reduced. Therefore, the spray angle of 40 degrees has both a strong impact and a larger coverage. Therefore, in high-pressure washing applications, the 40-degree flat The fan-shaped nozzle has the best application effect.