Determine the nozzle size by the pressure washer’s gallons per minute (GPM) and specific pounds per square inch (PSI).  If the nozzle size is too small, your equipment can be damaged.  If the nozzle size is too large, cleaning ability is compromised.  Nozzle fan degree does not effect nozzle size selection.

Select the nozzle degree or spray angle, based on your application.  Standard nozzle degrees- o, 15, 25, and 40 degrees.  Using the wrong nozzle degree can damage the surface you are cleaning.