Fan is true to its description: powerful, quiet, well-made. I’ve had this fan for 5 years and it still works great. However- I need to clean the fan blades and my fan has a hard rubber ring around the entire circumference of the fan cage and I can’t figure out any way to separate the cage to clean the blades. I’m sure it’s overly obvious but I could use instructions.  I can’t find anything online or in YouTube for this exact model (again with a hard brown plastic rim surrounding the fan cage).  I’ve unscrewed the bottom screw but that didn’t seem to make any difference.

Thank you in advance for your help.