My router table has a split face on its fence. This makes it easy to adjust the opening to accommodate router bits of varying diameters. The problem is, dust collection is less effective due to the opening in the fence.
To get around this, I installed Masonite baffles. They overlap and slide past one another while reducing the opening in the router fence.
The process is simple. Cut a narrow slot in each half of the fence face. The width is sized for two thicknesses of Masonite. A bevel on one end of each strip helps realign the baffles if the two fence faces are ever pulled far apart.