These saws have a really bad habit of thin cut offs going down into the dust chute under the blade and then through the port into the extraction hose so you need to make sure you can disconnect the hose at the port easily. Hammer do sell an insert for when a Dado set is used which is wood, comes blank and stops this happening or you can make your own which is a bit of a fiddle as it needs reliefs cut into the under side for it to fit.
Chris
Everything I like is either illegal, immoral or fattening