I have 2 bag Jet dust collector. When grinding metal, I just put a garbage can under it. With water for the smaller particles, and without water for the heavier particles. For anything that doesn't go in the garbage can, I just wait till after I'm done grinding to suck it up with the dust collector (and it should be cool by then). For wood, I take the end of the hose and clamp it next to the contact wheel using a vise.