I'm assembling my new R4512 Table Saw. The instruction manual says not to install the dust collector "funnel" unless you will be using a dust collection system. Apparently there is some danger in doing that. Does anyone know why? I like the idea of all the dust falling into a pile below the saw for easy clean-up. However, I don't have a dust collection system, e.g., large shop-vac, and don't want to do anything that could be harmful.