I'm setting up a dust collection system for my garage woodworking shop. My plan is to build a manifold for various tools to feed into, with a single 4" exhaust port connected to the dust collector. This manifold is an 8" square by 5' box, with 4", 2 1/2" and 1 1/2" hoses going into it. All unused hoses will be blocked off by blast gates on the manifold. My question is: Do the dimensions of this box make much difference to the airflow at the tool? I know the airflow inside the larger volume box will slow, so that's why I'm putting the exhaust at the bottom. I think the air speed should pick up again in the narrower hose to the tool, but I'm not sure. I could make the box cross section only 5" square if I had to, but 8 is more convenient. Do you think it matters to performance?