Doing my wood work, I, like so many others, have the dust problem. It gets everywhere. I've tried vacuums, made boxes, forced air, etc, with little progress. Then I found the problem and something for about a $1.00 that has come to the rescue and works.
My 3.5 hp Bosch router blows out from the bottom. It does that to cool, etc. This is something that does not need to get clogged or sealed off. If it does, it will burn the router up. I have a hose adapted next to my bit to pull grinds but there is so much power from the router that the router prevents any direct flow to my vacuum hose, thus grinds go everywhere.
So to correct the problem all I needed to do was reroute the air flow, thus prevent it from blowing my grinds everywhere.
This is really too simple but took 3 years to figure out. I took my face mask off and pulled it over my bit and strapped it to my router with the rubber bands. The collet keeps the space required from my blow-bys on the bottom of the router. Now air shoot up and not down.
Now there is no air blowing to my bit so my vacuum is now doing the job that it suppose to do. This has cut my dust 80% and maybe more.
If your router blows from the bottom...try this trick. It may help.
Stephen Cheek
Built my CNC in 2007
Somewhere on this site you can see my CNC and how I made it.