So my brain says the bucket of water under the grinder is a must. Buy a Grizzly Dust Collector and only use it when grinding metal. Since I do very little wood - only handles; let the shop vac take care of that. I will use the same shop vac on the shop and metal dust, but well after there is no chance of hot metal. I have a dedicated garage for making knives to explain my environment. Feel free to poke holes in this plan.
WNC - I would like more info on your overhead dust unit if you have any. I am not familiar but would be interested.
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