Originally Posted by
John TenEyck
FWIW, the holes will help with air flow only when the stock is narrow enough to allow them to remain open. Any piece that covers the holes will shut them off. And have you (collective, no one in particular) every considered how few CFM can flow through those little holes. No much. What's more important is how the air comes into the dust collection system below the table. That's where the teeth are carrying the dust and the only place it can be removed from the blade. Above the table the dust is trapped in the kerf.
The insert plate will be stronger w/o holes.
John