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Sounds like a very good idea and I shure will try it
on my next project and will give you a report.
This is a great idea, exept, it doesn't help with the back of the blade where the teeth are coming up and can throw some dust back up and toward the operator. If you put a similar opening at the rear of the blade, it will help to get some air flow at the rear of the blade to help with getting that dust prior to the teeth of the blade coming back up.
Muy buena idea