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Even with dust extraction it's a good idea to wear a p3 rated dust mask. This is because even with a great dust extractor working efficiently and a tool designed to work with them some dust will still be emitted and unfortunately this stuff tends to be ultra fine so won't be trapped by the scillia in your airways and will wind up in your lungs.
To give you an idea; the most efficient tool I own from a dust extraction perspective is my tracksaw. When everything is working 100% (new fleece lined bag, clean filter and no splits in the hose) it will trap approximately 95% of the dust created by my saw.
Obviously it is more of a problem for me as I'm exposed every day I work, but having worked with people who are suffering, and dying, from COPD I'd strongly advise anyone working for a prolonged period in a dusty environment to wear a good quality dust mask or resperator.
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Bobbo
Impressive dust management - having sanded our floors (twice in two years) using belt sanders with just the dust bags that system looks heavenly...no sawdust bogeys for you
What filler are you using for the gaps?