The "window" on my eye wateringly expensive portable dust extractor (it's definitely NOT a vacuum cleaner that tool makers give a fancy name to so they can charge more for it) is about 10mm². I was sceptical but it does make a big difference.
Probably a dumb question but what would prevent dust exiting through the bleed hole?
The suction wants to pull air into the hole, not expel anything out of it. Dust won’t come out of the hole at all.
@Howard started
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The "window" on my eye wateringly expensive portable dust extractor (it's definitely NOT a vacuum cleaner that tool makers give a fancy name to so they can charge more for it) is about 10mm². I was sceptical but it does make a big difference.