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HEPA's require decent fans with higher static pressure than what a bathroom fan will probably provide. Depending on how "clean" you want, you may need to perforate the bench deck for adequate flow-thru to avoid particle collection in the stagnation areas near the rear of the bench. I would look for some fan-filter units (FFU's) that integrate a fan and HEPA together in a common case, and then hang a couple on a frame above your workbench. Vertical down-draft hoods generally keeps things cleaner.
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