When dealing with vacuum, you have 2 main considerations: Actual vacuum (inHg) and flow (cfm). For work holding, flow only comes into play when you have openings in the vacuum circuit. Actual vacuum is your holding power. Dust collectors are designed to have more flow and less actual vacuum. Vacuum pumps are designed to have more actual vacuum and less flow. If you can find a dust collector that gives you the holding power you need, by all means use it.