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A shop vac is only as good as its filter. Using the wrong one can blow dust back into your air or burn out the motor: The Ultimate Shop-Vac Buying Guide | Blain's Farm & Fleet
The Ultimate Guide to Buying Your First Shop Vac: More Than Just a Workshop Tool buy shop vac
This measures the volume of air the vacuum moves. A higher CFM (aim for 75–150+) is better for collecting lighter debris like sawdust and drywall dust. A shop vac is only as good as its filter