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What you should never pick up with a shop vac
Updated
A shop vac pulls everything it picks up through a fast stream of air, past a filter, and the air leaves through the motor housing. That is fine for sawdust and spilled water. It is a bad place for anything that can burn, anything still hot, and any dust that is dangerous to breathe.
The short list
| Do not vacuum | Why | What to do instead |
|---|---|---|
| Hot or warm ashes and embers | Embers hidden in ash can still be hot, and the tank, filter and bag can burn | Let them cool, then a lidded metal container, kept away from the house |
| Gasoline, solvents and other flammable liquids | Combustible material in a moving air stream next to an electric motor | Follow your local hazardous waste guidance |
| Asbestos, lead paint dust and other hazardous dust | A standard filter passes the finest particles into the room | Purpose built equipment and trained help |
What the makers say
Shop-Vac's FAQ is blunt: do not vacuum toxic, carcinogenic, combustible or other hazardous materials such as asbestos, arsenic, barium, beryllium, lead, pesticides or other health endangering materials. It adds that specially designed units are available for those purposes. Your own vac's manual will have its own warning list. Read it before the first use.
Ashes: only cold, and only with the right filter
Both Shop-Vac and the maker of Vacmaster talk about "cold ashes", and both say they need a fine dust or HEPA cartridge filter. The word cold is doing a lot of work. The U.S. Fire Administration says to allow ashes to cool before disposing of them, to place them in a tightly covered metal container kept at least 10 feet from the home and any other buildings, never to empty them directly into a trash can, and to pour water on them.
If you are not certain the ashes are fully cold all the way through, do not vacuum them. A plastic tank, a paper filter and a dust bag are all fuel. When they are truly cold, fit a fine dust cartridge first. Ash is fine enough to pass a standard filter. See filters and fine dust.
Lead paint and asbestos
The EPA's lead renovation rule requires a HEPA vacuum, and the EPA says that means a vacuum designed around a HEPA filter so that no air leaks past it, rather than a shop vacuum fitted with a HEPA filter. None of the seven picks here is sold as one. If your home was built before 1978 and you are sanding or scraping paint, read the EPA's guidance before you start. This is general information, not legal or health advice.
Water is fine, with care
Wet pickup is what these vacs are built for. Use the foam sleeve, remove the dry filter and bag, plug into a GFCI protected outlet, and keep the plug and any cord connection out of the water. For a flooded room, the power has to be known safe first. See tank size and water pickup.
Things that are fine but hard on the vac
- Drywall dust. Safe for the vac with a fine dust cartridge and a bag. Without them it clogs the filter fast and blows through.
- Long wet jobs. The float will stop suction when the tank is nearly full. That is normal. Empty it and go on.
Run any listing through the peak HP calculator, match a vac to your job with the job checker, or compare all seven picks on the roundup page.