A somewhat unconventional, but effective, method to significantly increase suction on a shop vac involves connecting two vacuums in series. This leverages the power of both machines to boost the overall suction lift.
Here's how it works:
- Primary Vacuum: Designate one shop vac as the primary unit. This will be the vacuum that initially collects the debris.
- Secondary Vacuum: The second vacuum will act as the booster.
- Connecting the Vacuums: Carefully connect the exhaust port of the primary vacuum to the intake port (where you'd normally attach the hose) of the secondary vacuum. You may need to use adapters or creative hose connections to achieve a secure and airtight seal.
Expected Suction Increase: This method aims to combine the lifting power (measured in inches of water lift) of both vacuums. You can expect roughly 80% of the sum of the two individual vacuum's water lift capacities. So, if each vacuum has a water lift of 70 inches, you might achieve a combined lift of around 112 inches (0.8 * (70 + 70)).
Important Considerations:
- Sealing: Ensure a completely airtight connection between the exhaust of the primary vacuum and the intake of the secondary vacuum. Any air leaks will drastically reduce the effectiveness of this method.
- Heat Management: Running two vacuums in series can generate significant heat. Monitor the vacuums and allow them to cool down periodically to prevent overheating or damage. Modern shop vacs usually have thermal overload protection, but it's still wise to be cautious.
- Noise: Expect a considerable increase in noise levels. Ear protection is highly recommended.
- Practicality: While effective, this method can be cumbersome and requires careful setup. Consider whether the increased suction is worth the effort and complexity.
Alternative Methods (if series connection isn't feasible):
While the series connection provides the most dramatic lift increase by far, you can take other steps to maximize the suction of a single shop vac unit:
- Check and Clear Blockages: Ensure the hose, wand, and intake port are free from obstructions.
- Empty the Canister: A full canister significantly reduces airflow and suction.
- Clean or Replace the Filter: A dirty or clogged filter restricts airflow. Clean reusable filters regularly or replace disposable filters when needed.
- Inspect the Hose: Look for cracks or holes in the hose that could be leaking air.
- Ensure a Good Seal: Check that the hose is securely attached to the vacuum and the attachment. Ensure that the lid is properly sealed.
- Use the Correct Nozzle: Some nozzles are better suited for specific tasks. Choose the appropriate nozzle for the material you are vacuuming.
In summary, putting two vacuums in series offers a notable boost in suction. However, it necessitates careful setup, generates more heat and noise, and may not always be practical. Other methods for enhancing suction include checking for obstructions, emptying the canister, and cleaning/replacing the filter.
