Bosch - 3931A Shop Vacuum - Fine Homebuilding Tool Review
  • Magazine Departments
    Magazine Departments
  • Design Inspiration
    Design Inspiration
  • All about Roofing
    All about Roofing
  • 7 Smart Kitchen Solutions
    7 Smart Kitchen Solutions
  • Energy-Smart Details
    Energy-Smart Details
  • Read FHB on Your iPad
    Read FHB on Your iPad
  • 7 Small Bathroom Layouts
    7 Small Bathroom Layouts
  • Install a Vinyl Privacy Fence
    Install a Vinyl Privacy Fence
  • 9 Concrete Countertop Ideas
    9 Concrete Countertop Ideas
  • Master Carpenter Videos
    Master Carpenter Videos
  • Video Series: Tile a Bathroom
    Video Series: Tile a Bathroom
  • Basement Remodeling Tips
    Basement Remodeling Tips
  • Deck Design & Construction
    Deck Design & Construction
  • 7 Trim Carpentry Secrets
    7 Trim Carpentry Secrets
  • Clever daily tip in your inbox
    Clever daily tip in your inbox
  • Tips & Techniques for Painting
    Tips & Techniques for Painting
  • Remodeling Articles
    Remodeling Articles
Pin It
3931A Shop Vacuum

Bosch - 3931A Shop Vacuum

The Bosch 3931A shop vacuum features a tool-triggered start mechanism and a 13-gallon capacity

$415.00 (As of 7/1/2007)

> (1 user review) Write a Review

View all photos

Editor's Review: Tool-Triggered Shop Vacs

review date: July 7, 2007

The Bosch 3931A allows you to dial down the power demand of the vacuum motor, thus allocating more amps to the tool you're using. In addition, it has a method of circuit protection called the Power Broker System. To use this feature, subtract the portable tool's amp rating from the supplying circuit. Turn the Power Broker dial to the difference, and the vacuum modifies its draw, allowing you to work within the capacity of the circuit.

The vacuum's tubular-metal rear handles and large rear wheels enable it to be maneuvered much like a hand truck, although its bulk and low ground clearance limit its portability. It can be used without a bag, but a bag is recommended because upending the canister is awkward. Its filter can be upgraded to a HEPA filter.

The vacuum has an automatic feature called Pulse Clean. When the portable tool is shut off, the vacuum remains on for seven seconds to clear the hose of dust. The machine then determines if the filters are dirty and, if needed, sends an electromagnetic pulse that causes the filter to shake, letting debris fall into the canister.

The Bosch 3931A was the only model tested that has a drain plug, ensuring complete release of wet contents.

read full review

Editor Test Results:

Overall Rating Good
Power Excellent
Filtration/Dust Collection Very good
Noise 80 db.; Fair
Empty and Clean Good
Mobility Fair

More In-Depth Information

Tool-Triggered Shop Vacs Online Membership RequiredA crew of carpenters reviews five machines that make cleanup easier by capturing dust before it hits the floor

Manufacturer Specifications

Manufacturer Bosch
Manufacturer's Web Site
Manufacturer's Phone Number 877-267-2499
Weight 45 lb.
Dimensions Hose length: 10 ft.
Intake Hole Diameter 1-1/2 in.
Power 11 amps (full power)
Size/Capacity 13 gal.
Variable Speed N/A
Filter N/A
Impeller Size N/A
Dust bags $6 each
Accessory kit $45
Cord length 26 ft.

Next Article
Next Article: