Shop Vacuum 3931 - Fine Woodworking Tool Review
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Shop Vacuum 3931

Bosch - Shop Vacuum 3931

This Bosch 13-gallon wet/dry vacuum can be activated by an auxiliary power tool, and features a unique filter-cleaning function.

$440 (As of 10/1/2003)

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Editor's Review:

by Roland Johnson

review date: October 1, 2003

The two most important criteria for any shop vacuum destined for use in a woodshop are (1) plenty of power to suck up lots of sawdust and (2) efficient filters, so the collected sawdust does not escape into the shop air. Bosch has entered the shop-vacuum market with a machine that promises both.

On the new Bosch 3931, an 11.1-amp motor provides good suction. When used with the optional 2-1/4-in.-dia. hose, the Bosch did a good job collecting chips from a benchtop thickness planer.

The main filters are positioned above the sawdust in the upper housing. To ensure that the motor is cooled only by clean air, the filter system also includes a set of secondary filters behind the main filters. There's also a clever feature called Pulse-Clean, which gives the filters a vigorous electronic shaking to help dislodge accumulated sawdust and restore suction power. In short, this product has a good filter system.

The Bosch also has an outlet with an auto-start feature. With a maximum rating of 7.2 amps, the outlet should be able to handle most sanders and smaller-horsepower routers. Bosch has eliminated the annoying blast of exhaust air by diffusing the air around the motor housing.

Editor Test Results:

Exhaust Diffused
Noise Rating 74 db.

Manufacturer Specifications

Manufacturer Bosch
Manufacturer's Web Site
Manufacturer's Phone Number 877-267-2499
Controls Auto Start: Yes
Intake Hole Size N/A
Impeller Size N/A
Materials N/A
Size 11.35 gal.
Horsepower 6.5 Max HP
Amps 11.1
Volts 120v
Speed Variable Motor Speed: No

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