Spark reduction goes hand in hand with good housekeeping

They may look like flashes of light, quickly here then gone, but sparks are actually bits of very hot metal.

A Sentry Air System spark reducer in the capture hood of a flexible extraction arm.

Our screen-and-mesh spark reducer, shown fitted into the capture hood of a flexible extraction arm, can be cleaned with pressurized air.

One reason we know this is the work of early researcher Robert Hooke. In this case, early means 17th century.

(More info about Hooke at the end of this post.)

Spark reducers can trap or break up the tiny metal bits, causing them to cool.

When cool, the resulting particles can be treated like any other form of industrial by-product — a target of good housekeeping practices.

We offer spark reducers for light grinding applications

Spark reducers are available for our Model 500/550 Series, Model 400/450 Series, and for the Model 300 Roundaire. They are frequently purchased for light grinding applications.

Three Sentry Air Systems fume extractors.

Check the table below to match extraction arms to model.

Table that relates Sentry Air fume extractors to extraction arm diameters.

The reducers’ combination of screen and mesh effectively reduces sparks.

The spark reducers fit snugly into the capture hoods, but they can be removed for cleaning with mild detergent.

Our spark reducers can also be cleaned with pressurized air while they remain in the hoods.

Contact us

If you’re looking for a fume extraction solution for your light grinding application, call us at 800.799.4609. You can also email our applications specialists at or contact them via the feedback form below and on the pages of our website.


Robert Hooke

Three versions of Robert Hooke plus one of his drawings of sparks.

Unfortunately for Robert Hooke and those of us who might like to know him better, no portrait of him has been uncovered; hence, the varied interpretations of his appearance.

There is gossip, however. Read about Isaac Newton’s possible role in The Royal Society’s blog Hooke, Newton and the ‘missing’ portrait