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Beater Bar

A component of a revolving brush roll that beats the carpet to bring up fine dust and soils from deep in the pile where it can be brushed from the surface and removed by the suction of the vacuum cleaner. Beater bars can be actual metal or plastic bars that are inserted into the revolving brush roll just like agitator brushes or they may be molded into the revolving brush roll in a wide variety of configurations. Stiff bristled agitator brushes can also produce a beating action.


In the cleaning industry this term typically refers to toxins produced by living organisms and may include toxic molds, toxins produced by bacteria, algaes, etc.

Bleeder Valve

See "Suction-Control Air Vent".

British Allergy Foundation

The British Allergy Foundation was formed as a registered charity in 1991 by a group of leading medical specialists determined to improve awareness, management and treatment of allergy. In May 2002 the operational name of the Foundation was changed to Allergy UK.

Brush Control

This is a feature on Dyson uprights that allows the user to turn off the revolving brush at the touch of a button to protect delicate rugs and bare floors.

Brush Roll

The brush roll is the revolving brush that provides the agitation or brushing action on the carpet fibers. Sometimes known as an agitator or revolving brush, it may be made of wood, metal or plastic resin and generally has brushes either molded in or inserted in the form of brush strips (also known as agitator strips) that fit into slots on the brush roll. The brush roll may also include beater bars that may be either molded in or inserted like the brush strips. Brush rolls are found in most upright vacuums and the power nozzles (also referred to as Powerbrushes or Power Heads) of canister vacuums.

Bypass Cooled Motors

By-pass motors utilize a separate, clean air supply to cool the motor. This design eliminates soils or moisture from coming into contact with the electrical components of the motor. A by-pass motor is a must on wet/dry vacuum cleaners. See "Flow-Thru Cooled Motors".

Bypass Motor System

This is a design for upright vacuum cleaners where all the dust and debris that is vacuumed up bypasses the motor. "Traditional" upright vacuum cleaners are designed so that the materials that are picked up actually pass through the fan of the motor before any filtration and then into the dust bag. For this reason they are often referred to as "Dirty Air" or "Direct Air" machines because unfiltered air and soils pass through the motor. This can often result in broken fans and other motor damage. Uprights using the bypass motor design are more reliable, generally require less service and offer longer lasting performance.

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