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A fan is the component of a vacuum cleaner motor that is spun by the electrical components of the motor in order to create suction and therefore airflow in a vacuum cleaner.
Filter Indicator Display
This is an electric display found on certain vacuum cleaners measures the effectiveness of the exhaust filter. As the filter loads the display informs the user so that it can be changed at the appropriate time to maintain the highest levels of filtration.
This term indicates the percentage of particles that a filter captures as air moves through it. Filtration efficiency is typically stated with regard to a specific particle size. For example, a HEPA filter retains 99.97% (filtration efficiency) of particles 0.3 microns (particle size) or larger. In order to make an informed decision about how well a vacuum cleaner or air purifier cleans the air, both specifications are necessary.
Vacuum cleaners and air purifiers use a variety of different designs and technologies to remove particles and sometimes odors from air flowing through them. These generally consist of a series of filters made from a wide variety of filter media including the dustbag (which may be made from paper as well as an ever increasing type of filter material), glass fibers, activated charcoal, cloth or foam filters, electrostatic filters, cyclonic chambers, water and so on.
Flow-Thru Cooled Motors
A motor design that uses the primary airflow that carries the soil in a vacuum cleaner to also cool the motor. This system is very effective in vacuum cleaners that utilize a "Clean Air" system where this air is highly filtered before it reaches the motor. Air is typically filtered again after the motor to capture any residual dust or carbon soils produced by the motor brushes.