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2. Central vacuum cleaner - Wikipedia

   en.wikipedia.org/wiki/Central_vacuum_cleaner

   "Wet vacuum interceptor" accessories are available for some systems; these operate by separating liquids from the dirty airstream before passage into the in-wall piping and central unit. These "wet vac" units are subject to the same limitations as "wet-or-dry shop vacuums", and must be washed out and dried after use to prevent unpleasant odours ...

3. High-volume low-speed fan - Wikipedia

   en.wikipedia.org/wiki/High-volume_low-speed_fan

   A High-volume low-speed fan. A high-volume low-speed (HVLS) fan is a type of mechanical fan greater than 7 feet (2.1 m) in diameter. [1] HVLS fans are generally ceiling fans although some are pole mounted. HVLS fans move slowly and distribute large amounts of air at low rotational speed– hence the name "high volume, low speed."

4. Shop-Vac - Wikipedia

   en.wikipedia.org/wiki/Shop-Vac

   Shop-Vac was founded by Martin Miller in 1953 under Craft Tool Company of New York. Miller wanted to replace the broom and dust pan in his workshop with a vacuum cleaner capable of collecting wood and metal chips too large for a conventional machine.

5. Popular oscillating fans to beat the heat - AOL

   www.aol.com/popular-oscillating-fans-beat-heat...

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6. Fan (machine) - Wikipedia

   en.wikipedia.org/wiki/Fan_(machine)

   A household electric fan A large cylindrical fan. A fan is a powered machine that creates airflow. A fan consists of rotating vanes or blades, generally made of wood, plastic, or metal, which act on the air. The rotating assembly of blades and hub is known as an impeller, rotor, or runner. Usually, it is contained within some form of housing ...

7. Axial fan design - Wikipedia

   en.wikipedia.org/wiki/Axial_fan_design

   An axial fan is a type of fan that causes gas to flow through it in an axial direction, parallel to the shaft about which the blades rotate. The flow is axial at entry and exit. The fan is designed to produce a pressure difference, and hence force, to cause a flow through the fan. Factors which determine the performance of the fan include the ...