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2. Whole-house fan - Wikipedia

   en.wikipedia.org/wiki/Whole-house_fan

   A whole house fan pulls air out of a building and forces it into the attic space or, in the case of homes without attics, through an opening in the roof or an outside wall. This forces air from the living areas into the attic and out through the gable and/or soffit vents, while at the same time drawing air from the outside into the living areas ...

3. Kitchen hood - Wikipedia

   en.wikipedia.org/wiki/Kitchen_hood

   A kitchen hood, exhaust hood, hood fan, extractor hood, or range hood is a device containing a mechanical fan that hangs above the stove or cooktop in the kitchen. It removes airborne grease, combustion products, fumes, smoke, heat, and steam from the air by evacuation of the air and filtration. [ 1 ]

4. Cool Down Your Space From Above With These Editor-Recommended ...

   www.aol.com/7-best-ceiling-fans-silent-124800690...

   Save energy while cool down your home with this Hunter Fan Company 44-Inch Ultra Quiet Ceiling Fan. With three long blades, this fan utilizes a soft whisper motor for quiet use with the click of a ...

5. Ventilation (architecture) - Wikipedia

   en.wikipedia.org/wiki/Ventilation_(architecture)

   An axial belt-drive exhaust fan serving an underground car park. This exhaust fan's operation is interlocked with the concentration of contaminants emitted by internal combustion engines. Mechanical ventilation of buildings and structures can be achieved by the use of the following techniques: Whole-house ventilation; Mixing ventilation

6. Graffiti in Toronto - Wikipedia

   en.wikipedia.org/wiki/Graffiti_in_Toronto

   A request for art, or an act of vandalism?The question if graffiti constitutes one or the other has become a topic of debate in Toronto. There has been a debate regarding the issue of graffiti in Toronto as to whether or not graffiti constitutes art or vandalism, with former Mayor Rob Ford vowing to remove all graffiti from the City of Toronto, [7] defining graffiti as "One or more letters ...

7. Ducted fan - Wikipedia

   en.wikipedia.org/wiki/Ducted_fan

   The high-bypass turbofan engines used on many modern airliners is an example of a very successful and popular use of ducted fan design. The duct increases thrust efficiency by up to 90% in most cases [citation needed], in comparison to a similar-sized propeller in free air. Ducted fans are quieter, and offer good opportunities for thrust vectoring.