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2. Ceiling fan - Wikipedia

   en.wikipedia.org/wiki/Ceiling_fan

   Air naturally stratifies, i.e. warmer air rises to the ceiling while cooler air sinks, meaning that colder air settles near the floor where people spend most of their time. A ceiling fan, with its direction of rotation set so that the warmer air on the ceiling is pushed down along the walls and into the room, heating the cooler air.

3. AB Standard (New York City Subway car) - Wikipedia

   en.wikipedia.org/wiki/AB_Standard_(New_York_City...

   In addition, riders could open the drop sash side windows for extra ventilation. Initially made from wood (2000–2599), on later cars they were brass (2600–2899, 4000–4049). After early complaints about the summer warmth of the cars, ceiling paddle fans were added during the 1919–1920 modifications. Later cars came already equipped with ...

4. Talk:Ceiling fan - Wikipedia

   en.wikipedia.org/wiki/Talk:Ceiling_fan

   Efficacy being defined as "the ability to produce a desired amount of a desired effect", and ceiling fan being defined as "a device suspended from the ceiling of a room, which employs hub-mounted rotating paddles to circulate air in order to produce a cooling effect", the two now match.

5. Centrifugal fan - Wikipedia

   en.wikipedia.org/wiki/Centrifugal_fan

   Figure 1: Components of a centrifugal fan An external motor belt driven inline centrifugal fan discharging inline to the exterior of a building through a duct. Unlike non-inline/non-concentric impeller casing design with a cutoff blade above, the concentrically symetric cylinder casing and impeller geometry of inline type redirects the outflow around so that it is parallel to the inflow of gases.

6. Fan (machine) - Wikipedia

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

   A ceiling fan is a fan suspended from the ceiling of a room. Most ceiling fans rotate at relatively low speeds and do not have blade guards because they are inaccessible and unwieldy. Ceiling fans are used in both residential and industrial/commercial settings.

7. Philip Diehl (inventor) - Wikipedia

   en.wikipedia.org/wiki/Philip_Diehl_(inventor)

   Philip H. Diehl (January 29, 1847 – April 7, 1913) was a German-American mechanical engineer and inventor who held several U.S. patents, including electric incandescent lamps, electric motors for sewing machines and other uses, and ceiling fans.

8. Sports News & latest headlines from every league - AOL.com

   www.aol.com/sports

   Discover the latest breaking news in the U.S. and around the world — politics, weather, entertainment, lifestyle, finance, sports and much more.

9. Axial fan design - Wikipedia

   en.wikipedia.org/wiki/Axial_fan_design

   The stall zone for the single axial fan and axial fans operated in parallel are shown in the figure. [4] The Figure shows the Stall Prone Areas differently for One fan and Two fans in parallel. [4] The following can be inferred from the graph : For the Fans operated in parallel, the performance is less when compared to the individual fans.