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2. Ceiling fan - Wikipedia

   en.wikipedia.org/wiki/Ceiling_fan

   It is a common mistake for homeowners to replace a light fixture with a ceiling fan without upgrading to a proper junction box. [citation needed] Ultimately, the weight of the fan must be carried by a strong structural element of the ceiling, such as a ceiling joist. Should an improperly mounted fan fall, especially a 22.7 kg cast iron fan, the ...

3. Heating, ventilation, and air conditioning - Wikipedia

   en.wikipedia.org/wiki/Heating,_ventilation,_and...

   In summer, ceiling fans and table/floor fans circulate air within a room for the purpose of reducing the perceived temperature by increasing evaporation of perspiration on the skin of the occupants. Because hot air rises, ceiling fans may be used to keep a room warmer in the winter by circulating the warm stratified air from the ceiling to the ...

4. 9 Dusting Mistakes That Just Lead to More Dust - AOL

   www.aol.com/9-dusting-mistakes-just-lead...

   "Areas such as room corners, ceiling fans, cathedral ceilings, and tops of doorways collect a ton of dust simply because they all are spots that are hard to reach and inconvenient to tackle in one ...

5. London Underground 1973 Stock - Wikipedia

   en.wikipedia.org/wiki/London_Underground_1973_Stock

   The interior was completely remodelled, with changes including the removal of transverse seating, replacement of the original wooden flooring with new floor material, replacement of straphangers with new grab rails, new enclosures for the ceiling ventilation fans, brighter lighting with new diffusers, installation of car-end windows and new ...

6. List of appropriate technology applications - Wikipedia

   en.wikipedia.org/wiki/List_of_appropriate...

   Electrical powered fans (e.g., ceiling fans) allow efficient cooling, at a far lower electricity consumption as airconditioning systems. A solar chimney often referred to as thermal chimney improves this natural ventilation by using convection of air heated by passive solar energy.

7. The best air purifiers of 2025 - AOL

   www.aol.com/lifestyle/best-air-purifiers...

   We put the best air purifiers from Lenovo, Honeywell, Winix, and more to the test to see which held up best (and actually purified the air for you). See what our product scientist has to say.