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2. Ceiling fan - Wikipedia

   en.wikipedia.org/wiki/Ceiling_fan

   In open places where the fan may come in contact with water, one must use wet-rated fans. UL Wet-rated fans have a completely sealed motor which can withstand direct exposure to rainwater, snow and can even be washed off with a garden hose. Both industrial and residential fans come in dry-rated as well as damp and wet-rated varieties. [15]

3. Air Movement and Control Association - Wikipedia

   en.wikipedia.org/wiki/Air_Movement_and_Control...

   AMCA Publication 801 - Industrial Process/Power Generation Fans: Specification Guidelines provides information on testing and rating power plant fans and covers construction features and related accessories. Sample equipment specifications are included which outline the information a fan manufacturer requires to select the best fan for an ...

4. High-volume low-speed fan - Wikipedia

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

   Larger diameter fans can move more air than smaller fans at the same speed. A turbulent, high velocity air jet dissipates very quickly. A large column of air, however, "travels" farther than a small one due to the friction between moving air and stationary air, which occurs at the periphery of the moving column.

5. Specific fan power - Wikipedia

   en.wikipedia.org/wiki/Specific_fan_power

   In reality the fan system efficiency is often in the range 0 to 60% (i.e. <); it is lowest for small fans or inefficient operating points (e.g. throttled flow or free-flow). The efficiency is a function of the total losses in the fan system, including aerodynamic losses in the fan, friction losses in the drive (e.g. belt), losses in the ...

6. Fan filter unit - Wikipedia

   en.wikipedia.org/wiki/Fan_filter_unit

   FFUs are typically manufactured in 4' x 2', 3' x 2', or 2' x 2' steel housings, which can be placed in ceiling grid bays of similar dimensions. [2] Units often contain a pre-filter as well as a HEPA (high-efficiency particulate air), ULPA (ultra-low particulate air) or other MERV (minimum efficiency reporting value) filter.

7. ‘It Ends With Us’ has been read by millions. What do fans ...

   www.aol.com/news/ends-us-read-millions-fans...

   “It Ends With Us” has officially hit theaters. Fans of Colleen Hoover’s 2016 novel, which has sold millions of copies, and newcomers alike took to social media to share their thoughts on the ...