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2. 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."

3. Malleable Iron Range Company - Wikipedia

   en.wikipedia.org/wiki/Malleable_Iron_Range_Company

   Malleable was the first manufacturer to install a circulating fan in an oven designed for home use in 1967. [7] Oil shortages in the mid-1970s gave the company some increase in sales of its Add-a-Furnace wood-burning furnaces. These furnaces were designed to be connected to existing furnaces as a supplementary, or replacement, heat source for oil.

4. Specific fan power - Wikipedia

   en.wikipedia.org/wiki/Specific_fan_power

   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 electric motor, and variable speed drive power electronics. For more insight into how to maximise energy efficiency and minimize noise in fan systems, see ref.1

5. GHD Group - Wikipedia

   en.wikipedia.org/wiki/GHD_Group

   GHD Group Pty Ltd (formerly known as Gutteridge Haskins & Davey) is a global employee-owned multinational technical professional services firm providing advisory, architecture and design, buildings, digital, energy and resources, environmental, geosciences, project management, transportation and water services.

6. Prandtl–Meyer expansion fan - Wikipedia

   en.wikipedia.org/wiki/Prandtl–Meyer_expansion_fan

   The figure shows one such ideal expansion fan. A supersonic expansion fan, technically known as Prandtl–Meyer expansion fan, a two-dimensional simple wave, is a centered expansion process that occurs when a supersonic flow turns around a convex corner. The fan consists of an infinite number of Mach waves, diverging from a sharp corner. When a ...

7. Ducted fan - Wikipedia

   en.wikipedia.org/wiki/Ducted_fan

   In aircraft applications, the operating speed of an unshrouded propeller is limited since tip speeds approach the sound barrier at lower speeds than an equivalent ducted fan. The most common ducted fan arrangement used in full-sized aircraft is a turbofan engine, where the power to turn the fan is provided by a gas turbine.