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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 (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. Hardware verification language - Wikipedia

   en.wikipedia.org/wiki/Hardware_verification_language

   A hardware verification language, or HVL, is a programming language used to verify the designs of electronic circuits written in a hardware description language.HVLs typically include features of a high-level programming language like C++ or Java as well as features for easy bit-level manipulation similar to those found in HDLs.

4. Big Ass Fans - Wikipedia

   en.wikipedia.org/wiki/Big_Ass_Fans

   The company's focus shifted almost exclusively to fan sales, and the company started doing business under the name HVLS Fan Company. [ 1 ] In 2000, the company initiated a marketing campaign with mailers depicting their fans with a picture of the rear of a donkey and the caption "Big Ass Fan". [ 3 ]

5. Thermal destratification - Wikipedia

   en.wikipedia.org/wiki/Thermal_destratification

   When used in the summer to encourage evaporative cooling, HVLS fans are run forward, blowing air at the floor. When used for destratification in the winter, the fans are run in reverse, blowing air towards ceiling which then circulates around the room. The height at which HVLS fans can be effective is limited compared to axial destratification ...

6. Half-value layer - Wikipedia

   en.wikipedia.org/wiki/Half-value_layer

   A material's half-value layer (HVL), or half-value thickness, is the thickness of the material at which the intensity of radiation entering it is reduced by one half. [1] HVL can also be expressed in terms of air kerma rate (AKR), rather than intensity: the half-value layer is the thickness of specified material that, "attenuates the beam of radiation to an extent such that the AKR is reduced ...

7. Timeline of United States inventions (after 1991) - Wikipedia

   en.wikipedia.org/wiki/Timeline_of_United_States...

   1998 HVLS fan. An HVLS fan ("HVLS" stands for "high-volume low-speed") is a type of rotational mechanical fan that moves large amounts of circulating air. Using 10 overhead airfoil blades in a barn, the HVLS fan was invented in 1998 by Walter Boyd who was challenged to find a better means to reduce the heat stress of dairy cattle which in turn ...