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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."
A ceiling fan is a fan mounted on the ceiling of a room or space, usually electrically powered, that uses hub-mounted rotating blades to circulate air. They cool people effectively by increasing air speed.
In aeronautics, a ducted fan is a thrust-generating mechanical fan or propeller mounted within a cylindrical duct or shroud. Other terms include ducted propeller or shrouded propeller . [ 1 ] When used in vertical takeoff and landing ( VTOL ) applications it is also known as a shrouded rotor .
In August 2019, Qatar Central Bank stated that the country's economic growth will see a boost over the next two years amid expectations of stable oil prices and continued strong exports. The GDP is expected to grow at an average rate of 2.8% between 2018 and 2020, with the budget surplus falling to 4.35 billion riyals in 2019, from a surplus of ...
In a 2010 survey of Ras Laffan's coastal waters conducted by the Qatar Statistics Authority, it was found that its maximum depth was 12.5 meters (41 ft) and minimum depth was 5 meters (16 ft). Furthermore, the waters had an average pH of 8.05, a salinity of 46.94 psu, an average temperature of 24.6 °C and 6.86 mg/L of dissolved oxygen.
In the administrative divisions of Qatar, zones (Arabic: مَنَاطِق manāṭiq; singular مِنْطَقَة minṭaqa) are the second-highest level of government after municipalities. As of the 2015 census, there were 98 zones across the country. [1] However, several of these zones are not currently in use. [2]