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Figure 1: Components of a centrifugal fan An external motor belt driven inline centrifugal fan discharging inline to the exterior of a building through a duct. Unlike non-inline/non-concentric impeller casing design with a cutoff blade above, the concentrically symetric cylinder casing and impeller geometry of inline type redirects the outflow around so that it is parallel to the inflow of gases.
From the Great Depression of the 1930s, until the introduction of electric air conditioning in the 1950s, ceiling fans slowly faded out of vogue in the U.S., [2] almost falling into total disuse in the U.S. by the 1960s; those that remained were considered items of nostalgia. Late 1980s Usha Prima, one of the most common ceiling fans in India
In 1965, Liebert founded Liebert Corporation as the first manufacturer air conditioning units with temperature and humidity controls specific for computer room applications. [3] In 1977, Liebert launched Conditioned Power Corporation to design and manufacture power distribution, conditioning and monitoring systems for the data processing industry.
Window and central air conditioning in the 1960s caused many companies to discontinue production of fans, [12] but in the mid-1970s, with an increasing awareness of the cost of electricity and the amount of energy used to heat and cool homes, turn-of-the-century styled ceiling fans became popular again as both decorative and energy-efficient.
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