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Window fans are designed to fit into open windows, and often have expandable side panels to cover the entire window opening. Most units have either one large fan, or two small fans mounted side by side. [1] Most window fans have two or three speeds, and some are electrically reversible so that the user can switch between intake and exhaust modes.
Window fans provide an alternate way to enjoy a hot day even while indoors. Window fans are often much quieter than air conditioners, and they’re perfect for bedrooms where oppressive heat might ...
Duracraft was founded in the late 1980s by Tim Chen, Bernard Chiu and Ronald Izen in Southborough, Massachusetts.Duracraft manufactured home appliances such as fans, humidifiers, dehumidifiers and air conditioners in the United States, China, and South America.They were known for selling desk pedestal and window fans.
The WS-10 is reverse engineered from the CFM56 with the experience gained from the Woshan WS-6 turbofan project, which was abandoned at the start of the 1980s. [4] The WS-10 project was reportedly started by Deng Xiaoping in 1986 to produce an engine comparable to the Saturn AL-31.
One of the earliest engines that resembled the propfan concept was the 4,710 pounds-force (21.0 kilonewtons) Metrovick F.5, which featured twin contra-rotating fans—14 blades in the fore (front) fan and 12 blades in the aft (back) fan—at the rear of the engine and was first run in 1946.
The fan diameter of the original series being 123 in (310 cm), and the largest variant GE90-115B has a fan diameter of 128 in (330 cm). As a result, the GE90 engine can only be air-freighted using an outsize cargo aircraft such as the Antonov An-124 , which restricts shipping options if, due to an emergency diversion, a 777 were stranded ...