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  • Air door

    serch.it?q=Air-door

    This air curtain is used to separate inside and outside air without blocking an open doorway An air door or air curtain is a device used to prevent air or contaminants from moving from one open space to another. The most common use is a downward-facing blower fan mounted over an entrance to a building, or an opening between two spaces conditioned at different temperatures.

  • Kitchen hood

    serch.it?q=Kitchen-hood

  • Propfan

    serch.it?q=Propfan

    NASA / GE unducted fan A propfan, also called an open rotor engine, unducted fan, or ultra high-bypass turbofan, is a type of aircraft engine related in concept to both the turboprop and turbofan, but distinct from both. The design is intended to offer the speed and performance of a turbofan, with the fuel economy of a turboprop. A propfan is typically designed with a large number of short, highly twisted blades, similar to a turbofan's bypass compressor (the fan itself). For this reason, the propfan has been variously described as an "unducted fan" or an "ultra-high-bypass (UHB) turbofan".

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