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  2. Ceiling fan - Wikipedia

    en.wikipedia.org/wiki/Ceiling_fan

    In other countries, ceiling fans usually come with a warning to install the fan so that the blades are 2.3 meters above the floor or higher, as instructed by the IEC and similar bodies. This rule applies to all "high level fans" [23] including but not limited to ceiling fans.

  3. Lang factor - Wikipedia

    en.wikipedia.org/wiki/Lang_factor

    The Lang Factor is an estimated ratio of the total cost of creating a process within a plant, to the cost of all major technical components. It is widely used in industrial engineering to calculate the capital and operating costs of a plant. [1] [2] [3]