What installation of the equipment inside ark of machine of 19 inches of levels occupies height to use "U" of a special unit to express, 1U=44.45mm. U is the in-house and effective use space that points to machine ark, the face plate of the standard device that uses ark of machine of 19 inches of levels is to press N commonly the norms of U is made. To a few nonstandard equipment, can pass mostly add comfortable deserve to plate washer loads 19 inches of box and be secured. 42U machine ark is common standard machine ark, outside dividing ark of 42U level machine, 47U machine ark, 37U machine ark, 32U machine ark, 20U machine ark, 12U machine ark, 6U machine ark also is the constant stock up of manufacturer of some machine ark.

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