Plenum system

a type of air-conditioning system in which air is passed into a room at a pressure greater than atmospheric pressure


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  • Plenum-ventilation

    noun 1. a system of mechanical ventilation in which fresh air is forced into the spaces to be ventilated from a chamber (plenum chamber) at a pressure slightly higher than atmospheric pressure, so as to expel foul air.

  • Pleo-

    1. a combining form meaning “more,” used in the formation of compound words: pleomorphism. combining form 1. a variant of plio- pleochroism, pleomorphism see pleio-. pleo- or pleio- pref. More: pleocytosis.

  • Pleochroic

    [plee-uh-kroh-ik] /ˌpli əˈkroʊ ɪk/ adjective 1. (of a biaxial crystal) characterized by .

  • Pleochroism

    [plee-ok-roh-iz-uh m] /pliˈɒk roʊˌɪz əm/ noun 1. the property of certain crystals of exhibiting different colors when viewed from different directions under transmitted light. Compare (def 1), . /plɪˈɒkrəʊˌɪzəm/ noun 1. a property of certain crystals of absorbing light to an extent that depends on the orientation of the electric vector of the light with […]

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