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  2. Air door - Wikipedia

    en.wikipedia.org/wiki/Air_door

    A typical commercial air curtain enclosure. In North America, the more commonly-used term for an air door is "air curtain". The American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) defines an air door as follows: "In its simplest application, an air curtain is a continuous broad stream of air circulated across a doorway of a conditioned space.

  3. Revolving door - Wikipedia

    en.wikipedia.org/wiki/Revolving_door

    Diagram of a revolving door, viewed from above. Around the central shaft of the revolving door, there are usually three or four panels called wings or leaves.Large diameter revolving doors can accommodate pushchairs and wheeled luggage racks - such large capacity doors are sometimes H-shaped to split the circle into only two (hence larger) parts.

  4. Portcullis - Wikipedia

    en.wikipedia.org/wiki/Portcullis

    Portcullis at Desmond Castle, Adare, County Limerick, Ireland The inner portcullis of the Torre dell'Elefante in Cagliari, Sardinia, Italy A portcullis (from Old French porte coleice 'sliding gate') is a heavy, vertically closing gate typically found in medieval fortifications. [1]

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  6. Door - Wikipedia

    en.wikipedia.org/wiki/Door

    Door casing, door frame, or chambranle – formed by the lintel and the two jambs. Sill (for exterior doors) – A horizontal sill plate below the door that supports the door frame. Similar to a window sill but for a door; Threshold (for exterior doors) – A horizontal plate below the door that bridges the crack between the interior floor and ...

  7. Air curtain - Wikipedia

    en.wikipedia.org/wiki/Air_curtain

    Air curtain may refer to: Air door, a fan-powered device used for separating two spaces from each other; ... 36 (UTC). Text is available ...

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