Opening made in the exterior walls of a building, with the purpose of giving light and air to the interior and to allow the view to the outside.
Main parts of the F. are:
– the light,
– l’lintel
– the doorposts
– the sill.

Types of windows:
– Vertical doors, its doors are hinged on the vertical sides
– a vasistas, the sash It is hinged on the lower horizontal side
– rocker, the frame mobile ruota attorno ad un asse orizzontale meridiano
– guillotine, l’apertura dellframe avviene mediante scorrimento verticale.
Except the first, other examples present difficulties for facing and for cleaning.

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