M – P
The opening left in a masonry wall to receive a window or door unit.
Horizontal Intermediate sash members that meet when the window is closed such that they combine to act in unison.
Vertical intermediate sash members that meet when the window is closed such that they combine to act in unison.
Vertical framing member between window units.
An integral extension of a window or patio door frame which generally laps over the conventional stud construction and through which nails are driven to secure the frame in place.
National Fenestration Rating Council.
Any textured glass (frosted, etched, fluted, ground, etc) used for privacy, light diffusion or decorative effects.
A window that can be opened for ventilation.
Framed sheet of glass.
A non-load-bearing window wall that is wholly supported at each storey.
The pressure or stress that arises when a force of one newton is applied uniformly over an area of one square metre.
A part of the window that provides ventilation even when the sash is in the closed position.
A large, fixed window framed so that it is usually, but not always, longer horizontally than vertically to provide a panoramic view.
Window units in which the sash hardware is located near the midpoint of the stile or rail to permit sash rotation.
A thin plastic substrate, sometimes used as the inner layers in a triple or quadruple glazed window.
An opening in a building made prior to the installation of the window.
The plastic interlayer incorporated into laminated glass in order to ensure good adhesion and the mechanical and safety breakage characteristic of the glass.
‘Poly Vinyl Chloride’ is a material used for flexible (or rigid) glazing gaskets and weather seals. Flexibles are soft and can take up variations in tolerances within the window.