panel
either an opaque glazing material or the operating portion of a sliding glass door.
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panning
a set of extrusions which are fastened to a new window to cover the exterior perimeter of an existing opening in a retrofit application.
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patio room
a modular wall system designed with single pane glass.
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pile
weatherstripping made of fibrous material mounted to a semi-rigid plastic base. Typically used to seal against air and water passage between moving parts in a window or door. Available with or without a center fin of Mylar.
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pivot bar
hardware in a tilt hung window to connect the balance shoe with the operating sash.
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polygon
a multi-side geometric shape with more than four sides, commonly used when referring to a conservatory design.
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prime frame
a window frame which has an extended perimeter leg 1" back from the window exterior plane, which becomes a nailing fin for new construction installation.
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projected window
a window in which the operating vents move out (project out or awning) or in (project in or hopper) from the master frame. Each vent is hinged on the horizontal axis to permit easy operation.
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psf
pounds per square foot - a measurement of air pressure used in window testing, e.g., 1.56 psf (25 mph) or 6.24 psf (50 mph).
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PVC
Poly Vinyl Chloride - in rigid frame/sash members, and in flexible gaskets.
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pyramid
a square base design, typical to skylights, with all four slopes rising to form a point.
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