Anatomy of a Window
Just what are all those different parts of a window called? Do the terms sash, grill, and muntin have you confused? You are not alone.
Most of us are confused because there are numerous names for each part of the window.
Jamb: Interior sides of window frame
Apron: Piece of wood trim below the window sill
Sash: a single pane of glass enclosed in a frame of wood, or can be divided into multiple panes or lights, each divided by a several mullions
Rails: horizontal pieces of wood in the sash
Stiles: Vertical pieces wood in the sash
Mullion: vertical piece dividing a window
Muntin/Grill:Decorative window dividers that either snap on the interior or are sandwiched between the glass. True divided light windows have individual pieces of glass and are typically only found in older homes.
Sill: horizontal piece forming the bottom of the window frame
Casing/Trim: decorative wood that surrounds the window frame
Pane: glass
Double hung windows: windows with two nearly identical sashes. The top one moves down and the lower one moves up
