* Grain-Rings in wood that create a 45 degree angle or greater with surface pieces.
* Lift-When a door lifts vertically without the use of horizontal tracks.
* Lift Drum-A type of cable drum that can neutralize spring tension by changing the radius of its grooves.
* Post-Additional vertical support that aids against episodes of high wind.
* Splice Angle-Employing a continuous angle that reaches the entire height, to connect vertical track to the door jamb.
* Track-The section of track that sits adjacent to the jamb and is vertical.
* Track Assembly-This group is made by a vertical track piece joining with either jamb brackets or a continuous angle piece. It fastens together the track and the jamb.
