Marshfield DoorSystems, Inc.

Unit Lock
See Preassembled Lock.

Universal
A term used to describe a lock, a door closer or other device which can be used on doors of any hand without change.

Vertical Spring Pivot Handle
A spring hinge mortised into the heel of a door and fastened to the floor and head with pivots.

Vine streaks (marks)
Scars in wood generally caused by the stems of vines clinging by their hair-like roots to the tree trunk.

Volatile Organic Compound (VOC)
Any hydrocarbon with the exception of methane and ethane with a vapor pressure greater than or equal to 0.1 mm Hg.

Warp
Any distortion in the plane of a door itself and not its relationship to the frame or jamb in which it is to be hung. Warp includes bow, cup, and twist:

Bow: A flatwise deviation from a straight line drawn from top to bottom; a curvature along the width of the door.

Cup: A deviation from a straight line drawn from side-to-side; a curvature along the width of a door.

Twist: A deviation in which one or two corners of a door are out of plane with the other corners of the door.

White Birch
The sapwood of the Yellow Birch tree.

Wood Flush Door
Stressed skin construction consisting of a core, stiles, and rails, and or/edge banding, two face panels, almost all of which are wood, wood derivative materials, or high pressure decorative laminate.

Worm Track or Scar
Groove or resulting scar tissue in wood caused by worms or other borers