Parts of a Pella Door
Know the terms of a patio door or entry door.

The door industry has its own language for things, as you might expect. Door manufacturers, door installers, and contractors may all speak to you using a variety of terms.

Learn how Pella defines door parts and components.

Exterior Parts of a Hinged Patio Door

  • Astragal
    A vertical molding that serves as the center post between a pair of hinged door panels.
  • In-Swing
    A hinged-door panel that swings to the inside when opened.
  • Threshold
    A decorative component that lies at the bottom of a sliding or hinged glass door that serves as a transition from the door sill to the interior flooring.
  • Weatherstrip (Not shown)
    A bulb-and-leaf or foam compression system that helps prevent air and water infiltration.

Hardware and Interior of a Hinged Patio Door

  • Hinged Glass Panel
    The glass panel on Designer Series ® patio doors that opens inward to allow access to our snap-in-between-the-glass blinds, shades and grilles.
  • Out-swing
    A hinged door panel that swings to the outside when opened.
  • Multipoint Lock
    A one handle locking system that secures a door at two or more locking points.
  • Strike and Strikeplate
    A metal plate affixed to a door jamb with a hole or holes for the bolt of the door. The strikeplate latches to the strike when engaged.
  • Sweep
    An energy-efficient and weather-resistant weatherstripping system at the bottom of the door that forms a seal against air and water infiltration between the door and the sill.
  • Thumbturn
    The component of a door that extends or retracts with a dead bolt or latch bolt by grasping with the thumb and fingers and turning.

Exterior Parts of a Sliding Patio Door

  • Argon (Not shown)
    An inert, nontoxic gas used in insulating glass units to reduce head transfer
  • Door Roller (Not shown)
    A mechanism located at the bottom of a sliding door that gives the door the ability to slide.
  • Footbolt
    A door-securing bolt that is designed for foot operation and is applied at the bottom of a door.
  • Glass
    A framed sheet of glass within a door panel.
  • Interlocker
    An upright part of a door panel in a sliding glass door which engages with a corresponding piece in an adjacent panel when the door is closed.
  • Sill Track
    The track at the bottom of a sliding glass door frame.

Hardware and Interior Parts of a Sliding Patio Door

  • Fixed Panel
    An inoperable panel of a door. Also known as a passive or inactive door panel.
  • Frame
    The framework that surrounds and supports the entire door system - comprised of the head, jamb and sill.
  • Head
    The main horizontal part forming the top of the door panel.
  • Jamb
    The main vertical parts forming the sides of a door frame.
  • Sill
    The bottom of the frame that rests on the floor.

Hardware and Interior Parts of an Entry Door with Transom and Two Sidelights

  • Cylinder Lock (Not shown)
    A door lock in which a cylinder rotates to move a bolt.
  • Panel
    The part of the door that swings open and closed.
  • Transom
    The fixed glass panel that is installed above the door.
  • Sidelights
    Tall and narrow fixed glass panels that are attached on either side of the door frame.


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