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Commercial Door Diagram – The Parts of a Door

prefinished wood doors single and double

Doors are not merely entryways; they are complex structures with various components that play crucial roles in functionality, security, and aesthetics. The terminology associated with these components can be overwhelming, but fear not!

Here is a comprehensive guide to help you understand the intricacies of commercial door openings, from single doors to double doors and everything in between.

Commercial Openings: Single and Double Doors Understanding the anatomy of a door begins with distinguishing between single and double doors.

Parts of a Door:

  1. Door Opening:

    • The designated area within a frame where doors are installed, available in single or double configurations.
    • Doors crafted from various materials, including wood, hollow metal, stainless steel, aluminum, and more.
    • Specialty doors like double acting, bullet-resistant, fire-rated, hurricane-resistant, and sound-resistant are offered by LaForce. Custom doors and frames can also be manufactured in-house.
  2. Active Leaf/Door and Inactive Leaf/Door:

    • Active leaf opens first and accommodates main operating hardware.
    • Inactive leaf opens after the active leaf and contains a strike to receive the lock/latchbolt of the active door.
  3. Frame:

    • Surrounds the door on three sides, anchored to the wall, and available in various materials.
    • Custom frames designed and manufactured by LaForce to meet specific building needs.
  4. Head (Of Frame) and Jamb (Of Frame):

    • Head is the horizontal portion above the door.
    • Jamb is the vertical frame component on either side of the door opening, forming the frame's perimeter.
  5. Hinges:

    • Vital hardware allowing door swing, available in various types, including mortise, continuous, and spring.
  6. Lock or Lock Set:

    • Complete latch assembly for door closure, including latch mechanism, cylinders, keys, and trim.
  7. Strike:

    • Metal plate or box receiving the bolt or latch of the lock to keep the door shut.
    • Electric strikes available for remote control or access control equipment.
  8. Closer:

    • Device attached to the top of the door regulating and controlling door swing.
    • Mechanical or electromagnetic options; essential for fire-rated doors.
  9. Lite and Lite Kit:

    • Lites or vision panels are glazed openings allowing light passage.
    • Lite kits secure door lite glass in place, available in metal, wood, or veneered options.
  10. Threshold and Sweep:

    • Thresholds close the gap between the door and the floor, aiding smooth transitions.
    • Sweeps, usually vinyl, seal the space beneath the door, keeping out cold air and elements.
  11. Astragal:

    • Strip of material closing gaps between a pair of doors, requiring coordinators for proper sequencing.
  12. Gasketing:

    • Seals the perimeter of the door opening, addressing environmental, sound, light, and smoke/fire control.
  13. Exit Device:

    • Also known as panic hardware, facilitates fast egress during emergencies.
  14. Louver:

    • Series of slats or blades at the bottom, allowing safe air passage through the door.
  15. Protection Plate:

    • Metal plates at the bottom protecting against wear and tear.
    • Various types include Kick Plates, Mop Plates, Armor Plates, and Stretcher Plates.


Whether you're embarking on a new project, replacing locks, or ensuring ADA compliance, CDF Distributors is your go-to source for comprehensive door solutions. Our experts are ready to assist you in navigating the complexities of commercial doors. Contact us today and let's embark on your next project together!






December 1, 2023
Wayne Foreman

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