What is an astragal?

An Astragal is an applied molding attached most commonly to the meeting edge of doors to:

  1. Protection against weather conditions
  2. Minimize the passage of light between the doors
  3. Retard the passage of smoke, flame or gases during a fire
  4. Add security to the lock and/or strike

Astragal applications:

  1. Pairs of Doors - Astragal is attached to the vertical meeting edge of one leaf of a pair of doors
    • This is the most common astragal application
    • Can be attached to the active or inactive leaf depending on application and function
    • Required on 3 hour pairs of doors
  2. Double Egress Applications - Astragals are used on some double egress applications.
    • Can be attached to either leaf since both leafs are active.
    • Required on 3 hour pairs of doors
  3. Dutch Doors - Astragal is attached horizontally to the bottom edge of the upper (top) leaf of the dutch doors
    • Required on fire rated dutch doors
    • The astragal serves as a coordinator
  4. Flush Transom Panels - Astragal is attached horizontally to the bottom face of the flush transom panel
    • Required on fire rated 1 3/4" thick flush transom panels when used in transom frame without transom bar. Astragal could be specified to minimize light or sound transmission
  5. Single Doors - Astragal is attached to the vertical lock edge of the door overlapping the frame face
    • This application is for security purposes
    • Only supplied when specified

 Astragals can interfere with hardware applications and door functionality:

  1.  Pairs of Doors:
    • A coordinator is required if the active leaf has self latching locking devices
    • Coordinators are not required on Double Egress applications.
    • Overlapping astragals are not permitted in pairs (swing in same direction) with double vertical rod application
    • Auto Operators do not function properly when used when the doors are equipped with astragals.
  2. Dutch Doors - usually do not interfere with hardware applications.
  3. Flush Transom Panels:
    • Vertical Rod strikes may create issues

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