Astragal applications:
Pairs of Doors - Astragal is attached to the vertical meeting edge of one leaf of a pair of doors
Double Egress Applications - Astragals are used on some double egress applications.
Dutch Doors - Astragal is attached horizontally to the bottom edge of the upper (top) leaf of the dutch doors
Flush Transom Panels - Astragal is attached horizontally to the bottom face of the flush transom panel
Single Doors - Astragal is attached to the vertical lock edge of the door overlapping the frame face
Astragals can interfere with hardware applications and door functionality:
Pairs of Doors:
Dutch Doors - usually do not interfere with hardware applications.
Flush Transom Panels: