Throat Size and Door Frame Jamb Depth

The throat size for a door frame corresponds directly to the total wall thickness of the partition. While standard profiles suit typical commercial drywall or masonry thicknesses, custom hollow metal frames can be fabricated with custom throat dimensions and jamb depths to wrap exact partition assemblies across diverse construction environments.

Jamb depth represents the overall outside dimension of the frame profile from face to face. The throat dimension is the internal opening that straddles the wall. The difference between overall jamb depth and throat size accounts for the frame stops, faces, and backbends required for structural rigidity.

Custom hollow metal frames are manufactured across multiple steel thickness options, ranging from 16 gauge to 12 gauge steel. Frames can also be ordered in standard steel or A60 galvannealed and stainless steel options depending on structural and environmental project demands.

Yes. UL fire-rated options are available for hollow metal frames, including custom and standard jamb depths. Frame profiles can be manufactured in compliance with UL and NAAMM/HMMA standards to meet strict commercial life-safety and fire-rated egress opening requirements.

Door frames can be supplied as fully finished and precision-welded assemblies or as cut-and-notch knockdown components. Configurations include standard three-sided openings, kerfed frames, sidelite and transom assemblies, double egress systems, and pocket door configurations.

Standard frame production lead times run between five to seven business days. Expedited quick-ship programs are also available, offering fast turnaround options from same-day dispatch up to five business days depending on configuration and availability.