Capitol Fireproof Door provides a wide range of steel welded and knockdown frames available in standard, as well as custom sizes. Trims and jamb widths are available to fit every situation. Steel welded frames are available in 12, 14, 16 or 18 gauge, prime-quality, cold-rolled steel. Steel welded frames can be manufactured with attached sidelights and/or fixed transoms. Borrowed lights and trimmed openings are available. Masonry, stud, and Z clip anchors are available. Frames can be punched and dimpled for easy installation.


Welded steel frames are press brake formed true. Sharp jamb and head sections are assembled with a tongue and groove arrangement with miters accurately fitted, fully welded and ground smooth. All frames are accurately mortised for hinge and strike plates according to hardware specifications.

Knockdown frames are constructed with integral tabs that can lock together, as well as compression tabs to lock the frames to the drywall. The tab design prohibits the frame head from rising and keeps all members aligned.

Reinforcement is provided with steel plates that are welded to the frame, precisely drilled and tapped to accommodate template hardware. Reinforcements are also provided as required for door closers, hinges, locks and any other door hardware.

Angle spreaders are welded to the bottoms of frames to assure safe shipment and perfect alignment, ready for setting in the field.

A minimum of 3 anchors per frame leg is provided for securing the frames to the walls, along with floor anchors.

Various anchoring systems are available, including wood stud anchor z-clips, compression anchors, and corrugated anchors for masonry and punch and dimple high hats to accept expansion bolts for masonry.