Fire-Rated Metal Doors and Frames Fabrication Guide

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Fire-rated metal doors and frames are fabricated as tested assemblies, where the door leaf, frame, glazing, seals and hardware must match the rating listed in the certified documentation. A fire-rated metal door fabrication project starts with confirming the required rating and then building every component to that specification, not just the door itself. Your fabricator should work from your drawings and the approved assembly data, and state clearly what must be verified on site.

What makes a metal door a fire-rated assembly

A fire door is never just a heavy door. It is a complete assembly: the leaf, the frame, the hinges, the latch, the closer, the seals and any glazing or vision panel. Each element contributes to how long the opening can resist fire and smoke. For that reason, an architect should think in terms of the whole opening rather than the leaf alone.

When you specify, name the assembly and its rating class, and confirm that the proposed components match what was tested or certified for that rating.

Materials and construction details

Steel is the usual material for fire-rated metal doors and frames because it holds its shape well under heat. The frame must be rigid enough to stay square and to hold the door during and after a fire. Core filling, sheet thickness and reinforcement all affect performance, so these must follow the approved assembly.

Steel gauge and frame profile matched to the rating
Intumescent seals fitted to the frame rebate
Reinforced hinge and lock positions
Consistent corner and joint welding

Hardware, closers and seals

Hardware is where many fire door problems start. Hinges, locks, panic devices and closers should be listed for use on fire-rated doors and installed as the assembly requires. A self-closing device is essential so the door shuts fully on its own.

Seals should be continuous around the opening and protected from paint or coating that could stop them from expanding. Clear the specification with your hardware supplier early so the frame is prepared for the exact fittings.

Glazing and vision panels

If the design includes a vision panel, the glazing must also be part of the tested assembly. Fire-resistant glass and its frame detail have their own requirements, and a standard glass panel cannot be substituted. Confirm the glazing type, size and fixing method against the certificate before drawing it on the elevation.

Drawings, documentation and approvals

A good fabrication package includes shop drawings showing frame profile, rebate detail, hardware preparation, seal positions and anchoring. Ask for the certified data for the assembly and keep it in the project file. Architects should review these drawings against the rating required by the project and by the authority having jurisdiction.

Clear documentation avoids disputes at handover and helps the inspector confirm compliance on site.

Installation and on-site checks

Fire doors perform only if they are installed as tested. Frames must be plumb, square and fixed to the wall with the specified anchors, and the gap around the frame must be filled with the approved material. Doors must swing freely, close fully and latch without forcing.

Check that no unapproved modifications, extra holes or substitute hardware have been added during finishing or fit-out.

Frequently asked questions

Can any metal door be upgraded to fire-rated?

Not usually. A door and frame must be made and tested as a fire-rated assembly, so a standard door cannot simply be modified to meet a rating. Check the certified assembly data before ordering.

Do fire-rated doors need a closer?

Yes, in most cases the door must close and latch by itself. The closer and latch must be compatible with the assembly rating.

Can I paint a fire-rated door?

You can finish it, but paint or coating must not block the intumescent seals or the hardware function. Confirm the finish is permitted for the assembly.

What should I send a fabricator to get started?

Send your drawings, the required fire rating, opening sizes, hardware schedule and any vision panel details. The fabricator can then prepare a written specification for your approval.

Common mistakes to avoid

The most common error is specifying the door without the frame, seals and hardware as one tested assembly. Changing a component late in the project without checking the certificate can break the rating.

Our recommendation

Agree the complete assembly and its documentation with your fabricator at the design stage, and require shop drawings for approval before production starts.

Summary

Fire-rated metal doors and frames are tested assemblies, and every part must match the certified rating. Plan the full opening with the fabricator early for a compliant result.

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