Why the Label on a Fire-Rated Frame Is Not Just a Sticker
This article covers two closely related compliance topics that trip up installers, inspectors, and facility teams alike: how fire-rated frame labels must be applied and preserved, and what field modifications -- particularly cuts and preps -- are and are not permitted on labeled hollow metal frames. Whether you are managing a school construction schedule, overseeing a healthcare renovation, or closing out an industrial project, these rules affect your inspection and your certificate of occupancy.
What a Fire Frame Label Actually Certifies
A fire-rated hollow metal frame label -- typically a tin (metal) embossed tag applied by the manufacturer -- identifies the assembly as tested and listed for a specific fire rating. That listing is tied to the frame as it left the factory: its gauge, profile, anchor type, hardware preparations, and construction method.
The label does not certify the frame in isolation. It certifies the assembly -- frame, door, hardware, and installation method -- as a system. Altering any of those components in ways not addressed by the listing can void the label, even if the frame itself looks undamaged.
Painted Labels Are Acceptable -- and Intended
A question that comes up repeatedly on job sites: can you prime and paint over an embossed metal frame label? The answer, confirmed by both Underwriters Laboratories and Intertek Testing Services in letters available from manufacturers such as Curries, is yes. In fact, Curries factory policy is to apply metal frame labels before prime paint and finish coat at the factory specifically to reduce the risk of the label rusting when exposed to the elements.
The embossment on a tin label is deep enough to remain legible after painting. If a building owner or inspector objects to a painted label in the field, the manufacturer can provide written confirmation from the listing agency that painting is an accepted practice. Keep that documentation in your project file.
Field Cutting: What Is Permitted and What Is Not
Field cutting on fire-rated hollow metal frames is a subject where many installers operate on assumption rather than documented rules. Here is the practical breakdown.
CCW (Stick) Frames Are Designed for Field Cutting
Continuous weld wall (CCW) stick-length frame components -- used in curtainwall and storefront-style hollow metal systems -- are shipped from the factory at standard lengths (typically 10 feet 6-5/8 inches) and are explicitly intended to be field-cut to the required opening height or width. This is part of the product system design, not a workaround.
However, even on CCW stick components, the field cut must produce a clean, square end that allows the frame profile to function as the listing requires. Rough cuts that distort the profile, expose raw edges without proper treatment, or compromise anchor engagement can affect the assembly's compliance.
Prepped Labeled Frames: Do Not Cut Beyond the Prep
When a fire-rated hollow metal frame has been factory-prepped -- for hinges, strikes, closers, or other hardware -- the prep locations are part of the listed assembly. Field modifications that move, enlarge, or add preps outside the listing's scope require careful evaluation. Common situations that create compliance risk include:
- Cutting a frame shorter after it has been labeled and prepped -- this can move hardware locations outside the positions covered by the listing and can remove anchor engagement points required by the fire assembly.
- Field-adding a hardware prep not included in the factory order -- strikes, electric strike pockets, and additional hinge mortises all affect the frame's structural integrity and the assembly's compliance.
- Field-modifying the stop to accommodate a gasket or seal product not listed for use with that frame profile.
The governing standard is NFPA 80, which requires that fire door assemblies be installed and maintained in accordance with the listing. Modifications not covered by the listing must be reviewed with the Authority Having Jurisdiction (AHJ) before work proceeds.
Electric Strike Preps in Fire-Rated Frames
Electric strike installation in fire-rated frames adds another layer. The electric strike itself must be listed for use on fire-rated assemblies -- not all electric strikes carry that designation. On fire-rated frames with electric strike preps, drywall (where applicable) must penetrate the frame throat by a minimum of 1/2 inch, and the prep must align with the listed hardware location. Field-cut or field-relocated electric strike pockets that were not part of the factory order are a common source of inspection failures in healthcare and school projects.
KD Frame Corners: A Specific Fastener Requirement You Cannot Skip
Knockdown (KD) fire-rated frames -- both masonry and drywall profiles -- carry a specific requirement tied directly to their UL listing: each corner assembly requires an #8 screw at each corner joint. This fastener is not optional and is not interchangeable with a field substitute. Missing it means the frame is not assembled to listing requirements, regardless of how solid it looks. Flag this on every KD fire-rated frame order and verify it at installation.
Practical Takeaways for the Field
- Do not remove or deface the embossed metal label -- painting over it is fine and factory-intended; defacing or removing it is not.
- Match your field cuts to the system design: CCW stick frames are cut-to-fit; prepped labeled frames are not.
- Any field modification to a prepped fire-rated frame that was not part of the factory order requires AHJ review before you proceed.
- Verify electric strike listings separately -- the frame prep and the strike must both be listed for the fire rating required.
- Confirm the KD corner fastener requirement on every fire-rated KD frame before the crew closes the wall.
- Keep manufacturer label documentation (including listing agency letters on painted labels) in your project closeout file -- inspectors ask for it.
Sourcing Frames and Hardware That Support Compliance
Specifying the right frame starts with understanding what the opening requires: fire rating, wall type, hardware preps, and any specialty requirements such as acoustical seals, integrated weatherstrip, or electrified components. Frames from manufacturers such as Curries (an ASSA ABLOY brand) are factory-labeled and prepped to listing requirements, reducing the field modification risk that creates inspection problems downstream.
For hardware on fire-rated frames, DoorwaysPlus carries listed products across categories including hinges, closers, exit devices, electric strikes, and gasketing from preferred lines including Hager, Rockwood, Pemko, Corbin Russwin, Sargent, and McKinney. When the spec calls for a listed assembly, every component in that assembly needs to carry the appropriate listing -- and we can help you verify that before the order ships.
Have a frame question, a field situation, or a cross-reference need? Contact the team at DoorwaysPlus.com -- we work through these details every day.