Specifiers: 10-Field Fire Door Specification Checklist for SDI/UL/NFPA

Author: Esteban Galicia

Updated:

Fire door specification checklist title card

A compliant fire door specification names the hourly rating and its test or listing reference, a temperature-rise or smoke designation where the application requires one, door construction and frame type matched to the wall condition, glazing limits tied to that listing, hardware preparations with a minimum latch throw, installation limitations, and a permanent traceable label. Cite NFPA 80, the applicable IBC provisions, and the UL or SDI listing behind the assembly.

TL;DR:

  • Matching the door’s hourly rating to the wall is essential, with 20 to 180-minute ratings covering typical wall and enclosure types in accordance with SDI guidance.
  • The specification must require a permanent, traceable label on each door, listing the rating, certifying agency, test standard, and temperature-rise classification when applicable.
  • Door schedules should identify each opening with specific details such as size, construction, hardware, glazing limits, and listing references, avoiding generic or implied requirements.
  • Hardware selections, including hinges, latch throw, and fire exit devices, must be specified to match the rated assembly, with all components tested and listed for fire performance.
  • Complying with NFPA 80 and the applicable codes, including correct installation clearances, anchorage, gasketing, and positive-pressure testing, is critical to maintaining the assembly’s listing and fire safety.
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Table of Contents

Fire-Resistance Ratings and Appropriate Applications

The hourly rating is the first decision in any specification, and it has to match the wall it sits in. The common ratings are 20, 45, 60, 90 and 180 minutes, and SDI technical guidance ties each one to a typical wall condition: 20-minute doors for corridor and smoke-control partitions, 45-minute doors for 1-hour walls, 60-minute doors for 1-hour occupancy separations, 90-minute doors for 2-hour walls, and for stair or elevator enclosures, and 180-minute doors for 4-hour fire walls. The maximum swinging door rating available is 180 minutes, even where the wall itself carries a higher rating.

This produces what practitioners call the three-quarters rule: a door rating is frequently set at roughly three-quarters of the wall’s rating rather than matched one to one, a relationship documented in SDI 118. A 4-hour wall takes a 3-hour door. A 2-hour wall takes a 90-minute door. The exceptions matter as much as the rule, and a specification should state them rather than leave them implied.

  • Smoke and draft control assemblies carry an “S” label in addition to the hourly rating, required wherever the code calls for limiting smoke passage, not just flame spread.
  • 20-minute doors without a hose-stream requirement are a distinct category from standard 20-minute rated doors and must be called out separately when the project allows them.
  • Positive-pressure testing under UL 10C applies to most modern swinging fire door assemblies, and the specification should reference that test category explicitly rather than assume it.
  • Stair and elevator shaft doors typically require 90-minute ratings regardless of the surrounding wall assembly, so the schedule should flag those openings individually.

Getting the rating right at this stage prevents a cascade of problems later: glazing limits, hardware options and even frame gauge all depend on the hourly rating selected here.

Labeling, Certification Marks and Temperature-Rise Designations You Must Specify

A specification is only as good as the label it requires on the finished product. Field labeling guidance from Intertek confirms that a compliant specification should require a permanent, traceable label or certification mark on every door and frame, not a generic reference to “fire-rated construction.”

The label itself needs to carry specific data, and the written specification should state exactly what must appear on it:

  • The hourly fire-resistance rating of the assembly.
  • The name of the certifying or listing agency, such as UL or Intertek.
  • The test standard the door was evaluated against.
  • A temperature-rise classification, where the application requires one.
  • A smoke and draft “S” designation, where applicable.
  • A manufacturer identifier or serial number that supports traceability back to the production record.

Temperature-rise doors are commonly assigned qualitative rating levels such as low, medium, or high temperature-rise classifications, and Intertek’s field labeling guidance notes these are typically indicated on the label. The 250°F classification is the most restrictive and is typically required on doors protecting stairways serving as the primary means of egress in taller buildings, where limiting heat transfer to the escape path matters as much as blocking flame.

Factory labels get lost to repainting, replacement, or field modification more often than most specifiers expect. When that happens, the specification should require field labeling by a qualified agency rather than leaving the opening unlabeled. That clause alone can save a project from a failed final inspection.

Field labeling process for fire doors

Specification Checklist for Written Schedules and Contract Documents

A door schedule is where the specification becomes enforceable. Each opening needs its own line, and each line needs the following fields filled in, not left as a generic “fire door” callout:

  1. Tag or identifier matching the door number shown on the floor plans.
  2. Door type and construction, including gauge, core material and face sheet configuration.
  3. Nominal size and handing, stated as width by height with left-hand or right-hand swing noted.
  4. Frame type and substrate condition, specifying whether the frame is knock-down or welded and what wall assembly it anchors into.
  5. Hourly rating and listing reference, citing the UL, Warnock Hersey (WH), ETL, or SDI number behind the assembly.
  6. Glazing limits and listing reference, including maximum vision panel size permitted at that rating.
  7. Smoke and temperature-rise requirements, noted only where the application demands them.
  8. Hardware set reference and minimum latch throw, cross-referenced to the hardware schedule.
  9. Installation reference and listing limitations, pointing to the manufacturer’s labeled installation instructions.
  10. Special field modification notes, covering any site-specific condition that deviates from standard factory configuration.

Pairs of doors need extra attention in the schedule. An astragal, a coordinator, and the sequence of closing both leaves all affect whether the pair retains its listing, so the schedule should note the coordinator device and astragal type rather than assume the hardware set covers it by default. Every line in the schedule should also point back to the manufacturer’s labeled installation instructions, since an installer who deviates from those instructions can void the listing even on a correctly specified door.

Materials and Hardware Requirements to Specify

Hardware choices are not cosmetic on a fire-rated opening. They are part of the listing, and the specification has to treat them that way.

Hinges on fire-rated doors are steel, ball-bearing, and sized to the door weight and frequency of use. SDI 118 ties hinge leaf thickness to door size and traffic, and heavy-weight hinges become necessary on larger or high-cycle doors where standard-weight hinges would wear prematurely and compromise closing force.

  • Latch throw minimums are typically longer on paired doors than on single openings, and the schedule should state the exact dimension rather than defaulting to standard hardware.
  • Deadbolts are restricted or prohibited on doors serving as a means of egress, since they can block free exit even when the door itself remains functional.
  • Fire exit hardware must carry its own labeling for panic-load performance and cycling, separate from the door’s own label, and the specification should require that the exit device be listed as compatible with the specific door and frame combination.
  • Closers must be sized to the door’s weight and width, since an undersized closer that fails to fully latch the door is one of the most common items flagged during inspection.

Pro Tip: Reference the exact hardware set number in both the door schedule and the hardware schedule, so a substitution during procurement cannot quietly change the latch throw or hinge weight without triggering a review.

For high-cycle commercial openings, calling out ANSI/BHMA cycling-tested hardware in the specification avoids early wear that can compromise fire performance well before the door’s expected service life ends.

Glazing Limits, Vision Panels and Positive-Pressure Considerations

Glazing is one of the first things a reviewer checks against the listing, because allowable vision panel area shrinks as the hourly rating climbs. A 90-minute door permits far less glazed area than a 20-minute door, and the limit is tied directly to the listing, not to a general rule of thumb.

  • State the maximum glazed area and the maximum dimension of any single light, matched to the door’s listing reference.
  • Reference the glazing manufacturer’s own listing for the glass and frame kit used, since the glazing assembly carries its own certification separate from the door.
  • Note any restriction on glazing placement relative to the door’s structural reinforcement or hardware preparation.

UL 10C positive-pressure testing governs most swinging fire door assemblies installed today, and the specification should reference that test category directly rather than assume it by default. Positive-pressure tested assemblies fall into categories that guide component selection and installation detailing, so citing the applicable category in the specification helps the installer select compatible hardware and glazing without guessing. Installation of glazing frames should follow the manufacturer’s own labeled instructions, since field modification of a glazing bead or stop can void the opening’s listing even when the glass itself is correctly rated.

Installation, Applicable Codes and Jurisdiction Notes

A specification earns AHJ acceptance when it cites the right documents by edition, not just by name. The core references are NFPA 80 for installation and maintenance, the applicable edition of the International Building Code, NFPA 101 where life safety provisions apply, and the UL test standard behind the specific listing. Code editions change, and an AHJ working from a newer edition than the one cited in the specification can reject the submission outright, so the specification should state the edition year alongside each reference.

NFPA 80 sets the installation details that the specification needs to require explicitly:

  • Clearances between the door and frame, typically a fraction of an inch, stated per the door’s listing.
  • Frame anchorage method appropriate to the wall substrate, whether masonry, steel stud or concrete.
  • Gasketing or intumescent seals where the listing requires them for smoke or temperature-rise performance.
  • Labeled hardware installed exactly as listed, with no substitution of unlisted components.

For projects outside the United States, the hourly rating system does not translate directly. Australia’s National Construction Code expresses fire resistance through an FRL system covering structural adequacy, integrity and insulation separately, written in a format such as “-/60/30,” and references AS 1905.1 and AS 1530.4 rather than the UL hourly system used domestically. A specification for a multinational project portfolio has to state which system governs each jurisdiction rather than assume one system applies everywhere.

Inspection, Maintenance and Field Labeling Expectations

Inspectors see the same deficiencies repeatedly, and a specification that anticipates them saves callbacks. HUD’s NSPIRE standard for fire-labeled doors documents the recurring issues: doors that fail to close and latch on their own, damaged or missing gasketing, holes cut into the door face for hardware or signage, labels painted over or removed entirely, and objects wedged against the door that prevent full closure.

  • Require the door to close and latch under its own closer without manual assistance, confirmed during commissioning.
  • Require gasketing and seals to remain intact and unpainted, visible for inspection at handover.
  • Require the label to remain legible and unpainted, with its location noted on the shop drawings.
  • Prohibit field-cut holes for hardware not included in the original listed configuration.

NFPA 80 defines a “Qualified Person” authorized to conduct fire door inspections, and HUD’s NSPIRE guidance builds its deficiency criteria around that same inspection framework. When a factory label is missing or a door has been modified beyond its listed configuration, field labeling by a qualified agency becomes the path back to compliance, and the specification should name that contingency rather than leave it to be discovered during a failed inspection.

The specification should also require a maintenance plan: inspection reports dated and filed, corrective actions logged, and a record retained on-site for the AHJ to review. That record-keeping requirement does more to preserve a listing’s validity over the building’s life than any single hardware choice.

How Ufdoors Supports Specifiers Meeting These Requirements

We provide fire-rated steel doors and hollow metal frames built to the ratings and labeling requirements covered above, and we offer prompt delivery options for projects on a compliance deadline. Beyond supply, we assist with inspection and repair work, so a door that fails a field check has a direct path to correction rather than a prolonged procurement cycle.

Our resource center on fire-rated door ratings and requirements carries technical data suited to supporting specification language and cross-referencing against manufacturer installation instructions. For a 90-minute steel door slab, our 32 x 84 single cylindrical prep slab product page lists the gauge, prep and listing details a specifier would cite directly in a door schedule, and matching 30x84 and 34x84 slabs cover adjacent nominal sizes on the same project.

Author Perspective: Practical Specification Pitfalls to Avoid

The failures I see repeatedly are small, not fundamental. A label gets specified but not its required location on the door face, so the installer puts it where it gets hidden by a kick plate. A latch throw dimension gets left to “standard hardware” instead of a stated figure, and the pair fails inspection because the throw is too short for the gap. Glazing limits get written as “per code” instead of a specific maximum, which tells an installer nothing usable.

The fix is almost always the same: tie the manufacturer’s labeled installation instructions and the label’s traceability number directly into the procurement documents, not just the drawings. An AHJ reviewing a submission with that level of detail moves faster, because there is nothing left to interpret.

— Esteban

Where to Source Compliant Fire-Rated Door Assemblies

Specifying the right fields only matters if the assembly you procure actually matches them. The 90-minute steel door slabs referenced in this specification guide are available from suppliers who also provide matching frames and installation, inspection and emergency replacement services for urgent deadlines.

32 x 84 Steel Door Slab, Single Cylindrical Prep – 20 Gauge, Fire-Rated - 90 Min

  • A matching 30 x 84 slab and 34 x 84 slab cover adjacent nominal openings in the same product line.
  • Structural design partners at INTEGRA Consulting cover code-compliant steel detailing worth reviewing alongside your door schedule.

Browse our full catalog of fire-rated doors, frames and hardware or reach out for a technical data sheet on any listed assembly.

FAQ

What are the requirements for a fire-rated door?

A fire-rated door requires a permanent, traceable label showing its hourly rating, certifying agency and test standard, along with hardware, glazing and frame components that are listed compatible with that rating. Installation must follow NFPA 80 requirements for clearances, anchorage and gasketing to keep the listing valid.

How thick is a 20-minute fire-rated door?

Door thickness varies by manufacturer and core construction rather than a single fixed dimension, since the rating comes from the tested assembly as a whole, not the slab thickness alone. A 20-minute door is typically specified for corridor or smoke-control partitions and does not always require a hose-stream test, per SDI technical guidance.

What are the specifications for a 30-minute fire door frame?

A frame paired with a 30 or 45-minute door must carry its own matching listing reference, anchored to a wall assembly rated to accept it, commonly a 1-hour wall per SDI 118. The specification should state the frame’s substrate condition, anchorage method and glazing limits alongside the door’s own rating.

What is the code for a fire-rated door?

Fire-rated doors are governed primarily by NFPA 80 for installation and maintenance, the International Building Code for occupancy-based rating requirements, and the specific UL or SDI test standard behind each listed assembly. Jurisdictions outside the United States, such as Australia, use a separate FRL system under their own national construction code rather than the hourly system referenced here.

Can Ufdoors supply a 90-minute rated door that meets these specification requirements?

Yes, our 32 x 84 90-minute steel door slab and matching 30x84 and 34x84 sizes carry the gauge, prep and listing details needed for a compliant door schedule. We also provide installation and inspection services to keep the assembly’s listing intact after it ships.

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