Doors
Hollow Metal Doors
- Fire-Rated rating
- 20 min to 3 hr
- Notes
- The only door material we supply at every rating level
Rated Openings
Fire-Rated Doors & Frames
Fire-rated doors and frames are commercial openings tested to NFPA 252 or UL 10C and labeled for a fire rating from 20 minutes to 3 hours. The rating belongs to the tested assembly: a labeled door, a labeled frame, hardware listed for fire doors and any listed glazing, installed under NFPA 80. Mills & Nebraska supplies hollow metal, wood and fiberglass fire door assemblies from Orlando and Lakeland, Florida.
Fire rating is an attribute of the opening, not a separate product, so choose the door and frame by material and use, then confirm each one carries the rating the wall requires.
- 20 min to 3 hrDoor and frame ratings
- UL 10C / NFPA 252Positive pressure tested
- NFPA 80Installation and annual inspection
- Intertek CertifiedIn-house labeling for fire and wind
Doors and Frames Available with Fire Ratings
Each product below is available with a fire rating. Open a product for gauges, cores, sizes and specifications.
Doors
Wood Doors
- Fire-Rated rating
- 20 to 90 min
- Notes
- Custom architectural and prehung wood doors
Doors
Fiberglass Doors
- Fire-Rated rating
- 20 to 90 min
- Notes
- Corrosion resistant for salt air, pools and washdown areas
Doors
Glass Light Kits & Vision Lites
- Fire-Rated rating
- 20 min to 3 hr glazing, within listed size limits
- Notes
- Glass size limited by the door's listing
Frames
Standard Welded Frames
- Fire-Rated rating
- 20 min to 3 hr
- Notes
- Rigid frames for stairs, corridors and elevator lobbies
Frames
Knock-Down Frames
- Fire-Rated rating
- 20 min to 3 hr, per listing
- Notes
- Renovations and tenant improvements
Frames
Security Frames
- Fire-Rated rating
- Up to 3 hr
- Notes
- Forced-entry and fire protection in one frame
Fire Rating Levels and Typical Openings
The wall sets the door rating. These are the typical pairings; the project's code analysis and the product listing govern each opening.
| Door rating | Typical wall or opening | Doors available | Frames available |
|---|---|---|---|
| 20 minutes | Corridor walls and smoke barriers | Hollow metal, wood, fiberglass | Welded, knock-down, security |
| 45 minutes | Most 1-hour fire barriers and fire partitions | Hollow metal, wood, fiberglass | Welded, knock-down, security |
| 60 minutes | 1-hour stair and shaft enclosures | Hollow metal, wood, fiberglass | Welded, knock-down, security |
| 90 minutes | 2-hour walls, stair and shaft enclosures | Hollow metal, wood, fiberglass | Welded, knock-down, security |
| 3 hours | 3-hour and 4-hour fire walls and fire barriers | Hollow metal | Welded, knock-down (per listing), security |
What Makes an Opening Compliant
A fire door keeps its rating only when every component matches the listing and the opening is installed and maintained under NFPA 80.
Labeled door and frame
Both the door and the frame carry a fire label for the required rating. Frames use the steel gauge, reinforcement and hardware preparation their listing requires, and the highest ratings often call for a heavier gauge.
Listed hardware
Hinges, latches and closers must be listed for fire doors. NFPA 80 requires fire doors to be self-closing or automatic-closing and positively latching, and panic hardware on a rated door must be fire exit hardware.
Listed glazing
Vision lites must use fire-rated glazing listed for the door's rating and stay within the listing's size limits. In 60-minute and 90-minute doors, the Florida Building Code limits fire-protection-rated glazing to 100 square inches, and larger lites (or glazing in 3-hour doors in fire walls) must be fire-resistance-rated glazing used at the maximum size tested.
Positive pressure and temperature rise
The Florida Building Code, 8th Edition (2023) requires swinging fire doors to be tested under positive pressure (UL 10C). Exit stair enclosures may also need temperature rise doors, rated at 250°F, 450°F or 650°F at 30 minutes.
Installation and inspection
NFPA 80 governs how fire door assemblies are installed and maintained, from acceptance testing of a new opening to the written records kept for the authority having jurisdiction.
In-House Intertek-Certified Labeling for Fire and Wind
Mills & Nebraska is Intertek certified to apply fire and wind labels at our 36,000 sq ft Orlando facility. Doors and frames are fabricated, prepared and labeled in one place, so rated openings do not wait on an outside labeling service before they ship.
Our team checks each opening's door, frame, glazing and hardware against its listing and documents the assembly so it is ready for the NFPA 80 inspection.
See our door and frame fabrication services and certifications.
Hardware for Fire-Rated Openings
Hardware on a fire door must be listed for fire doors and match the opening's rating.
- Fire exit hardware (UL 305)Exit Devices & Panic HardwareRequired where a rated door needs panic hardware
- Self-closing per NFPA 80Commercial Door ClosersClosers listed for fire doors (UL 10C)
- Listed for fire doorsCommercial Door HingesBall bearing and continuous hinges (NFPA 80)
- Positive latchingCommercial Door LocksLocksets listed for fire doors (UL 10C)
Industries That Specify Them
Fire-rated openings are specified throughout these markets:
Healthcare & MedicalFire-rated, smoke-resistant and access-controlled door openings for hospitals, clinics and medical office buildings across Florida.EducationSecure, durable and code-compliant openings for K-12 schools, colleges and university campuses across Florida.HospitalityFire-rated, sound-rated and durable door solutions for hotels, resorts and guest room corridors across Florida.Multifamily & Senior LivingCode-compliant, durable and accessible door systems for apartments, condominiums and senior living communities in Florida.Government & Public SectorCommercial door, frame and hardware packages for federal, state, county and municipal buildings, built for security, life safety and Florida code compliance.Industrial & DistributionHeavy-duty hollow metal doors, frames and hardware for distribution centers, warehouses, manufacturing plants and cold storage in Florida.
Technical Guide and Articles
Fire-Rated Openings: Frequently Asked Questions
What fire rating does a commercial door need?
It depends on the wall, and the door is often rated lower than the wall it sits in. Corridor walls and smoke barriers commonly take a 20-minute door, a 1-hour fire barrier or partition a 45-minute door, a 1-hour stair or shaft enclosure a 60-minute door, and a 2-hour wall a 90-minute door. The project's code analysis sets the requirement for each opening.
Can a fire door be held open?
Only with a device that releases it automatically. NFPA 80 allows a fire door to stand open when a hold-open device, such as a magnetic holder tied to the fire alarm or smoke detection, lets it close and latch on its own in a fire. Wedges, kick-down stops and other manual hold-opens are not permitted.
How often do fire doors have to be inspected, and what is checked?
NFPA 80 requires an inspection and test at least annually by a person who knows the door's operating components. The inspector confirms the labels are legible, the door and frame are undamaged with no unlisted holes or modifications, glazing is intact, clearances are within limits, and the door closes and latches from the fully open position.
Can a fire-rated door also be hurricane-rated?
Yes. Hollow metal door assemblies can carry a fire label and a wind approval at the same time, which suits exterior stair exits and equipment rooms in Florida. Every component, including the anchors, has to match both the fire listing and the wind approval, or one of the ratings is lost.
Price Your Fire-Rated Openings
Send your door schedule and our team will match doors, frames, hardware and glazing to each opening's rating before anything is fabricated.