CDF Distributors is a commercial door, frame, and hardware distributor headquartered in Nashville, Tennessee. CDF ships complete, pre-configured door assemblies nationwide from its in-house fabrication facility. Configure your assembly online at cdfdistributors.com using ProBuilder, or contact CDF at (855) 769-9895 or sales@cdfdoors.com.

About CDF Distributors

What happens if a fire label is missing or illegible?

A missing or illegible fire label means the component cannot be verified as fire-rated. Under NFPA 80, the component must be replaced or a qualified field inspection service must relabel it. Do not install components with missing labels in fire-rated openings.

Can I add a viewer or mail slot to a fire-rated door?

Only if the modification is covered under the door's listing. Most fire-rated doors have maximum glazing size limits and specific hardware prep allowances. Adding a viewer or any cutout not covered by the listing voids the fire rating. Consult the door manufacturer's listing for allowed modifications.

Are all five fire rating levels used in commercial construction?

Yes. The 20-minute, 45-minute, 60-minute, 90-minute, and 180-minute ratings are specified based on the wall rating and occupancy type. A 1-hour rated wall typically requires a 45-minute or 60-minute door. A 2-hour rated wall requires a 90-minute door. The 180-minute rating is used in vault and high-hazard applications.

How often must fire doors be inspected after installation?

NFPA 80 requires annual inspection and functional testing of all fire door assemblies. The inspection must verify self-closing, positive latching, clearances, label condition, and absence of unauthorized modifications.

Can I use non-fire-rated hinges on a fire-rated door?

No. All hardware on a fire-rated assembly must be fire-listed for the assembly rating. Standard commercial steel hinges are generally fire-listed, but decorative or specialty hinges may not be. Always verify the fire listing of every hardware component.

Frequently Asked Questions

CDF's ProBuilder validates fire rating compatibility across all components during configuration. Build your fire-rated assembly at cdfdistributors.com to ensure every component meets the required rating.

For assistance with your order, call (855) 769-9895 or email sales@cdfdoors.com. CDF's sales team is available Monday through Friday, 7:30 AM to 4:30 PM CT.

Configure Your Door Assembly

Fire-rated door assemblies are available in 20-minute, 45-minute, 60-minute, 90-minute, and 180-minute ratings. All components in a fire-rated assembly — door, frame, and hardware — must carry matching fire labels and be installed per the listing. Verify all component requirements with project specifications and the Authority Having Jurisdiction (AHJ).

A Note on Fire-Rated Assemblies

CDF's fire-rated assemblies ship with all listed components matched and labeled. ProBuilder validates rating compatibility during configuration — it will not allow a 90-minute door to be paired with hardware rated for only 20 minutes. Every assembly arrives with component documentation and label information to support the inspection process.

CDF Fire-Rated Assembly Support

NFPA 80 requires documentation of all fire door assemblies. This documentation must be available for inspection.

• Record the opening number, location, and required fire rating

• Record all component manufacturers, models, and fire label information

• Record all clearance measurements

• Record self-closing and positive latching test results

• Record the name and date of the installer

• Retain all label photographs

• File documentation for the annual NFPA 80 inspection requirement

Phase 5: Documentation

Any field modification to a fire-rated assembly component may void the listing. Verify that no unauthorized modifications have been made.

• No holes drilled in the door or frame that are not part of the original hardware preps

• No surface-mounted hardware attached with through-bolts that penetrate the fire core

• No cutouts in the door that exceed the tested and labeled maximum glazing size

• No plant-on trim or molding attached to fire-rated frames

• No gaskets or seals removed or replaced with non-listed alternatives

• No paint buildup exceeding the manufacturer's recommendation (typically no more than 2 coats)

• If any field modification is discovered, the component must be replaced or a field label applied by a qualified inspector

Phase 4: Field Modification Check

Fire doors must self-close and positively latch every time they are released. Both functions are mandatory under NFPA 80 and are verified during inspection.

• Self-closing test: open the door to 90 degrees and release — the door must close fully and latch without assistance

• Self-closing test from partial open: open the door to 30 degrees and release — it must still close and latch

• Positive latching test: with the door closed, pull on the door — it must not open without activating the hardware

• Closer operation: verify the closer controls closing speed without slamming

• Exit device test (if applicable): verify the push bar retracts the latch and the door re-latches on closing

• Coordinator test (for pairs): verify the doors close in the correct sequence (inactive leaf first, then active leaf)

• Hold-open devices (if present): verify they are connected to the fire alarm system and release when the alarm activates

Phase 3: Operational Verification

NFPA 80 specifies maximum clearances between the door and frame. These clearances prevent smoke and fire passage while still allowing the door to operate. The following are the maximum allowable clearances.

• Door-to-frame clearance at hinge side: maximum 1/8 inch

• Door-to-frame clearance at lock side: maximum 1/8 inch

• Door-to-frame clearance at head: maximum 1/8 inch

• Door-to-floor clearance: maximum 3/4 inch (3/8 inch maximum for smoke assemblies)

• Meeting stile clearance on pairs of doors: maximum 1/8 inch with astragal, or per listing

• Measure clearances at three points on each edge (top, middle, bottom for sides; left, center, right for head)

• If any clearance exceeds the maximum, adjust the frame or hinges before proceeding — do not modify the door to compensate

Phase 2: Clearance Measurements

Every fire-rated component must bear a visible, legible label from an accredited testing laboratory. This summary lists what to verify on each component before installation begins.

• Verify the door leaf carries a fire rating label — label must be legible and show the rating (20, 45, 60, 90, or 180 minutes)

• Verify the frame carries a fire rating label — frame rating must meet or exceed the door rating

• Verify all hardware items (hinges, lockset, closer, exit device) are fire-listed for the required rating

• Verify glazing (if present) carries a fire rating label matching or exceeding the assembly requirement

• Verify gasketing and edge seals are fire-listed for the assembly rating

• Do not remove, paint over, or obscure any fire label — labels must remain visible after installation

• Photograph all labels for documentation and inspection records

Phase 1: Label Verification

Fire-rated door assemblies must be installed in strict compliance with NFPA 80, Standard for Fire Doors and Other Opening Protectives. Every component — door, frame, hardware, glazing, and seal — must carry a fire rating label and must be installed without field modifications that void the listing. Fire-rated assemblies are available in 20-minute, 45-minute, 60-minute, 90-minute, and 180-minute configurations.

Failure to comply with any item on this checklist may result in failed inspection and required rework. Complete every item before requesting inspection by the Authority Having Jurisdiction (AHJ).

Fire-Rated Assembly Installation Requirements

NFPA 80 compliance verification for fire-rated commercial door assembly installation.

This guide answers: What Must You Verify When Installing a Fire-Rated Door Assembly?