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 is the difference between a door schedule and a hardware schedule?

A door schedule lists every door opening in the project with its size, type, frame, fire rating, and hardware group designation. A hardware schedule is a separate document that details the specific hardware items (hinges, locks, closers, exit devices) assigned to each hardware group. The door schedule references the hardware schedule through the hardware group column.

What does "US32D" mean on a door specification?

US32D is a BHMA (Builders Hardware Manufacturers Association) finish designation for Satin Stainless Steel. It is the most widely specified finish for commercial door hardware because of its durability, corrosion resistance, and neutral appearance. The "US" prefix stands for the United States finish system, and "32D" identifies the specific satin stainless appearance.

How do I know if a door opening requires a fire-rated assembly?

Check the fire rating column in the door schedule. If a rating is listed (20-minute, 45-minute, 60-minute, 90-minute, or 180-minute), the opening requires a fire-rated assembly. Fire-rated openings are required by code in fire barriers, fire walls, corridor walls, stairwell enclosures, and shaft walls. The project specifications and applicable building code determine where fire-rated assemblies are needed.

What does "KD" mean when it appears next to a frame type?

KD stands for Knocked Down. A KD frame ships in individual pieces (head and two jambs) and is assembled on site during installation. KD frames are used when the frame must be installed after the wall is already constructed, which is common in renovation projects and drywall partition walls. The alternative is a welded frame, which ships as a one-piece assembly.

How do I match hardware to a door opening using the door schedule?

Find the hardware group designation in the door schedule for your specific opening (e.g., HW-3 or Group C). Then locate that same hardware group in the hardware specification, typically found in Division 08 71 00 of the project manual. The hardware group listing details every hardware item, its manufacturer, catalog reference, function, and finish for that opening.

Can CDF help interpret a door schedule for my project?

Yes. CDF's sales team routinely works with contractors and facility managers to interpret door schedules and translate them into complete door, frame, and hardware orders. You can send your door schedule to sales@cdfdoors.com or call (855) 769-9895. CDF can also help you configure assemblies through ProBuilder based on your schedule requirements.

Frequently Asked Questions

CDF's sales team helps contractors and facility managers interpret door schedules and translate specification requirements into accurate ProBuilder configurations. Whether you need help identifying frame types, matching hardware groups, or confirming fire rating requirements, CDF can review your project documents and ensure every opening is configured correctly.

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

Fire rating callouts appear throughout door schedules, frame details, and hardware specifications. The fire rating defines how long the assembly must resist the passage of fire and smoke during a standard fire test. Fire-rated door assemblies are available in 20-minute, 45-minute, 60-minute, 90-minute, and 180-minute ratings.

Where Fire Ratings Appear in Specifications

• Door Schedule — A dedicated column lists the rating for each opening. Rated openings display the rating (e.g., "90 min" or "1-1/2 hr"); non-rated openings are blank or marked "NR."

• Frame Details — Fire-rated frame details specify minimum steel gauge, label requirements, and the need for fire-rated glass if the frame includes a borrowed lite.

• Hardware Groups — Fire-rated openings require specific hardware: fire exit hardware instead of panic hardware, self-closing or automatic-closing devices, and positive-latching locksets.

Fire Rating Levels and Typical Applications

• 20-Minute — Corridor doors and smoke barriers in sprinklered buildings where a lower rating is permitted by code.

• 45-Minute — Corridor doors in 1-hour rated corridors. One of the most common ratings in commercial construction.

• 60-Minute — Openings in 1-hour rated fire barriers and shaft enclosures.

• 90-Minute — Openings in 2-hour rated fire barriers, stairwell enclosures, and exit passageways. Required for most stairwell doors.

• 180-Minute — Openings in 3- and 4-hour rated fire walls. Typically found in occupancy separations and property-line walls.

Labeling Requirements

Every component in a fire-rated opening must carry a fire label from a recognized testing laboratory (UL, WHI/Intertek, or equivalent). The door, frame, glass (if any), and hardware must all be listed for the specified fire rating. Mixing unlisted components with listed components voids the assembly rating. The Authority Having Jurisdiction (AHJ) inspects labels during the certificate of occupancy inspection.

Understanding Fire Rating Callouts on Specifications

Door specifications use standardized abbreviations. Misinterpreting an abbreviation can lead to ordering the wrong product. Below are the most common abbreviations found in commercial door schedules and specifications.

Door and Frame Abbreviations

• HM — Hollow Metal (steel door or frame)

• WD — Wood Door

• AL — Aluminum

• FRP — Fiberglass Reinforced Polyester

• PR — Pair (double door opening)

• SGL — Single

• KD — Knocked Down (multi-piece frame)

• WH — Welded Head and Jamb

• NR — Non-Rated (no fire rating required)

• FR — Fire Rated

• STC — Sound Transmission Class

• AHJ — Authority Having Jurisdiction

Finish Designations (BHMA/ANSI Standard)

Hardware and door finish codes follow the BHMA (Builders Hardware Manufacturers Association) system. These are the most frequently specified finishes:

• US3 — Bright Brass, clear coated

• US4 — Satin Brass, clear coated

• US10 — Satin Bronze, clear coated

• US10B — Oil-Rubbed Bronze

• US26 — Bright Chromium plated

• US26D — Satin Chromium plated (one of the most common commercial finishes)

• US32 — Bright Stainless Steel

• US32D — Satin Stainless Steel (the most widely specified commercial hardware finish)

• US630 — Satin Stainless Steel (alternate designation, equivalent to US32D for certain product lines)

• US711 — Duranodic finish (dark bronze anodized aluminum)

For hollow metal doors and frames, finishes are typically specified as factory primer (P1) with a field-applied paint finish, or as a factory-applied powder coat in a specified color.

How Specs Reference Industry Standards

Specifications regularly cite industry standards to define performance requirements. The most common references include:

• ANSI/BHMA A156 Series — Covers all categories of door hardware (locks, closers, hinges, exit devices, etc.). Each sub-number covers a specific hardware type.

• UL 10C / UL 10B — Fire testing standards for door assembly. Products must bear UL or WHI labels to be used in fire-rated openings.

• NFPA 80 — Standard for Fire Doors and Other Opening Protectives. Governs installation, inspection, and maintenance of fire-rated assemblies.

• NFPA 101 — Life Safety Code. Establishes requirements for means of egress, including door hardware in exit paths.

• SDI (Steel Door Institute) Standards — Define construction, dimensional tolerances, and performance requirements for hollow metal doors and frames.

• WHI (Warnock Hersey/Intertek) — An alternative listing agency to UL for fire-rated assemblies.

Common Abbreviations and Finish Designations

The frame type column in a door schedule references a detail drawing that defines the frame profile, material, gauge, and how the frame attaches to the surrounding wall construction. Understanding frame types is essential because the wrong frame profile or anchor type will not fit the wall condition.

Common Frame Profiles

• Flush Frame — The frame face is flush with the wall surface. Used in drywall and masonry applications.

• Cased Opening Frame — A frame without a door, used to finish an opening that does not require a door leaf.

• Drywall Frame (Throat and Backbend) — Designed to wrap around the drywall stud and gypsum board. The throat dimension must match the wall thickness.

• Masonry Frame — Features masonry anchors (wire or T-strap) that embed into mortar joints during wall construction.

• Welded Frame — A one-piece frame that is set in place before the wall is constructed, typically anchored with base clips and jamb anchors.

• Knocked-Down (KD) Frame — A multi-piece frame that ships flat and is assembled on site. Used when the frame must be installed after the wall is constructed.

Anchoring Methods

The frame specification or detail will indicate the anchoring method:

• Masonry Wire Anchors — Bent wire anchors that embed in mortar joints. Specified for masonry walls (CMU or brick).

• Steel Stud Anchors — Compression or snap-in anchors that attach to steel studs. Used in metal stud and drywall construction.

• Wood Stud Anchors — Screw-on anchors for wood frame construction.

• Floor Anchors (Base Clips) — L-shaped or T-shaped clips at the base of each jamb, fastened to the floor.

The wall type determines which anchoring method is required. Always cross-reference the frame type detail with the wall type shown on the floor plan to confirm compatibility.

Interpreting Frame Types and Anchoring Specifications

Hardware groups are the mechanism that connects the door schedule to the hardware specification. Rather than listing every piece of hardware on each door schedule line, the architect assigns a hardware group designation (such as HW-1, HW-A, or Group 1) to each opening. A separate hardware schedule then details every item in that group.

What a Hardware Group Typically Includes

• Hinges — Type, size, quantity, and finish. Butt hinges, continuous hinges, and pivot sets are specified by group.

• Lockset or Latch — The locking function (classroom, storeroom, passage, privacy) and the standard it must meet (ANSI/BHMA A156 series).

• Closer — Surface-mounted, concealed, or overhead concealed. The closer specification references ANSI/BHMA A156.4 and specifies the size (1 through 6) required for the door weight and width.

• Exit Device — Panic hardware or fire exit hardware, referenced by function (rim, mortise, or vertical rod) and applicable UL or ANSI standards.

• Door Stop or Holder — Wall stops, floor stops, or overhead holders specified by group.

• Threshold and Weatherstripping — For exterior openings, the hardware group may include threshold type and gasketing.

Hardware groups allow the architect to reuse a single specification across many openings. If 30 doors all need the same classroom lockset and closer, they all share the same hardware group rather than repeating that detail 30 times.

Reading Hardware Group References

When you see "HW-3" in the hardware group column of a door schedule, turn to the hardware specification (typically Division 08 71 00 of the project manual) and find Hardware Group 3. That section lists every item, manufacturer, catalog reference, and finish for that group. If the project uses a hollow metal distributor like CDF, the hardware group tells CDF exactly which components to include in the assembly.

Understanding Hardware Groups

A door schedule is the master reference document on a construction project that defines every door opening in the building. Architects and specifiers create door schedules to communicate the exact configuration of each opening to the general contractor, door supplier, and hardware installer. Misreading a door schedule can result in incorrect door sizes, wrong frame types, mismatched hardware groups, and failed fire inspections — all of which cause delays and added cost.

A typical door schedule is formatted as a table with columns for each opening. While exact column layouts vary by architect, most door schedules include the following fields:

Standard Door Schedule Columns

• Door Mark — A unique identifier for each opening (e.g., D101, D102). The mark ties the schedule entry to the opening shown on the floor plan.

• Door Size — Width and height in feet and inches (e.g., 3'0" x 7'0"). Pairs of doors are noted with both leaf sizes.

• Door Type — References a door type detail drawing that shows panel configuration, lite (glass) locations, and louver placement.

• Frame Type — References a frame detail showing profile, material, gauge, and anchoring method.

• Hardware Group — A letter or number that maps to the hardware schedule, specifying all hardware items for that opening.

• Fire Rating — The required fire-resistance rating for the assembly (20-minute, 45-minute, 60-minute, 90-minute, or 180-minute), or blank/NR for non-rated openings.

• Finish — A code indicating the door and frame finish (e.g., P1 for primer, US32D for satin stainless steel).

• Remarks — Special notes such as sound ratings, accessibility requirements, or security features.

Each row in the door schedule represents a single opening. On large projects, door schedules can span dozens of pages and include hundreds of openings.

What Is a Door Schedule and Why It Matters

A field reference for reading door schedules, hardware groups, frame types, and finish designations

This guide answers: What Happens If You Interpret Door Schedules Without Professional Review