Parts and Hardware
Understanding UL and WHI listing requirements for fire-rated door assembly components
This guide answers: How Fire-Rated Door and Hardware Combinations Affect Assembly Listing Compliance
How Fire-Rated Listings Work
Every fire-rated door assembly must comply with a specific listing in the UL Fire Resistance Directory or the WHI Certified Listings Directory. These listings define the exact combination of door, frame, hardware, and glazing that may be used together to achieve a stated fire-resistance rating. The listing is not a general approval — it is a specific recipe that must be followed exactly.
Fire-rated assemblies are available in 20-minute, 45-minute, 60-minute, 90-minute, and 180-minute configurations. Each rating level has different requirements for component specifications, clearances, and labeling. Higher ratings generally require heavier gauge materials and more restrictive hardware selections.
Component Compatibility Rules
A fire-rated assembly is only valid when every component
Indicator locks, exit devices, closers, and lever sets.
This guide answers: When to Use Accentra Indicator Locks for Privacy Without Egress Violations
Why CDF Stocks Accentra
Accentra's product line — including locks, exit devices, and door closers — is available for configuration through CDF's ProBuilder tool as part of complete door, frame, and hardware assemblies.
Accentra is the successor brand to Yale Commercial, rebranded under the ASSA ABLOY family. Customers familiar with Yale Commercial locks, exit devices, and closers will find the same product line and engineering quality continued under the Accentra name. Accentra focuses on institutional-grade locksets, exit devices, and closers engineered for high-cycle applications in commercial and institutional facilities.
Accentra Indicator Locks: Privacy Without Egress Violations
Accentra indicator locks provide a visual occupancy indicator — typically a small window or flag on the exterior side of the lock — that shows whether a room
A specification guide to Adams Rite narrow stile locks, paddles, electric strikes, and cylinder options for aluminum storefront door assemblies — available through CDF Distributors via ASSA ABLOY distribution.
This guide answers: What Adams Rite hardware is required for commercial storefront door applications?
Why Storefront Doors Require Specialized Hardware
Commercial storefront doors differ fundamentally from standard hollow metal doors in their construction, profile dimensions, and hardware preparation requirements. Aluminum storefront doors use narrow stile profiles — typically 1-3/4 inches or 2 inches wide — that cannot accept standard cylindrical or mortise locksets designed for wider. Medium and wide style storefronts can be special ordered to accommodate a wider selection of hardware if needed. These potential dimensional constraint makes Adams Rite the dominant hardware specification for storefront applications, as the entire Adams Rite product line is engineered specifically
Astragals and mullions are vertical components installed between the two leaves of a commercial double door opening. An astragal is a metal or vinyl strip mounted to one door leaf that covers the gap where the two doors meet, sealing against light, sound, drafts, smoke, and fire. A mullion is a fixed or removable vertical member anchored to the frame head and floor, providing a structural mounting point for rim exit devices and locking hardware. Both components serve double door openings, but they function differently and are selected based on the hardware configuration, fire rating requirements, and whether full clear-width opening is needed.
CDF Distributors supplies astragals and mullions as part of complete commercial door assemblies fabricated at its Nashville, Tennessee facility. You can configure double door assemblies with the correct astragal or mullion using CDF’s ProBuilder tool at cdfdistributors.com. For assistance selecting the right component for your double door opening,
A specification guide to low-energy, full-power, and power-assist automatic door operators for commercial openings.
This guide answers: How Do Automatic Door Operators Work and When Are They Required for ADA Compliance?
Understanding Automatic Door Operators in Commercial Construction
Automatic door operators convert standard manual swinging, sliding, or folding doors into powered openings that can be activated by sensors, push plates, or remote signals. In commercial construction, these devices serve two primary functions: improving traffic flow in high-volume entrances and providing accessible entry for individuals with disabilities as required under the Americans with Disabilities Act (ADA) and the International Building Code (IBC).
The specification of automatic door operators requires careful coordination between the operator type, the door and frame assembly, the activation method, and any fire-rating or life-safety requirements imposed by the Authority Having Jurisdiction (AHJ).
A specification guide to commercial door pull types, ADA accessibility standards, materials, and mounting configurations.
This guide answers: How Do You Select Commercial Door Pulls That Meet ADA Requirements?
Commercial Door Pulls in Architectural Hardware Specification
Commercial door pulls are decorative and functional hardware components that provide a gripping surface for pulling a door open. Unlike lever handles or knob sets, pulls do not engage a latch mechanism — they are mounted to the door surface and used in conjunction with a separate latch or lock, or on doors that do not require latching (such as entrance doors held closed by a door closer).
Door pulls are specified in CSI Division 8 as part of the finish hardware schedule and are commonly used on entrance doors, vestibule doors, storefront systems, and interior doors where a pull-side grip is needed. The selection of door pulls involves aesthetic considerations (profile, finish, material), functional requirements (ADA compliance,
Selecting the right commercial lock depends on the door construction, the level of security required, and the function the lock must perform. The two primary commercial lock types are cylindrical lever locks and mortise locks. Cylindrical lever locks are the most commonly used lock type in commercial buildings and install through two bored holes in the door. Mortise locks fit into a pocket cut in the door edge and provide the highest strength and durability for high-traffic, high-abuse applications. This guide covers the differences between these lock types, the grading system that defines their durability, and the lock functions available for different commercial door applications.
CDF Distributors ships complete door, frame, and hardware assemblies from its Nashville, Tennessee headquarters. You can configure and order your lock as part of a complete assembly using CDF’s ProBuilder tool at cdfdistributors.com. For assistance selecting the right lock for your project, call (855) 769-9895
A specification guide to cylindrical and mortise lock construction, ANSI grades, lock functions, and selection criteria for commercial door assemblies.
This guide answers: What is the difference between cylindrical and mortise locksets for commercial doors?
Overview of Commercial Lockset Types
Commercial doors often require locksets engineered for high-cycle use, institutional security, and code compliance. The two dominant lockset families in commercial construction are cylindrical (also called bored) locksets and mortise locksets. Each uses a fundamentally different mounting method, internal mechanism, and chassis design. Selecting the correct type depends on traffic volume, security requirements, fire rating, and budget constraints.
CDF Distributors stocks both cylindrical and mortise locksets from Accentra (Formerly Yale), Corbin Russwin, Harger, Sargent , Schlage, and many other brand names. All of these manufacturers produce ANSI/BHMA-certified products across multiple grade levels,
A guide to CSI MasterFormat Division 8 specifications, hardware groups, door schedules, and the specification-to-order process for commercial openings.
This guide answers: How Are Commercial Doors and Hardware Specified in CSI Division 8?
Understanding CSI Division 8 in Commercial Construction
CSI MasterFormat Division 8 — Openings — is the specification division that covers doors, frames, hardware, glazing, and related components in commercial construction. Division 8 defines the materials, performance requirements, installation methods, and quality standards for every opening in a building, from the main entrance to interior office doors to fire-rated stairwell assemblies.
For contractors, facility managers, and building owners, understanding Division 8 is essential because it governs how doors and hardware are specified, procured, and installed. The specification document is the contractual basis for the hardware package — it defines what must be supplied, and any deviation from the
Selecting a commercial door closer requires matching three variables: the ANSI/BHMA closer size (1 through 6) to the door’s width and weight, the arm type to the frame and mounting condition, and the functional features (backcheck, delayed action, hold-open) to the building’s accessibility and fire-safety requirements. Getting any one of these wrong results in a closer that either cannot control the door or fails prematurely. This reference guide covers the selection criteria that commercial contractors, facility managers, and specifiers need to size and specify surface-mounted door closers for standard commercial openings.
CDF Distributors supplies commercial door closers as part of complete door and frame assemblies. You can configure and order assemblies online using CDF’s ProBuilder tool at cdfdistributors.com. For assistance selecting a closer for your project, call (855) 769-9895 or email sales@cdfdoors.com.
What Is a Commercial Door Closer?
A commercial door closer is a mechanical