This guide reflects CDF Distributors' standard specifications and field-tested recommendations used by commercial contractors nationwide. The information is provided for specification and selection purposes. Always verify requirements with the Authority Having Jurisdiction (AHJ) for your project location.

For questions or to order a complete door assembly, contact CDF at (855) 769-9895 or sales@cdfdoors.com. Configure your assembly online at ProBuilder: cdfdistributors.com.

About This Guide

What ANSI grade is required for institutional locksets?

ANSI Grade 1 is the minimum specification for institutional applications. Grade 1 cylindrical locks must withstand 800,000 cycles and Grade 1 mortise locks must withstand 1,000,000 cycles. Institutional environments require these higher performance levels due to heavy traffic and aggressive use patterns.

What is classroom security function F109?

F109 allows a teacher to lock the outside lever from inside the classroom using a thumbturn or button, without opening the door. The inside lever always allows free egress. The outside key cylinder provides override for administrators and first responders. F109 is the standard lockdown function for school classroom doors.

What lock function is used for hospital patient room doors?

ANSI/BHMA Function F97 (corridor function) is the standard for hospital patient rooms. It provides an interior privacy lock for patient dignity with emergency key override from the corridor side. The inside lever always allows free egress.

What is ligature-resistant hardware?

Ligature-resistant hardware is designed to prevent attachment of cords, sheets, or clothing. Features include sloped or breakaway levers that shed material under downward force, smooth rounded escutcheons with no gaps or edges, and through-bolt mounting with no exposed fasteners. Required in behavioral health facilities by risk assessment and regulatory standards.

What fire ratings apply to institutional door openings?

Institutional fire-rated openings carry ratings of 20, 45, 60, 90, and 180 minutes depending on the fire barrier classification. All hardware on fire-rated openings must be listed for the specific rating. Lock functions must ensure positive latching during a fire event.

What makes correctional-grade hardware different from standard Grade 1?

Correctional-grade hardware adds tamper resistance, attack resistance, and hardened materials beyond Grade 1 requirements. Features include hardened steel components, security-type fasteners, anti-drill and anti-saw construction, and clutch levers that spin freely under excessive force to prevent use as improvised tools.

Can CDF supply institutional locksets for school lockdown requirements?

CDF distributes classroom security (F109) locksets from Yale, Corbin Russwin, and Sargent through ASSA ABLOY's FlashShip and Banner Solutions channels. ProBuilder supports F109 function selection as part of complete door assembly configuration. CDF provides project-level specification support for school district projects.

What is institution function F110 and where is it used?

F110 locks both inside and outside levers by key, requiring authorized key access for any passage. It is used in correctional facilities, behavioral health units, and secure government areas where occupant movement must be actively controlled and unrestricted egress is not required.

Frequently Asked Questions

CDF's ProBuilder tool allows contractors and facility managers to configure complete door, frame, and hardware assemblies online. During configuration, you can select the specific components discussed in this guide and receive an instant quote.

For assistance or to order a complete door assembly, call (855) 769-9895 or email sales@cdfdoors.com. CDF's sales team is available to help you specify the right components for your project.

Configure Your Door Assembly

CDF Distributors provides institutional-grade locksets from Yale, Corbin Russwin, and Sargent — three ASSA ABLOY brands that collectively cover the full range of institutional lock functions, grades, and specialty configurations.

CDF's ProBuilder tool supports institutional hardware specification. When configuring a door assembly for a school, hospital, or correctional facility, the user selects the appropriate lock function (F109, F97, F110, etc.), the grade and construction type (cylindrical or mortise), and any specialty features (ligature-resistant trim, vandal-resistant construction, security-type fasteners). ProBuilder validates the selection against the door and frame configuration and fire rating requirements.

For large institutional projects — school districts, hospital campuses, correctional facilities — CDF provides project-level specification support. This includes reviewing the complete door hardware schedule, verifying lock function assignments for each opening, confirming fire-rating compatibility, and coordinating keying across the facility. This level of support is particularly valuable for projects where the hardware schedule includes multiple specialized lock functions across hundreds of openings.

How CDF Distributors Supplies Institutional Locksets

The following summary describes the ANSI/BHMA lock functions most commonly specified in institutional facilities. These function numbers are used in door hardware schedules and should be specified precisely to ensure the correct operating behavior at each opening.

• F84 — Classroom: Outside lever locked/unlocked by key only. Inside lever always free for egress. Standard for classroom doors where lockdown is performed from the corridor side.

• F97 — Corridor: Patient privacy lock on inside. Emergency override by key or tool from corridor side. Inside lever always free for egress. Standard for hospital patient rooms.

• F109 — Classroom Security: Outside lever locked/unlocked by interior thumbturn AND exterior key. Inside lever always free for egress. Allows teacher to lock down from inside without opening the door.

• F110 — Institution: Both inside and outside levers locked and unlocked by key. Used in supervised occupancies where unrestricted egress is not required (correctional, behavioral health).

• F86 — Storeroom: Outside lever always locked, operable only by key. Inside lever always free for egress. Used for utility rooms, storage, mechanical rooms.

• F82 — Entry/Office: Key locks or unlocks outside lever. Inside lever always free. Used for offices and administrative areas.

Key Lock Functions for Institutional Specification Reference

Institutional facilities contain a high concentration of fire-rated openings due to the number of occupied rooms, corridors, stairwells, and high-hazard areas that require fire separation. Fire-rated openings in commercial construction carry ratings of 20 minutes, 45 minutes, 60 minutes, 90 minutes, and 180 minutes, depending on the fire barrier classification.

The following summary provides fire rating context for institutional applications: 20-minute rated openings are common for corridor doors in educational and healthcare occupancies. 45-minute rated openings are used in 1-hour corridor walls. 60-minute rated openings are found in 1-hour fire barrier walls separating different occupancy types. 90-minute rated openings protect 2-hour fire barrier walls including stairwell enclosures and horizontal exits. 180-minute rated openings protect 3-hour or greater fire barriers in high-hazard separations and critical egress paths.

All hardware installed on fire-rated openings must be listed and labeled for the specific fire rating. Locksets, closers, hinges, exit devices, and accessories must all carry compatible fire listings. The lock function must ensure positive latching — the latchbolt must fully engage the strike when the door closes during a fire event. Lock functions that allow the latch to be retracted and held (such as passage or storeroom functions with hold-back features) are generally not permitted on fire-rated openings.

In institutional facilities, the combination of fire rating requirements and specialized lock functions (F109 classroom security, F97 corridor, F110 institution) creates a specification challenge. Not all lock functions are available with all fire ratings from all manufacturers. CDF's sales engineering team assists with verifying fire-rating compatibility for institutional lock function specifications.

• 20-minute rated openings: corridor doors in educational and healthcare occupancies

• 45-minute rated openings: 1-hour corridor wall doors

• 60-minute rated openings: 1-hour fire barrier wall doors

• 90-minute rated openings: 2-hour fire barrier walls, stairwell enclosures, horizontal exits

• 180-minute rated openings: 3-hour or greater fire barriers, high-hazard separations

Fire-Rated Openings in Institutional Facilities

Schools, public libraries, recreation centers, and government buildings experience deliberate hardware abuse that falls short of correctional-level attack but exceeds normal commercial wear. Vandal-resistant hardware specifications address this middle ground with features such as through-bolt lever mounting (resists lever pull-off), clutch levers (spin freely under excessive torque to prevent damage), heavy-gauge escutcheons (resist prying), and tamper-resistant screws.

For schools specifically, the combination of classroom security function (F109) and vandal-resistant construction addresses both the security threat (intruder lockdown) and the daily abuse (student traffic, deliberate hardware manipulation). CDF distributes Grade 1 classroom security locksets from Yale, Corbin Russwin, and Sargent that include vandal-resistant features as standard in their institutional product lines.

Vandal-Resistant Hardware for Schools and Public Buildings

Correctional facilities require hardware that resists deliberate, sustained attack by determined individuals using improvised tools. Standard commercial hardware — even ANSI Grade 1 — is not designed to withstand this level of abuse. Correctional-grade hardware specifications add tamper resistance, attack resistance, and materials requirements that exceed standard commercial testing.

Correctional-grade locksets use hardened steel components throughout — latchbolts, strike plates, mounting screws, and lever cores. Exposed fasteners are eliminated or use security-type (tamper-resistant) heads that cannot be removed with standard tools. Lock bodies are constructed of heavy-gauge steel or stainless steel with anti-drill and anti-saw features.

Lever trim for correctional applications is typically a fixed pull (no rotating lever) to prevent the operating mechanism from being used as a weapon or improvised tool. Where rotating levers are required, they use a clutch mechanism that allows the lever to spin freely if forced beyond the normal operating range, preventing damage to the lock mechanism and eliminating the lever as a prying tool.

Sargent, Yale, and Corbin Russwin — all ASSA ABLOY brands — manufacture correctional-grade hardware that is distributed through CDF via Banner Solutions. Correctional hardware specification requires close coordination with the facility's security consultant and the lock manufacturer's correctional hardware specialist.

Correctional-Grade Hardware Specifications

Behavioral health facilities — psychiatric units, crisis stabilization units, and inpatient substance abuse treatment centers — require hardware specifically designed to resist use as a ligature attachment point. A ligature-resistant (sometimes called anti-ligature) lockset has a lever shape, escutcheon design, and mounting configuration that prevent a cord, sheet, or clothing item from being secured to the hardware.

Standard commercial levers — whether straight, curved, or L-shaped — can serve as attachment points. Ligature-resistant levers use a downward-sloping return design that sheds any material placed over them. When downward force is applied to a ligature-resistant lever (as would occur if a ligature were attached), the lever deflects downward and the material slides off. Some designs use a breakaway mechanism where the lever detaches from the lock body under a specified load.

Ligature-resistant escutcheons (rose plates) are smooth and rounded with no edges, gaps, or protrusions that could anchor a ligature. Through-bolt mounting eliminates exposed screws that could be removed to create a gap behind the escutcheon. The entire hardware assembly — lever, escutcheon, and mounting — must be evaluated as a system for ligature resistance.

ASSA ABLOY brands including Corbin Russwin, Yale, and Sargent manufacture ligature-resistant locksets specifically designed for behavioral health applications. These products are available through CDF via FlashShip and Banner Solutions distribution. CDF's sales engineering team provides specification assistance for behavioral health projects where ligature-resistant hardware is required by the facility's risk assessment.

• Lever design: sloped, rotating, or breakaway to prevent ligature attachment

• Escutcheon: smooth, rounded, no gaps or edges, through-bolt mounted

• Complete system evaluation: lever, escutcheon, and mounting must all resist ligature use

• Compliance: verify with facility risk assessment and applicable Joint Commission or state requirements

Ligature-Resistant Hardware for Behavioral Health Facilities

The corridor function, designated ANSI/BHMA Function F97, is the standard specification for hospital patient room doors. This function allows the patient to lock the door from inside for privacy, while providing emergency override capability from the corridor side. A key or special tool operated from the corridor side can retract the privacy lock at any time, allowing staff to enter in an emergency.

F97 provides a balance between patient dignity (the ability to lock the door for privacy during treatment, personal care, or rest) and clinical safety (the ability for staff to enter immediately when a patient requires emergency assistance). The inside privacy button or thumbturn is designed for easy operation by patients with limited dexterity, and the emergency override from the corridor side requires a key or coin-turn to prevent unauthorized entry by other patients or visitors.

In behavioral health applications, the standard F97 corridor function may not be appropriate because the interior privacy mechanism could be used to barricade. Behavioral health patient room doors typically use modified functions that eliminate the interior privacy lock entirely, placing all access control in the hands of staff.

Corridor Function (F97) — Hospital and Healthcare Applications

The institution function, designated ANSI/BHMA Function F110, provides key-operated control of both the inside and outside levers. Both levers are locked by key and can only be operated by authorized personnel with the correct key. This function is used in openings where unrestricted egress is not required — specifically in areas where patients, residents, or inmates are under supervised control.

F110 is used in correctional facilities (cell doors, secure housing units), behavioral health units (patient rooms where elopement is a risk), and secure areas of government buildings. Because F110 locks both sides by key, it does not comply with standard egress requirements and can only be used where the AHJ has approved supervised egress procedures.

The distinction between F110 and standard storeroom function (F86) is important. F86 has a fixed outside lever that is always locked and a free inside lever that always allows egress. F110 adds the ability to lock the inside lever as well, creating a fully controlled opening where no one can pass without a key. This level of control is necessary in institutional settings where occupant movement must be actively managed.

Institution Function (F110) — Staff-Controlled Access

The classroom security function, designated ANSI/BHMA Function F109, has become one of the most critical lock function specifications in the education sector. This function allows a teacher or authorized staff member to lock the outside lever from inside the classroom without opening the door, providing immediate lockdown capability during a security threat.

In standard classroom function (F84), the outside lever is locked and unlocked only by key from the outside. This means that during a lockdown event, a teacher must open the door, reach outside to insert a key, turn the key to lock the outside lever, and then re-enter the classroom. This sequence exposes the teacher to the threat and wastes critical seconds during an emergency.

The F109 classroom security function solves this problem by adding an interior thumbturn or push-button that locks the outside lever without requiring the door to be opened. The inside lever always allows free egress (code-required), and the key cylinder on the outside provides override capability for administrators and first responders. Some F109 implementations include a visual indicator on the corridor side that shows whether the lock is in the locked or unlocked position.

CDF distributes classroom security locksets from Yale, Corbin Russwin, and Sargent — all ASSA ABLOY brands that manufacture F109-function locksets in both cylindrical and mortise configurations. These products are available through FlashShip and Banner Solutions fulfillment channels.

• Interior thumbturn or button locks the outside lever without opening the door

• Inside lever always allows free egress — code-compliant at all times

• Outside key cylinder provides administrative and first-responder override

• Visual indicator (available on some models) shows locked/unlocked status from the corridor

Classroom Security Function (F109) — Intruder Lockdown

ANSI/BHMA A156.2 (for bored locks) and A156.13 (for mortise locks) define three performance grades for commercial locksets. Grade 1 is the highest performance tier and is the minimum specification for institutional applications.

Grade 1 cylindrical (bored) locks must withstand a minimum of 800,000 cycles in operational life testing. Grade 1 mortise locks must withstand 1,000,000 cycles. These cycle counts simulate years of heavy institutional use — a school classroom door that is opened and closed hundreds of times per day, or a hospital patient room door that sees continuous traffic from staff, patients, and visitors.

In addition to cycle count, Grade 1 testing includes torque resistance (the lock must withstand a specified torque applied to the lever without damage), impact resistance (the lock must survive a specified impact force applied to the lock face), and security tests (the lock must resist specified forced-entry techniques). Grade 1 locks use heavier gauge materials, hardened steel components, and reinforced mounting systems to achieve these performance levels.

For institutional applications, specifiers should look beyond the Grade 1 minimum and consider the specific construction features of the lock: solid cast levers (versus hollow or stamped levers), through-bolted mounting (versus clip-on trim), and hardened steel latchbolts (versus standard brass or zinc latchbolts). These features extend the functional life of the hardware in demanding institutional environments.

ANSI Grade 1 Heavy-Duty Performance Requirements

Institutional facilities — schools, hospitals, behavioral health units, government buildings, and correctional facilities — subject door hardware to conditions that exceed the design parameters of standard commercial locksets. The combination of high traffic volume, aggressive use patterns, security threats, life safety requirements, and regulatory mandates creates a demanding environment that requires purpose-engineered hardware solutions.

Standard commercial-grade hardware (ANSI Grade 2 or Grade 3) is not sufficient for institutional applications. These grades allow for lower cycle counts, reduced torque resistance, and materials that degrade under heavy use. Institutional specifications require ANSI Grade 1 heavy-duty hardware as the minimum baseline, with additional performance requirements layered on top for specific facility types.

The lock function — the specific operating behavior of the lock — is equally important in institutional applications. Standard office and privacy functions do not address the unique operational requirements of classroom lockdown, patient room privacy with emergency override, or correctional cell control. Institutional lock functions are defined by ANSI/BHMA function numbers and must be specified precisely to match the operational requirements of each opening.

Why Institutional Facilities Require Specialized Locksets

A specification guide to institutional-grade locksets covering ANSI Grade 1 requirements, classroom security functions, ligature-resistant hardware, hospital privacy, correctional-grade specifications, and fire-rated institutional openings — available through CDF Distributors via ASSA ABLOY/FlashShip/Banner Solutions distribution.

This guide answers: What lockset requirements apply to institutional facilities including schools, hospitals, and corrections?