An exit device — a panic bar — allows free egress from the inside. You push the bar, the latch retracts, and you walk out. That’s the life safety function, and it doesn’t change regardless of what’s on the outside of the door.
What changes is the trim: the hardware on the outside of the door that controls whether and how someone can enter. The trim is where access control lives on a door with an exit device. Understanding the trim options tells you what the door can and can’t do from the outside.
Outside Trim Options
Dummy Trim
Dummy trim is a handle on the outside that doesn’t function. It’s there for appearance or for pulling the door open from outside after it’s been unlocked by another means. The door can’t be opened from outside using the trim. This is used on doors that are exit-only — the door is always locked from outside, and entry is through a different door.
Keyed Trim (Night Latch)
Keyed trim — often called a night latch — is a cylinder and lever on the outside of the door. The lever doesn’t retract the latch unless a key is turned. When the key is turned, the lever engages and retracts the exit device latch, allowing the door to open. When the key is released, the lever disengages — the door is locked again.
This is called “night latch function” or “keyed trim with latch retraction.” It’s the standard trim for commercial exit doors that need key access from outside. A property manager with the correct key can enter through the door. Without the key, the door stays locked.
The night latch function is mechanical — no electronics, no power supply. The key operates the cylinder, which mechanically engages the trim lever to retract the latch. It’s simple, reliable, and compatible with master key systems.
Electric Trim
Electric trim replaces the keyed cylinder with an electrified lever. The lever is normally disengaged — pushing it does nothing. When the access control system sends an unlock signal, the lever engages and can retract the latch. After the door opens and closes, the lever disengages again.
Electric trim is what makes an exit device part of an access control system. The inside bar still allows free egress at all times — that never changes. The electric trim only controls the outside. When combined with a card reader, the door unlocks when a credential is presented, opens when the lever is turned, and re-locks when the door closes.
Electric trim can be fail-secure (stays locked when power is off) or fail-safe (unlocks when power is off). On an egress door, the inside bar always allows free exit regardless of the power state. The fail-secure/fail-safe setting only affects the outside trim.
Latch Retraction
Latch retraction trim uses an electric motor or solenoid to physically retract the exit device latch bolt — not just engage the lever. When activated, the latch pulls back and the door can be pushed open without turning any lever. This is used on high-traffic doors that need to be “open” during business hours and locked after hours.
Latch retraction is also used with fire alarm integration: when the fire alarm activates, the latches retract on all fire-rated exit doors, ensuring they can be opened from either side during an emergency.
What a Night Latch Actually Does
The term “night latch” gets used loosely, so it’s worth being specific. In exit device trim, a night latch is a keyed cylinder on the outside that mechanically retracts the latch when the key is turned. Here’s what it does and doesn’t do:
Does: Allows keyed entry from outside. The correct key, turned in the cylinder, engages the trim lever and retracts the exit device latch. The door opens. When the key is released, the latch re-engages — the door is locked from outside again.
Does not: Change the egress function. From the inside, the exit device bar always works. No key, no electronic signal, no special knowledge is needed to exit. The night latch only affects the outside.
Does not: Provide logging or access control. There’s no audit trail of who used the key. The night latch is mechanical. If you need to know who entered and when, you need electric trim with a card reader or keypad.
Does not: Allow remote unlocking. You can’t buzz someone in remotely with a night latch. You need electric trim or an electric strike for that.
Pairing Trim With Access Control
A door with a night latch today can be upgraded to electric trim later. The exit device body stays in place — only the outside trim is replaced. This is a common upgrade path for buildings that are moving from mechanical keys to card access.
The reverse is also possible. If a building’s access control system fails and electric trim stops working, the door can be opened with the mechanical key cylinder that’s built into the electric trim as a backup. The key cylinder overrides the electronics — it mechanically retracts the latch. This is why every electric trim installation should include a keyway that matches the building’s master key system.
Fire-Rated Considerations
On a fire-rated door, the trim has to be listed for fire door use. Not all electric trim is fire-rated — the trim has to be specifically listed and labeled for fire door applications. Latch retraction trim on a fire door has additional requirements: the latch has to extend fully when the door closes, and the trim can’t prevent the latch from engaging.
The Von Duprin 99 series — one of the most common exit devices in commercial buildings — offers keyed trim, electric trim, and latch retraction in listed versions for fire-rated doors. We install and service Von Duprin, Sargent, and Detex exit devices with all trim options throughout Broward and Miami-Dade.
What Pro Locksmith Does
Pro Locksmith LLC installs and services exit device trim — night latches, electric trim, and latch retraction — for commercial properties throughout Broward County and Miami-Dade, including Fort Lauderdale, Hollywood, Pembroke Pines, Davie, Pompano Beach, Coral Springs, and Miami. We pair trim with existing or new exit devices from Von Duprin, Sargent, and Detex, and we maintain mechanical key backup on every electric trim installation. Licensed and insured. Flat-rate pricing quoted up front. COI provided. Employees, not subcontractors.
If your exit doors need new trim, electric trim upgrade, or trim repair, call Pro Locksmith LLC at (954) 406-8266.
Sources
- ANSI/BHMA A156.3, Exit Devices
- NFPA 80, Standard for Fire Doors and Other Opening Protectives
- NFPA 101, Life Safety Code (egress requirements)
- ADA Standards for Accessible Design, Section 404