The Problem That Shows Up at Final Inspection
A magnetic lock kit gets ordered, mounted, and wired. The door holds. The keypad works. Then the inspector arrives and the project stalls because nobody confirmed how an occupant inside the building is supposed to get out without a credential. That single decision — what releases the lock from the egress side — is the one most often deferred until it is too late to change the configuration without rework.
This guide is for contractors, facility managers, and architects who are specifying or installing electromagnetic lock kits on exterior doors and need to understand the egress release options, the code logic behind them, and the sequencing mistake that creates callbacks.
What Is an Electromagnetic Lock Kit?
An electromagnetic lock kit (commonly called a maglock kit) is an access-control assembly that typically includes a direct-hold electromagnetic lock body, an armature plate mounted to the door face, a power supply, and some form of ingress credential device such as a weatherproof keypad or card reader. The lock holds the door closed when energized; cutting power releases it. Holding forces in commercial kits commonly range from roughly 600 lb to 1,200 lb or more, depending on the application.
Because the maglock provides no mechanical latch, the entire security and release function is electrical. That is both the advantage and the compliance challenge.
Fail-Safe by Design — and Why That Creates an Egress Obligation
Electromagnetic locks are fail-safe devices: loss of power releases the door. That characteristic satisfies one half of the code requirement — the door will open during a fire alarm or power outage. But codes such as IBC Section 1010.1.9.7 and NFPA 101 Section 7.2.1.6.2 impose additional requirements for occupied buildings:
- The door must be releasable from the egress side without a key, special knowledge, or credential.
- Release must happen immediately upon operation of a listed hardware device or sensor.
- The fire alarm system must also interrupt power to the lock.
None of those three requirements care about how the ingress keypad works. They only care about what happens on the inside of the door when someone needs to leave.
The Four Egress Release Options — and When Each Is Appropriate
1. Sensor (Motion Detector / PIR)
A passive infrared sensor mounted above the door detects an approaching occupant and interrupts lock power before the person reaches the door. This is the most seamless experience for occupants and is widely used in schools, healthcare corridors, and retail back-of-house exits. The sensor must be listed for the application and positioned to detect egress motion reliably without nuisance trips from adjacent activity.
2. Push-to-Exit Button
A listed momentary push button, typically mounted 40 to 48 inches above the floor within 5 feet of the door, interrupts lock power for a timed period (commonly 30 seconds) to allow egress. IBC and NFPA 101 permit this method and require the button to be clearly labeled. It is the most common retrofit solution and the easiest to add when a kit does not include a built-in sensor.
3. Listed Hardware with Built-In Switch
Beginning with the 2007 IBC Supplement and expanded in the 2012 IBC, a listed lever handle, pull, or panic bar with a built-in switch that directly interrupts lock power satisfies egress requirements without a separate release device. The switch must directly cut power — it cannot send a signal through an access control panel that then releases the lock. This is the cleanest solution architecturally and the one most likely to satisfy a strict AHJ, but it requires confirming the hardware is specifically listed for this function.
4. Delayed Egress Configuration
In limited occupancies and with AHJ approval, a 15-second delayed egress lock may be permitted. This is a distinct product category and requires the building to have full sprinkler coverage or smoke and heat detection. Do not assume a standard maglock kit can be programmed for delayed egress — that function requires a specifically listed delayed egress device.
The Sequencing Problem: Why the Release Method Gets Chosen Last
Here is what typically happens on a commercial project: the access control scope gets defined (keypad, maglock, power supply), the kit gets ordered as a unit, and the installer mounts everything before anyone has asked the AHJ which egress release method is acceptable for that occupancy and door location.
The result is one of two callbacks:
- A push-to-exit button gets added in the field — sometimes in a location that does not meet the 5-foot proximity requirement or is mounted at the wrong height for ADA compliance.
- A PIR sensor gets added after drywall is finished — requiring a surface-mount conduit run that the GC did not budget and the owner did not expect to see.
The fix is straightforward: confirm the egress release method with the AHJ before the kit ships. Most kits can be ordered with or without a push-to-exit button, and some include sensor provisions or wiring terminals for field-added devices. Knowing the requirement in advance means the hardware arrives complete.
Weatherproofing the Keypad Side — A Separate but Parallel Decision
On exterior applications, the ingress credential device — typically a keypad — must be rated for outdoor exposure. A keypad rated for interior use will fail from moisture infiltration within a single winter in most climates. Weatherproof or outdoor-rated keypads are a standard option on commercial maglock kits and should be specified explicitly rather than assumed.
Similarly, the power supply should be located indoors in a conditioned or at minimum weather-protected enclosure. Routing low-voltage wiring through an exterior wall requires attention to conduit sealing to prevent moisture migration that can damage the power supply or cause nuisance faults on the lock circuit.
Fire Alarm Interface: Non-Negotiable on Every Occupancy
Both IBC and NFPA 101 require that electromagnetic locks on egress doors release upon activation of the building fire alarm system. This interface is not optional and is not the access control contractor's call alone — it must be coordinated with the fire alarm contractor. The power supply for the maglock must be wired so that a fire alarm signal drops power to the lock. Some power supplies include a dedicated fire alarm input terminal for this purpose; others require a relay in the fire alarm panel. Confirm the interface method before rough-in.
Application Contexts Where This Comes Up Most Often
- Schools: Exterior vestibule and perimeter doors secured during school hours. AHJ interpretation of egress release requirements varies by state; some require motion sensors, others accept push-to-exit.
- Healthcare: Controlled access to clinical areas, pharmacies, and server rooms. Fire alarm interface is closely scrutinized during CMS and state health department inspections.
- Retail and light commercial: Back-of-house and receiving doors where keypad control replaces keyed locksets. Push-to-exit buttons are the most common solution in these low-occupancy settings.
- Industrial and warehouse: Loading dock personnel doors and secured equipment rooms. Weatherproofing requirements are highest here; confirm IP or NEMA ratings on all exterior components.
What to Confirm Before You Order
Before placing a maglock kit order for an exterior or access-controlled egress door, work through this short checklist:
- Which egress release method has the AHJ accepted — sensor, push-to-exit, or listed hardware switch?
- Is the keypad or credential reader rated for outdoor exposure?
- Where will the power supply be located, and is that location conditioned and accessible?
- How will the fire alarm system interface with the lock power supply?
- Does the door serve an occupancy requiring panic hardware? (If yes, the release method requirements change.)
- Is the holding force appropriate for the door size, weight, and anticipated wind load?
DoorwaysPlus carries magnetic lock kits, push-to-exit devices, weatherproof keypads, and the associated power supplies to build out a compliant access-controlled opening. If you need help confirming compatibility or specifying the right configuration for your project, contact the team before the job is scheduled for inspection.