What an Exit Device Does
An exit device — commonly called a panic bar or crash bar — is a door-mounted mechanism that allows fast egress by pushing on a horizontal bar. You do not need to turn a knob or pull a handle. You push, the latch retracts, and the door opens. This is why they are required on doors serving high-occupancy spaces: when people need to leave quickly, fine motor skills disappear. A push bar works when a knob will not.
NFPA 101, the Life Safety Code, requires panic hardware on doors serving assembly and educational occupancies once the occupant load reaches 100 — theaters, auditoriums, restaurants, bars, clubs and schools among them. Day-care occupancies are covered under their own provisions. What triggers the requirement is the calculated occupant load of the space, not the type of business on the sign, and the fire marshal is the one who applies it. The code is not optional, and local fire marshals enforce it during inspection.
Types of Exit Devices
There are three primary types, each suited to different door configurations:
Rim exit devices. The latch sits on the surface of the door face and engages a strike mounted on the frame. Simplest to install and service. Common on single doors and narrow-stile aluminum storefront doors.
Mortise exit devices. The latch is built into a mortise lock body recessed into the door. More durable than rim, handles higher traffic. Used on heavy wood or hollow metal doors in commercial settings.
Vertical rod exit devices. Two rods extend from the device to the top and bottom of the door, latching at both the header and the floor. Used on pairs of doors where there is no center mullion. Surface-mounted rods are visible; concealed rods are hidden inside the door.
Vertical rod devices are the most complex to adjust and the most common source of exit device failures. If the door sags or the frame shifts, the rods misalign and the latch will not engage. This is a code violation, not just a maintenance issue.
Fire-Rated vs. Panic-Rated
Not all exit devices are fire-rated. A panic-rated exit device is designed for egress. A fire-rated exit device is designed for egress and for fire resistance. The difference matters because fire doors have specific requirements.
A fire-rated exit device must be listed by a recognized testing laboratory — typically UL — and must be positively loaded. That means the latch cannot be held retracted. When you release the bar, the latch snaps back into the locked position. This is called “dogging” and on fire-rated devices, it is not allowed. The door must latch every time it closes.
Non-fire-rated exit devices can be dogged — held in the open position with the latch retracted — using a hex key or a dogging key. This is common on retail doors during business hours. But if the door is part of a fire-rated assembly, dogging voids the fire rating.
Manufacturers and Hardware
The exit device market is dominated by a few manufacturers whose products are interchangeable in function but not in parts:
- Von Duprin: The industry standard. The 98/99 series rim device is the most widely installed commercial exit device in North America. Parts are widely available.
- LCN: Manufactured by the same parent company as Von Duprin. LCN is known for door closers, and their exit devices integrate well with LCN closer assemblies.
- Sargent: The Sargent 80 series is a direct competitor to Von Duprin. Common in institutional and commercial buildings.
- Detex: Specializes in delayed egress and alarmed exit devices. Used where code allows delayed egress — typically healthcare and detention facilities.
Choosing a manufacturer is less important than choosing the right type for the door. A rim device on a pair of doors without a mullion will not work. A surface vertical rod on a high-traffic door will need constant adjustment. Match the device to the opening.
ADA and Opening Force
ADA Standards, Section 404, requires that interior doors require no more than 5 pounds of force to open. Exterior doors are not held to the same standard, but local jurisdictions in South Florida often apply the 5-pound rule to accessible entries.
Exit devices themselves require very little force to actuate — typically 3 to 5 pounds of push pressure on the bar. The problem is almost never the device. It is the door closer. A closer adjusted too hard adds 8 to 15 pounds of resistance. The combined force of the closer and the exit device can exceed what ADA allows, even though the device itself is compliant.
If a door fails an ADA inspection, the first thing to check is the closer, not the exit device. Reduce the closer’s spring tension, check the backcheck, and verify the door swings freely without the closer attached. If it does, the closer is the problem.
Common Failures in South Florida Buildings
South Florida’s climate accelerates exit device wear in specific ways:
Salt air corrosion. Coastal buildings in Fort Lauderdale, Pompano Beach, and Hollywood see rust on push bars, rod mechanisms, and strike plates. Stainless steel and aluminum components resist this better than plated steel.
Humidity and latch binding. High humidity causes lubricant to wash out of latch mechanisms faster. A dry latch sticks, which means the door does not latch when it closes. This is a fire code violation on rated assemblies.
Door sag on aluminum storefront frames. Narrow-stile aluminum doors are common in South Florida retail. They are lightweight and flexible. Over time, the door sags on its hinges, and the exit device latch no longer aligns with the strike. The fix is usually a hinge adjustment, not a device replacement.
Hurricane impact doors. After hurricane upgrades, many buildings have heavier doors with impact glass. The original exit device may not have enough throw to reach the strike on the thicker door. This requires a device with extended latch throw.
Maintenance Schedule
Exit devices are life safety equipment. They should be tested monthly and serviced annually. A maintenance check includes:
- Push the bar and confirm the latch retracts fully and springs back when released.
- Close the door and confirm the latch engages the strike without force.
- Check that the door latches on its own from a 30-degree open position.
- Inspect all mounting screws — loose screws cause misalignment.
- Lubricate the latch mechanism with a dry graphite or PTFE lubricant. Avoid oil-based lubricants, which attract dirt and gum up over time.
- On vertical rod devices, check top and bottom rod engagement separately.
Pro Locksmith Fort Lauderdale is a licensed and insured commercial locksmith serving Broward and Miami-Dade counties. Work is performed by employees, not subcontractors. A certificate of insurance is provided for commercial properties. Call (954) 406-8266.