By Kent · Lock Depot Staff Writer

Von Duprin EL98TP: When Your Panic Bar Needs Electric Latch Retraction

The job usually starts with a card reader, not a hardware question. Somebody is adding access control to a door that already has a Von Duprin rim exit device on it, and the assumption is that the reader just gets wired to the existing bar. It doesn't work that way. A standard mechanical exit device, whether it is set up as Classroom function with a keyed lever or as an Exit Only fire door with no outside trim at all, has no path for a signal to open it. The Von Duprin EL98TP is the fix: a 98 Series rim device built with Electric Latch Retraction from the factory, so the same panic bar that lets people out also lets credentialed people in.

What Electric Latch Retraction actually does

EL retracts the latch bolt inside the exit device itself when it gets a signal, a card reader, a keypad, a buzzer button at the front desk. The door doesn't need someone to push the bar; the bar's own latch pulls back and the door swings open on a pull. That is a different job from an electric strike or a maglock, both of which work the frame side of the opening and leave the panic hardware doing exactly what it always did. EL changes the exit device itself. It is also a different job from a request-to-exit signal, which only reports that someone is leaving, it doesn't retract anything. The EL98TP-US32D-4 runs on 24VDC, wired straight into the access panel like any other electrified opening.

Why the mechanical trim on this family can't get you there

The two mechanical options in this same 99 Series line make the gap obvious. The 99L-US26D-3-RHR runs Classroom Function: the outside lever stays locked until a staff member turns a physical key, and it relocks itself the moment the door closes. There's no signal path in that mechanism at all, a card reader wired up to it has nothing to talk to. The 99EO-F-US26D-4 is further from the goal still: it's built Exit Only, meaning there is no outside trim on the door whatsoever. Nobody comes in that way, credentialed or not, key or no key. Neither device is broken or the wrong spec for what it was ordered to do. They're just mechanical devices being asked to do an electrified job.

Fire rating is where this gets specific, not general

Here's the part worth checking before anything gets ordered. The 99EO-F-US26D-4 we stock is Fire Rated, and it's mechanical. The EL98TP-US32D-4 we stock is Non Fire Rated, and it's the one with Electric Latch Retraction. That's not a coincidence you can plan around by assumption, it's a real split between the two specific part numbers in front of you. If the opening in question is fire-rated and the project also needs latch retraction, don't guess at a combination, call and we'll find out what Von Duprin actually offers for that exact door before you spec anything. Getting this wrong on a rated opening isn't a callback, it's a failed inspection.

Function, trim, and what ships in the box

The EL98TP-US32D-4 runs Night Latch function with TP (Thumbpiece) trim: someone on the outside presses the thumbpiece to retract the latch manually, and a key locks or unlocks that thumbpiece independent of the electric signal, so you keep a mechanical backup even after the access-control side is wired in. It's ANSI/BHMA Grade 1 architectural hardware with hex key dogging standard, same as the mechanical 99 Series bars, and it ships less cylinder, so order a rim cylinder separately to match the keyway already on the rest of the building. Finish is satin stainless steel, US32D/630, the same finish family as the 99L unit above.

Where this actually gets specified

I point people to EL when the door already has, or is getting, a Von Duprin rim device and the project wants card access added without ripping the exit hardware off and starting over with a maglock. A back door on a office suite that used to be keyed-staff-only and is getting badge readers for the whole floor. A stairwell re-entry door where facilities wants tenants to badge back in instead of holding it open with a wedge. A retail stockroom door where the owner wants delivery drivers to badge in during business hours and lock down hard after close. In all three, the panic hardware itself isn't changing, the exit path stays exactly as safe as it was. What changes is whether a valid card can pull the latch back from the outside.

Common questions

What does Electric Latch Retraction do differently from a maglock or electric strike?

A maglock or electric strike works the frame side of the door and leaves the exit device alone. Electric Latch Retraction changes the exit device itself, retracting its own latch bolt on a signal so the same panic bar handles both the exit side and the credentialed-entry side.

Can the 99L Classroom function bar be wired for card access instead of replacing it?

No. Classroom function only responds to a physical key at the outside lever, there's no electrical signal path built into that mechanism. Getting card access on that opening means moving to a device built with Electric Latch Retraction, like the EL98TP.

Is the EL98TP-US32D-4 available fire-rated?

Not the part number we stock. That SKU is Non Fire Rated. If the opening is fire-rated and also needs latch retraction, call us and we'll confirm what Von Duprin actually offers for that specific configuration before you order.

What's the difference between EL and QEL?

Both retract the latch electrically. QEL, Quiet Electric Latch, is built for high-cycle access-controlled doors where the standard EL solenoid noise becomes a nuisance over hundreds of cycles a day. EL is the standard version; QEL is the quiet upgrade for a busy door.

Does the thumbpiece still work if the access-control signal goes down?

Yes. The TP trim's mechanical thumbpiece and key override work independent of the electric signal, so a wiring fault or a powered-down panel doesn't lock staff out of manual entry.

Lock Depot stocks the Von Duprin EL98TP in satin stainless, in stock and ready to ship. Start at the Von Duprin hub for the full 98/99 lineup, or read Von Duprin 98/99: Exit Device for a Hollow-Metal Fire Door for the case and fire-rating decision behind these part numbers. If the project needs exit monitoring on top of retraction, see Von Duprin RX+QEL: Wiring Request-to-Exit Into a 99 Bar. Or call 877-365-5625 and describe the door. We'll tell you whether you need EL, QEL, or nothing more than a key.