Exit Device Outside Trim 2026: Every Trim Function Compared, Dogging Rules, and Why the Bar Is Never the Decision

An exit device is two products that ship as one. Inside is a bar that always releases the latch, and that half is not a decision — it is a life-safety requirement, and it behaves identically whichever device you buy.

Outside is the trim, and that half is the entire specification. It decides who can get in, whether the door can be left unlocked during trading hours, whether a key is needed, and what the opening does when the power fails.

A schedule that names an exit device and not its trim has specified the half that was never in question.

Every outside trim function, compared

The two that get confused are night latch and entrance. A night latch gives momentary access and relocks; an entrance trim can be left unlocked. On a shop that props its exit doors open all day, the first is wrong and generates a workaround; on a staff door that must never be left open, the second is wrong for the same reason in reverse.

The four device types, and which trims each one takes

Before the trim function there is the device type, and it constrains which trims are even available.

The row that catches projects out is the last one. A concealed vertical rod device needs a door built to take it — the rod channels are inside the leaf and cannot be added later. Specifying one on a door already on site is specifying a new door.

The vertical rod rows also carry a maintenance consequence worth knowing before selection rather than after. Rods latch at head and threshold, which means the bottom latch lives where the floor is, and floors collect grit, water and cleaning chemicals. A bottom rod that has stopped engaging is the commonest fault in this whole category, and on a pair it means the inactive leaf is being held by one latch instead of two.

Where that is a real risk — a wet entrance, a loading area, anywhere mopped daily — ask about a device with no bottom rod, or accept that the opening needs inspecting rather than assuming.

Pairs: the part that is not about the device at all

A pair of doors with exit devices raises two questions the device cannot answer by itself.

**Which leaf is active, and does the inactive leaf need to open?** If it does, it needs its own device or flush bolts, and if it does not, flush bolts alone may be enough — but flush bolts on an escape route are constrained, because a leaf that needs a second action to open is a leaf that people cannot use in a crowd.

**Do the leaves need to close in order?** They do if they overlap, and that is a door coordinator rather than a device — a separate product, on a separate line, that nobody remembers until a pair of fire doors is found sitting open at the meeting stile.

Both of these are why a pair costs more than twice a single door in hardware terms, and why the schedule line for a pair should be written as a set rather than as two copies of a single-door line.

Dogging: what it is, and the one rule that is absolute

Dogging holds the latch retracted so the door pushes open freely from both sides. A shop with a dogged exit door during trading hours has a door that works like a push-plate and locks properly at night with one action.

There are two mechanisms. **Mechanical dogging** uses a hex key or similar tool on the device itself. **Cylinder dogging** uses a keyed cylinder in the device, so the same key management as the rest of the building controls it.

Cylinder dogging costs more and is usually the right answer in any building where more than one person opens up, because a hex key that lives on a hook is a hex key that anybody can use, including after hours.

**The absolute rule: a fire exit device must not be dogged.** A fire door works by staying latched, and dogging holds the latch retracted — the two are directly contradictory. Devices intended for fire doors are built without a dogging facility for exactly this reason, and a device with dogging fitted to a fire door is a non-compliant opening whatever else is correct about it.

If a fire-rated door needs to be free-swinging during occupied hours, the answer is an electromagnetic hold-open released by the alarm system, not a dogged latch. Our fire door hardware page covers why.

The two questions the trim has to answer before anything else

**Does the door need to be securable from outside without a key?** If the answer is no — and it usually is — then any trim with a thumbturn or a free lever is wrong, however convenient.

**What happens when the power fails?** Only relevant for electrified trim, and it is the question that gets deferred to commissioning. Fail-safe releases on power loss; fail-secure stays locked. Which is correct is a decision for that specific opening and two doors in one corridor can legitimately differ.

Free egress is not affected by any of this

Worth stating explicitly because it is the source of most anxiety about exit device specification.

No outside trim function — not storeroom, not electrified, not a blank plate — changes what happens when somebody pushes the bar from inside. The bar retracts the latch and the door opens. That is the point of the device and it is not configurable.

So the trim decision is a security and convenience decision, not a safety one, provided the device itself is the right device for the opening. The safety decisions were made earlier: whether the opening needs an exit device at all, and which standard it has to meet.

Trim and device are ordered together, and often are not

The single most common ordering error in this category: a device ordered without its trim, or a trim ordered for a device from another range.

They are matched products. The trim's spindle or tailpiece has to engage the device's mechanism, the fixing centres have to align, and on many ranges the trim is handed. A trim that looks identical from a catalogue photograph may not engage at all.

So order them as a pair, by model, and state the function on the trim line rather than assuming it from the device. Our order code page covers how the function suffix is written — `ET` entrance, `PS` passage — and a trim ordered without one arrives as whatever the default is.

What we publish on our own trims

Our catalogue carries 46 products named as panic or exit hardware: 30 devices, 15 outside trims and 1 lock case.

Of those 15 trims, **three publish a function row** — one entrance, one passage, one described as a safety lock with cylinder. The other twelve publish dimensions and finishes but leave the function to the enquiry.

That is the honest state, and on this category it matters more than on most, because as this page has argued the function is the entire point of the trim. We are publishing the half that was never in question and leaving the half that was.

It is being fixed by measurement and confirmation rather than by inference — a trim's function is a property of its mechanism, and writing a plausible one into a specification table would be the same error as writing a plausible dimension. In the meantime, ask, and the answer comes back per model.

The four lines an exit device order needs

The device model, and whether it is rim, mortise, surface vertical rod or concealed vertical rod.

The trim model **and its function**, named.

Dogging: none, mechanical, or cylinder — and if the door is fire-rated, none, with the fire rating stated so the device selected is one without the facility.

The door width and handing, because push bar length follows the door and the trim is frequently handed.

Our 307 and 311 exit devices are in testing. Until certificate numbers exist, nothing we publish will imply they hold a fire rating, an ANSI grade or a UL listing — which is also why this page talks about the fire dogging rule in general terms rather than pointing at a product.