Pairs of doors are where facility managers lose the most time for the smallest reasons. One leaf latches, the other does not. The doors close in the wrong order and bounce apart. A fire inspector pushes on the inactive leaf and writes it up. Nothing looks broken, and yet the opening does not work.
Almost always the cause is one of three pieces of hardware that nobody thinks about: the coordinator, the astragal, or the closers’ relative timing. Here is how to tell which one you are dealing with.
Why a pair of doors needs a coordinator at all
On a pair with an overlapping astragal, the two leaves cannot close in any order they like. The inactive leaf has to close first, because the astragal — the vertical strip that covers the gap between them — sits in the path of the active leaf. If the active leaf gets there first, the inactive leaf cannot come home, and the pair stays open or sits closed but unlatched.
A coordinator is the device that enforces the order. It mounts in the frame head and holds the active leaf back until the inactive leaf has closed, then releases it. When it works, nobody knows it is there.
What a failed coordinator looks like
- Both doors release at once and clash in the middle.
- The inactive leaf stops a few centimetres short and stays there.
- The active leaf closes and latches, but the inactive leaf is loose when you pull on it.
- A noticeable bang from the pair every time it closes.
Coordinators fail for mundane reasons. The trigger arm bends. Someone paints over the mechanism. The soffit bracket loosens. A new closer gets installed with far more power than the old one and overwhelms the coordinator’s hold. All of them are repairable, and all of them get misdiagnosed as a latch problem.
The astragal: the part that gets removed and never replaced
On a fire-rated pair, the astragal is not trim. It closes the gap between the leaves, and on a rated assembly it is part of what the rating depends on. It also carries the strike for the active leaf on many pairs.
Astragals get damaged by carts, bent by forced entry, and sometimes taken off entirely because someone found them annoying. Once it is gone, the active leaf has nothing to latch into and nothing stopping smoke from passing between the leaves. A pair missing its astragal is one of the more common things flagged on fire exit door inspections, and it is also one of the easiest to miss on a walkthrough because the doors still swing normally.
Overlapping versus meeting astragals
An overlapping astragal means you need a coordinator. A flush or meeting astragal, where the two edges meet without overlap, generally does not. If someone has changed the astragal type at some point without changing the rest of the hardware, you can end up with a coordinator fighting doors that no longer need one, or a pair that needs sequencing and has none.
Closers: power, speed and the order they create
Even with a working coordinator, two closers set to different speeds will produce odd behaviour. If the inactive leaf’s closer is slow and the active leaf’s is fast, the coordinator has to hold the active leaf for longer than it was designed to, which wears the mechanism and makes the pair feel sluggish.
The usual causes are straightforward:
- One closer was replaced and the other was not, so they have different power and different sweep speeds.
- Latch speed on one unit has been cranked up to force a stubborn latch, which makes the door slam.
- A closer is leaking oil and has lost its damping altogether.
- The arm has been installed in the wrong position for that door’s swing.
Oil on the frame head or down the face of a door is the tell for a spent closer, and a unit that has lost fluid cannot be adjusted back into spec. Matching closers across a pair and setting both to the same sweep and latch speed resolves a surprising share of coordinator complaints without touching the coordinator, which is the first thing worth checking during commercial door closer repair on a pair.
When the exit devices are the problem
On a pair with vertical rod devices, the latching points are at the top and bottom of each leaf rather than at the edge. That adds places for things to go wrong. Bottom rods collect dirt and get bent by floor traffic. Top latches miss the strike when the door has dropped. The device on the inactive leaf can be out of adjustment in a way that leaves it resting against the strike rather than engaging it.
The giveaway is a leaf that feels latched until you pull hard, then opens. On a rated pair that is a live problem, not a nuisance, because the assembly is only doing its job if both leaves are positively latched. Sorting the rod adjustment is routine exit device repair work, but it has to be done after the doors are hanging square — adjusting rods to compensate for a sagging leaf just moves the problem.
A diagnostic order that saves time
- Watch the pair close from a full open position. Note which leaf arrives first. If the active leaf wins, look at the coordinator.
- Close each leaf by hand, separately. If each one latches fine alone, the hardware is sound and the problem is sequencing.
- Check the astragal is present and straight. Look for paint buildup, dents and missing fasteners.
- Compare the two closers. Same model? Same sweep speed? Any oil?
- Check the leaves for sag. Uneven reveal at the meeting stiles means hinge or frame work comes first.
- Only then adjust the exit devices.
Doing it in that order avoids the most common mistake, which is adjusting latches and rods to compensate for a geometry problem.
Frequently asked questions
Can I just remove the coordinator if it keeps failing?
Not on a pair with an overlapping astragal. Removing it means the doors can close out of order, which leaves the pair unlatched. If the pair is fire-rated, the sequencing is part of the assembly.
Why does one leaf latch and the other does not?
Most often the inactive leaf is closing second instead of first, so it never reaches the frame. Second most often, its vertical rods are out of adjustment.
The doors bang loudly when they close. Is that the coordinator?
Usually it is latch speed on one or both closers set too high, often done to force a latch that was not engaging. Fix the latch alignment, then back the speed off.
Do both closers on a pair need to be the same model?
Not strictly, but they do need matched power for the door sizes and matched speeds. Mismatched closers are a frequent cause of sequencing complaints.
In short
A pair of doors that will not latch is rarely a latch fault. It is an order-of-closing fault, and the coordinator, astragal and closers are what set that order. Check the sequence before you touch an adjustment screw, and check that both leaves hang square before you blame the hardware.
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