A door that will not stay open is more than a daily irritation. On a busy loading route, workshop entrance or plant room, it can slow movement, damage the door and create a pinch-point hazard. The best door hold open devices keep a door where it needs to be without compromising fire safety, access control or the life of the closer.

The right answer depends first on one question: is this a fire door? A standard pedestrian door can use a straightforward mechanical retainer where suitable. A fire door needs a hold-open arrangement that releases automatically when the alarm activates, as part of a properly designed fire safety system. Getting that distinction right prevents a convenient fix becoming a serious compliance problem.

Best door hold open devices by application

There is no single device that suits every opening. Door weight, traffic level, wind exposure, floor condition and the door’s fire rating all affect the choice. In commercial and industrial settings, the most reliable option is usually the one matched to the exact door and how people actually use it.

Electromagnetic door retainers for fire doors

Electromagnetic retainers are the usual choice where a fire door must be held open during normal operation. The door is retained by an electromagnet, commonly mounted on the wall or floor, with a matching keeper plate on the door. When power is removed following a fire alarm signal, the magnet releases and the door closer shuts the door.

This arrangement is well suited to corridors, healthcare premises, schools, offices and service routes where staff need hands-free access. It is also useful where trolleys, wheeled bins or stock movements make manual operation impractical.

The key point is that the retainer is only one part of the system. It must be compatible with the fire alarm and release arrangement, correctly positioned, and supported by a door closer that can shut and latch the door reliably. The installation should follow the site fire strategy and applicable UK standards, including the principles set out in BS 7273-4 where relevant.

Wall-mounted units are often easier to inspect and keep clear, while floor-mounted magnets can suit situations where wall space or door geometry rules out a wall fixing. Floor units need careful consideration in wet, dusty or high-traffic areas, as damage and debris can affect performance.

Acoustic door retainers for existing buildings

Acoustic retainers listen for the sound of a fire alarm. They are usually battery-powered and can be fitted without wiring back to the alarm panel, making them attractive for occupied buildings or smaller retrofit projects.

Their main advantage is speed of installation. There is less disruption to finishes and no need to run a cable to every opening. For facilities teams managing several internal doors, that can reduce installation time considerably.

There are trade-offs. Acoustic devices need routine testing, battery checks and an environment where the alarm sound is consistently detectable. Background noise, closed doors, plant noise and changes to the alarm system can all affect suitability. They should not be treated as a fit-and-forget alternative to a wired system. If a doorway is particularly critical, a directly connected electromagnetic solution will often offer greater certainty.

Mechanical hold-open closers for non-fire doors

For doors that are not fire-resisting, a door closer with a mechanical hold-open function can be a clean, durable option. The hold-open point is built into the closer arm or slide channel, so there is no separate floor-mounted stop to create an obstruction.

These closers work well on staff-room doors, internal store doors, light commercial entrances and other non-fire openings where users regularly need the door held open. They can provide a neat finish and help protect walls from a door swinging too far.

Do not use a mechanical hold-open closer on a fire door unless the complete arrangement is specifically approved for that purpose. In most cases, holding a fire door open mechanically defeats the reason the door is there. A fire door needs to close when it is needed, not when somebody remembers to release it.

Kick-down door holders for light-duty doors

A kick-down holder has a rubber foot that drops to the floor when pressed down, holding the door open by friction. It is simple, inexpensive and easy to use, which makes it a familiar sight in workshops, small stores and back-of-house areas.

It is best reserved for lightweight, non-fire doors on clean, level floors. It is not ideal for heavy steel doors, high-traffic routes or areas exposed to rain, oil, dust or frequent washdown. The rubber foot wears, smooth floors reduce grip, and a strong draught can still move the door. Used in the right place, it is useful. Used on the wrong door, it becomes a recurring maintenance call-out.

Magnetic catches and cabin hooks for low-risk openings

A simple magnetic catch or cabin hook can hold a gate, cupboard door or light internal door in an open position. These are generally suitable only for low-risk, non-fire applications where there is no requirement for automatic release.

They are not appropriate substitutes for fire door retainers, nor are they suitable where a door could be caught by wind or exposed to force from passing trolleys. On external doors and exposed service doors, the fixing points and surrounding frame material need particular attention. A small hook may hold a door on a calm day but fail when the weather changes.

What to check before choosing a hold-open device

Start with the door itself. Measure its width and height, identify the material, check whether it is single or double leaf, and establish whether it is fire rated. The door closer matters as much as the retainer. If the closer is too weak, poorly adjusted or damaged, the door may not close and latch after release.

Next, consider the environment. A warehouse cross-passage may be affected by pressure changes, forklift traffic and strong draughts. A clean office corridor has very different demands. Floor-mounted equipment is more vulnerable in busy industrial routes, while a wall-mounted retainer may be exposed to impact from trolleys or pallets if positioned badly.

Think about the operation people need. If staff are repeatedly passing through with stock, a device should release without anyone having to bend down or manually disengage a hook. If the door is only occasionally held open for deliveries, a simpler mechanical solution may be adequate, provided it is not a fire door.

Finally, check the building’s fire risk assessment, alarm arrangement and maintenance responsibilities. A hold-open device should be tested as part of the site’s regular fire safety checks. The release must allow the door to close fully, the latch must engage, and nothing can be left obstructing the swing path.

Common mistakes that cause problems

The most common mistake is wedging open a fire door. Timber wedges, bins, extinguishers and improvised hooks may seem harmless during a busy shift, but they stop the compartmentation that limits smoke and fire spread. Remove the wedge and use a properly specified release device instead.

Another frequent problem is specifying for the opening but not the conditions. A light-duty floor holder may look suitable on paper, then fail quickly on a rough concrete floor or where doors are pushed open by a pressure differential. Similarly, an electromagnetic retainer cannot compensate for a closer that is incorrectly adjusted or a warped door that drags on the frame.

Avoid treating a door hold-open device as a standalone purchase. For a dependable result, check the retainer, closer, latch, hinges, frame and alarm interface as one working system.

Installation and maintenance matter

Correct positioning is essential. The device needs to hold the door securely without pulling it out of alignment or placing undue strain on the closer arm. It must also release cleanly. A door that is retained at too wide an angle can strike walls, shelving or equipment as it closes.

Once installed, test the device under normal site conditions. Open the door fully, release the retainer, and watch the full closing cycle. Check that the latch engages from every expected position, not just from one carefully controlled test. For fire doors, carry out the agreed alarm-release test and record the result within the site’s maintenance process.

For hard-to-identify retainers, closers, arm assemblies or matching keeper plates, clear photographs, dimensions and any markings from the existing part make sourcing far quicker. Door Spares UK can help through Ask Dora when the original device is obsolete or the exact part is unclear.

A door should stay open only when operations need it to, then close without hesitation when safety demands it. Specify the device around the door, the building and the risk, rather than choosing the quickest-looking fix.