Fire Shutter Explained: Types, Operation and SCDF Rules

A fire shutter is a fire-resisting curtain that stays rolled up or retracted in normal use and closes automatically when a fire is detected. It allows a building to have large openings, such as wide shopfronts, conveyor openings, atrium edges or service counters, while still being divided into fire compartments when it matters. Because it only works if it closes fully and on time, it is one of the fire protection elements that most depends on design, interfaces and maintenance.

This article explains how fire shutters work, the common types, the requirements set by the SCDF Fire Code in Singapore, and the practical issues engineers and building owners should watch for.

What a fire shutter is for

Fire safety in buildings relies heavily on compartmentation: dividing the building into cells bounded by fire-resisting walls and floors, so a fire is contained long enough for people to escape and firefighters to act. Openings in those walls are the weak points. Small openings are closed by fire doors, as described in our article on fire-rated doors. Where an opening is too wide, too high or needs to be open all the time, a fire shutter is used instead.

Typical locations include:

wide openings between parts of a shopping centre, warehouse or factory that are in different compartments;
the edges of atria and escalator voids, to stop smoke and fire spreading between floors;
openings for conveyors, service hatches and kitchen counters;
openings between two adjoining buildings.

Types of fire shutter

Shutters are classified mainly by construction and by how they close.

By construction

Steel roller shutters. Interlocking steel slats rolled onto a barrel in a box above the opening. Insulated versions have a filled slat or added insulating layer to limit heat transfer.
Fabric fire curtains. Woven glass-fibre or similar fabric that rolls into a compact head box. They are lighter and suit tight ceiling spaces and wide spans, and are often used as smoke curtains.
Sliding or folding shutters. Panels that move horizontally, used where there is no room above the opening.

By operation

Gravity-closing. On a signal from the fire alarm or the melting of a fusible link, the holding mechanism releases and the curtain descends under its own weight at a controlled speed. This is fail-safe: loss of power causes closure, not failure to close.
Electrically operated. A motor drives the shutter down on receiving a signal. These need a secure power supply and fire-rated cabling, since the shutter depends on power to close.

Fire shutter requirements under the SCDF Fire Code

In Singapore, fire shutters are governed by the SCDF Code of Practice for Fire Precautions in Buildings, commonly called the Fire Code, whose current edition was published in 2023 and has since been amended in batches. The Code sets out where shutters may be used and how they must perform. In general terms:

A fire shutter may form part of a compartment wall, but it is not permitted for the compartmentation of certain critical areas, such as the fire command centre and protected means of escape like exit staircases and smoke-free lobbies.
Where it protects an opening in a compartment wall, the shutter must have fire resistance, including insulation, not less than that of the wall, with some relaxations of the insulation requirement for shutters at the edges of atria and voids.
Common fire shutter types are required to comply with the relevant Singapore Standard, SS 489.
Gravity-type shutters must descend at a controlled rate when released by the fire alarm system or a fusible link. Electrically operated shutters must have a backup emergency power supply and fire-rated power and signal cables.
There are limits on closing time and speed: for example, the Code requires shutters up to 6 m high to close fully within 30 seconds of activation, with a maximum descent speed of 0.2 m per second, and allows longer for taller shutters.
Shutters at atria and voids are typically required to be electrically operated and triggered by smoke detection in the relevant zone.
Occupants must not be trapped: spaces enclosed by a shutter need an alternative exit, such as a side door or wicket door, and signage is required where descending shutters would obscure exits.

The Code is updated periodically, so designers should always work from the current edition and amendments, and the Qualified Person is responsible for showing compliance in the fire safety plans submitted to SCDF.

Design and interface issues

A fire shutter is not a standalone product; it is part of a system. Most problems arise at the interfaces.

Detection and controls. The shutter must receive the right signal from the right zone. Its integration with the fire alarm system should be designed and tested, including what happens on a fault.
Head box and support. The barrel and box can be heavy. The supporting structure, whether a beam, slab soffit or steel frame, must carry the weight and dynamic forces of closing, and must itself have adequate fire resistance so the shutter does not fall with its support.
Guides and fire-stopping. Side guides must be fixed to fire-resisting construction, and gaps around the head box and guides must be fire-stopped to the same standard as the wall.
Clear drop zone. The path of the shutter must stay clear. Display racks, furniture and stock left under the shutter are a recurring failure in retail and warehouse premises, which is why the Code calls for keep-clear warning signs.
Safety of people. The descent speed limit and safety edges reduce the risk of injury to people passing under a closing shutter.

From a structural point of view, adding a shutter to an existing building often means adding load to a beam or slab edge that was not designed for it, and drilling fixings near reinforcement. These details should be checked rather than assumed.

Testing, maintenance and the Fire Certificate

A fire shutter that does not close is worse than useless, because it creates a false sense of security. Shutters need regular inspection and test drops by competent persons, following the manufacturer’s recommendations and the requirements for maintaining fire safety installations. Typical checks include the release mechanism, governor or speed control, batteries and power supply, the condition of slats or fabric, guides, bottom rail and seals, and the interface signal from the alarm panel.

For buildings that require a Fire Certificate in Singapore, fire protection systems, including shutters, must be maintained in working order and are covered by the annual renewal process. Our article on the fire safety certificate in Singapore explains which buildings need one.

Any alteration that affects a shutter, such as moving it, changing the opening size or altering the compartment layout, is likely to need fire safety plan approval. Unauthorised changes to fire protection works are a regular finding during inspections.

Fire shutter or alternative?

Shutters are not always the best answer. A fire-rated wall with fire doors is simpler and does not depend on a mechanism. Fire-resisting glazing can keep views open while providing compartmentation, at a cost. Sprinkler-protected openings or alternative fire engineering solutions may be acceptable in some cases, subject to SCDF approval. The right choice depends on the building’s use, the fire strategy and the operational needs of the space.

When shutters are added to an existing building, the structural support, fixings and fire-stopping should be designed together. A structural engineering consultancy can check the supporting members and coordinate with the fire safety engineer.

Frequently asked questions

How fast must a fire shutter close in Singapore?

The SCDF Fire Code sets closing time and speed limits. For shutters up to 6 m high, it requires full closure within 30 seconds of activation, with a descent speed not exceeding 0.2 m per second; taller shutters are allowed longer. Always confirm the figures against the current edition of the Code.

What is the difference between a fire shutter and a smoke curtain?

A fire shutter is designed to resist fire for a stated period and may form part of a compartment wall. A smoke curtain is designed to control the movement of smoke, for example to form smoke reservoirs or protect atrium edges, and may not provide fire resistance. Some fabric products are tested for both roles.

What happens to a fire shutter if the power fails?

Gravity-type shutters are designed to close on loss of power or when a fusible link melts, so they fail safe. Electrically operated shutters depend on power to close, which is why the Code requires an emergency power supply and fire-rated cabling for them.

Can I place furniture under a fire shutter?

No. The area beneath a shutter must be kept clear so it can close fully. Obstructions are a common reason shutters fail during inspections or real fires, and the Fire Code requires keep-clear signage near the descent path.

How often should fire shutters be tested?

Testing frequency depends on the manufacturer’s recommendations, the building’s maintenance regime and regulatory requirements. Regular functional drop tests and servicing by a competent contractor are standard practice, with records kept for the Fire Certificate renewal where applicable.

Adding or relocating fire shutters in an existing building and need the supports checked? Talk to our consultancy or get in touch.