Smoke and Fire Curtains Ltd specialises in the manufacture, supply, installation and maintenance of automatic fire and smoke curtains; this system is similar to a roller shutter but has a curtain made of a woven fibre glass fire-resistant material and comes with an electronic control panel and battery backup system in case of a power failure.

The frame work of the fire curtain consists of a top box, a pair of specially folded side guides, a glass fibre curtain and a bottom rail. A control panel is supplied to work in conjunction with the fire curtain unit.

A drawing is provided to detail these parts:

Single Barrel Fire Curtain 3D

The steel top box holds the steel barrel which in turn houses the 24vdc tubular motor. The purpose of the barrel is to carry the curtain and allow the curtain to descend and rise in a uniform manner. The curtain remains concealed in its top box until activated by a heat or smoke alarm. Our control panels are programmed to work with the building fire alarm system (or standalone detector) and to control the low voltage motor, emergency retract facilities, split drop functions, beam sensors etc.

The fire curtain provides both fire and smoke compartmentalisation, allowing for a safe passage of escape; this is ideal for servery hatches, lobbies and stairwells in schools, hospitals, museums, offices, retail outlets and as an alternative for fire doors in properties where there is limited space. The fire curtain can be recessed into the walls and ceilings in order to achieve an aesthetic look ideal for domestic properties.

The fire curtain comes in various standard fire tested ratings, 1 hour and 4 hour or as an Insulated zone standard.

The brand names for our products are:

  • FireSafe 60 – provides 1 hour of fire integrity protection
  • FireSafe 240 – provides 4 hour of fire integrity protection
  • FireSafe Plus – this provides 150 minutes fire integrity and insulation (minimal heat transfer to the non-fire side of the curtain).
  • SmokeSafe – provides smoke only protection to be used in conjunction with ventilation systems

The steel top box holds the steel barrel which in turn houses the 24vdc tubular motor. The purpose of the barrel is to carry the curtain and allow the curtain to descend and rise in a uniform manner. The curtain remains concealed in its top box until activated by either the fire alarm panel or an individual smoke or heat detector.

The curtain may be constructed in sections and sewn together with stainless steel sewing thread. On both edges is a row of retaining studs, spaced out accordingly so as to stop the curtain from slipping out of the side guides. The side guides both have a gap of 6mm to 8mm for the curtain and bottom rail to slide up and down, but it is not wide enough for the retaining studs to pass through the gap, therefore keeping the curtain retained in a final position during any fire or emergency situation.

The bottom rail is designed to aid the descent of the curtain and to stop the curtain from lifting up in the event of a fire.

The fire curtain comes in various standard fire tested ratings, 1 hour and 4 hour or as an Insulated zone standard.

The curtain units have a control panel which instructs the curtain to come up or come down during the descent period, and to act according to our instructions once the client’s fire alarm system is triggered. All of our control panels have a battery back-up system.

The input power is normally 240v ac and this is solely to power the transformer, which changes the operating current to a 24v dc supply. This 24v dc applies to the printed computer board, the tubular motor, the over-ride switch, the key switch, the beam sensor, the audio-visual unit and the top limit sensor (please refer to the attached specification sheets for descriptions and technical details of these accessories).

Motors

There are two types of motors; the standard drive-up drive-down motor and the GFS motor. The Gravity Fail Safe motor is normally used for emergency escape routes and the drive-up drive-down motor for windows and servery hatches. The drive-up drive-down motor is designed to wind down automatically when it receives a signal off the alarm; but it will not drive down when the all power is removed from the unit, without a battery back-up system which is included with all of our control panels.

The GFS motor is specially designed to backwind when the brake power is removed from the unit. This creates a gravity failsafe method to ensure that when all power is removed or fails the curtain will descend under gravity, aided by its own weight.

Side Guides

Fire curtains require side guides to provide a seal between the fabric and the structure of the building. A fire will cause either positive or negative pressures, these pressures can cause a curtain to act like a sail and pull the curtain fabric out of the side guides. Therefore a fabric retaining system is used to prevent this occurring.

A smoke curtain “may” have no side guides and is intended to retain some or most of the smoke in a ceiling reservoir. These are mainly used in shopping malls, where people will have ample room and time to exit the building. Some gaps are permitted at the edges and the overlapping of the smoke curtains is normally only 200mm.

Multiple Barrels

Once the curtain gets to over 6 metres wide it is split into two or more barrels due the weight of the material. The barrels are overlapped by 600mm to ensure no passage of fire or smoke. When overlapping barrels are needed they are positioned one above the other to ensure the curtains descend together, forming a complete fire barrier.

Top Box Sizes

  Single Barrel Fire Curtains Multi-Barrel
Fire Curtains   
Material 160mm x 160mm 180mm x 180mm 200mm x 200mm 200mm deep x 400mm high 400mm deep x 200mm high
1 Hour (Firesafe 60) ≤2.5 metres high and wide ≥2.6 ≤3.5 metres high and wide ≥3.6 metres high and wide ≥6 metres high and wide ≥6 metres high and wide
4 Hour
(Firesafe 240)
≤2.5 metres high and wide ≥2.6 ≤3 metres high
≥2.6 ≤3.4 metres wide
≥3.1 metres high and wide ≥6 metres high and wide ≥6 metres high and wide
Insulated Zone
(Firesafe Plus)
≤2 metres high and wide ≥2.1 ≤2.9 metres high and wide ≥3 metres high and wide ≥6 metres high and wide ≥6 metres high and wide

Side Guide Sizes

Material 70mm wide x 53mm deep 100mm wide x 53mm deep
1 Hour (Firesafe 60) ≤2 metres high and wide ≥2.1 metres high and wide*
4 Hour (Firesafe 240) ≤2 metres high and wide ≥2.1 metres high and wide*
Insulated Zone (Firesafe Plus) ≤1.5 metres high and wide ≥1.6 metres high and wide*

*Please note all multi-barreled fire curtains of 6 metres and over must use the 100mm side guides.