Automatic Smoke Curtain

ASB smoke curtain is an electrically operated automatic smoke curtain used to form a continuous barrier against smoke in the event of a fire.

To ensure that the fire integrity of the smoke curtain is maintained, all critical components such as the head boxes, bearings, bottom bar and roller are manufactured of steel.

The curtain head box is manufactured from 1.2mm galvanised steel, with a standard size of 181.2mm x 150mm for single rollers (maximum width 5m) and 234.4mm x 150mm for multiple rollers (over 5m wide). This enclosure is rated at the same temperature as the curtain fabric.

A steel bottom bar is provided to prevent deflection and it is weighted to ensure correct operation under gravity. A 24 volt DC motor, a gear box and a sealed heavy duty ball bearing assembly is incorporated in to the steel roller. A motor control unit housed in a steel enclosure is mounted onto the motor end of the head box.


Product tested to EN 12101/A1:2006

Designed to operate for 1000 cycles at normal ambient temperatures up to 600° C for over 120 minutes for once only.

The fabric has a Class 1 surface spread of flame when tested to BS 476 : Part 6 and BS 476 : Part 7. It is therefore rated Class 0 to the UK Building Regulations Approved Document B


The curtain fabric has a nominal weight of 0.48Kg/m2 and is tested to withstand temperatures up to 600° C for a period of 30 minutes.
Note: Options of the curtain fabric to withstand up to 1000° C for 2 hours are also available upon request.

Control System

In normal operating conditions the curtain would be held by the motors in the retracted position operating at low voltage.

Upon activation of the smoke detectors, the control panel will remove the supply voltage and the curtain will descend under the power of gravity in a controlled manner. The system must
fail safe to the operational position on total loss of primary and auxiliary power.

A dynamic braking system housed in the motor control circuit controls the speed of descent of the curtain, this is to retract the curtain,the motors drive the curtains to the up position. As
the bottom bar hits the curtain head box, a current limiting circuit steps back the voltage and current and holds the bottom bar in the retracted position. Limit switches are not to be used to control the upper position of the curtain.

Upon the mains supply failure, the supply is automatically switched to the integral standby battery. The curtain shall remain in the retracted position for 1 hour (fully loaded system).

Approved Standards
EN 12101-1:2005+A1:2006 and EN1363-1 Temperature / time resistance
EN 12101-1:2005+A1:2006 Reliability and response time
EN 12101-1:2005+A1:2006 and N1634-3:2004 Permeability of material to smoke
BS 476 : Part 6 : 1989 Fire propagation test
BS 476 : Part 7 : 1997, Class 1 rating Fire surface spread test
Achieved Class 0 rating Fabric fire test
Installation Details

Installation details of Automatic Smoke Curtain

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