60 minute Automatic Fire Curtains

THERMAX - Telephone No. 0114 281 2281

T: 0114 281 2281

F: 0114 281 2277

E: sales@thermax.co.uk

Approved Standards


Tested to BS476: Part 22/22

Automatic fire curtain


Complete product tested to BS476: Part 22/22, and achieved a rating of DA (1000°C, above 60 minutes).

The fabric has a fire propagation index I =3.2 when tested to BS 476: Part 6. It is therefore rated Class 0 to the UK Building Regulations Approved Document B 1991.


The automatic fire curtain consists of an X32K woven glass fibre fabric. The fabric is tested to withstand temperatures of up to 1000°C for a period of 60 minutes minimum; this is wound onto a steel tube, each of which will incorporate a 24volt d.c. motor, a sealed heavy duty ball bearing assembly, and an electronic control circuit. The automatic roller assembly incorporation the fabric, is housed in galvanised mild-steel head box which is normally bolted to the fabric of the building.

The standard head box sizes are 180mm x 180mm. Larger head boxes may be required where the curtain drop is in excess of three meters. The lower edge of the curtain incorporates a twin inverted mild steel angle which acts as a weight bar to enable the curtain to unwind upon receipt of a signal from the fire alarm panel or total mains and battery failure. Metal side guides with a fabric retaining system shall be installed to provide a seal between the curtain fabric and the building construction.


Operation of the curtains is via the Group Control Panel which can either be mounted adjacent to the fire curtain head box within the ceiling void, allowing access for maintenance, or mounted in a remote position from the curtain. The panel requires a local 240v ac supply rated at 3 amps via an unswitched fused spur on a maintained supply installed by others.

For operational purposes the G.C.P must be connected to a normally closed volt-free contact within the fire alarm control panel configured to open on fire and fail safe. Each control panel is capable of operating up to six rollers and includes battery back-up which will maintain the curtains in their retracted position for a period of three hours during a mains failure. It is also possible to manually operate the curtains for twenty cycles during this period. Should the battery voltage fall below a pre determined limit, a low voltage cut off circuit will activate the curtain, which will descend in a controlled manner under the power of gravity.

The roller motors, which are 24volt d.c., must be wired from the G.C.P. in a ring main using suitably sized cable to ensure a voltage of 24v d.c -10%. The curtains automatically descend upon receipt of a signal from the fire-alarm panel and automatically retract when the signal is removed. During ascent the motors are controlled via a synchronised speed circuit to ensure all curtains are raised at similar rates. The curtains descend under the power of gravity at all times, including total mains and battery backup failure. Limit switches are not to be used to control the upper and lower positions of the curtains.

Optional Extras

Split drop delay
An optional braking system is available to allow a two stage descent during gravity deployment. Partial descent to a predetermined level to permit preliminary escape and initial smoke containment, after delay the barrier descends to full operational position.

Audible Warning
Audio or spoken multi message facility.

Beam protection and obstruction warning
A beam detector, with delay timer which will sound in the event of any obstruction being placed in the barrier drop line.

Visual alert system
Standard localized light or strobe light.

Emergency retract
Hold on retract facility for multi escape and emergency service access.

Walk through escape
Passage through the barrier.

Please view our automatic fire curtain technical specifications PDF (81kb)

Contact THERMAX for expert advice, design ideas and fast quotation for automatic fire curtains.

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THERMAX Contracting Services Limited


TEL: +44 (0) 114 281 2281 | Fax: +44 (0) 114 281 2277 | E-Mail. sales@thermax.co.uk

Registered in England Company Number 01973476