Fire roller shutter doors

As an authorised dealer of Hart Door Systems, all our fire shutters are LPCB certified and installed by fully trained Firas accredited engineers.

Introduction:

Fire roller shutters are manufactured by HART to ½ hour (30mins), 1 hour (60mins), 2 hour (120mins) and 4 hour (240mins) fire resistance specifically to customer requirements which will in turn be conditional on building regulations and insurance company requirements. The sizes range from small serveries through commercial to very large industrial doors. The recommended method of operation for all sizes is by electric motor, designed specifically for the purpose. These motor units provide ease of use, the necessary safe controlled automatic operation in the event of fire and satisfy health and safety recommendations. More traditional spring counterbalanced hand operated doors will provide marginally lower cost options but will have safety & operational considerations.

System Design Supporting Structure:

A: The structure supporting the roller shutter doorset must be a fire resistant separating element to B.S.476: Part 20,21,22: 1987 having a fire resistance greater or equal to that of the doorset itself, and must be capable of supporting for the fire resistance period without compromising the fire performance of the doorset. Consideration must be given to the loads imposed by the various doorset components i.e. endplates and the barrel support brackets. All concrete/masonry elements must be designed in accordance with B.S.5628: Part3: 1985 (code of practice for masonry) and have a density > 600kg/m³ . Lintels spanning the structural opening should comply with B.S.8110 (structural use of concrete): Part1: 1997 (code of design for design and construction).

B: Where rolling shutters are fixed to steel the steel must be insulated and thermal bridging effects considered where any insulation has been breached. Currently being tested and reviewed insulated steelwork may be used to support up to 2 hour fire resistance only. The LPC recommends that a critical temperature of 400°C and steel sections with a Hp/A value below 230m-1 are used for designing fire resisting steel supporting structures. Only steel supporting structures designed to these parameters are considered by the Loss Prevention Council suitable for supporting roller shutters. This assessment does not cover steel (without the above provisos), aerated concrete (with a density < 600kg/m³) or drywall partition systems without relevant test information.

Counter tops if required for shutter to close onto should be of Class 0 fire resistance.

Casing support brackets:

Required for 60 minute and over fire resistance (not 30 minute) These heavy brackets designed to support the casing and roller in a fire situation are to be equally spaced normally at less than 1500 centres, dependant on the size and fire rating required.

Approvals:

Building regulations require the use of certified products for resistance of fire. Insurance companies also have the same requirements. The Loss Prevention Council (LPC) is the approving authority for fire resisting products. They have tested, assessed and approved HART DOOR SYSTEMS fire roller shutters. They also monitor the ISO 9002 system that we operate to ensure standards are maintained during production and installation.

Operation in normal condition:

Electric systems provide ease of use with press button operation or, should the door be used for security or general purposes, a key operated option to prevent unauthorised use. For safety reasons the position that the door is operated from must be able to enjoy a full view of the entire door. ‘Constant pressure must be maintained on the button by the operator’ until the door is fully closed. Additional safety must be provided for pedestrians if this is not the case.

Automatic activation in fire condition:

Least cost option is that the door be activated by a sacrificial fusible link. This will activate the door independently when the heat around the link reaches approximately 75°C (other temperatures available). It will not be triggered by smoke& will require replacement before the door can operate normally again. Alternatively most frequently, a fire roller shutter will be part of an overall fire (and smoke) control system. The electrically operated fire roller shutter system’s solenoid when initiated
by a 24 volt DC 3amp supply, provided by the fire control system, will immediately commence the shutter to close at a controlled rate until it is fully closed. In the event of a fire test or false alarm the main fire control panel when reset, will allow the optional manual or auto re-set of the fire shutter to engage & return the system to normal operation after pressing the reset button. Various degrees of improving sophistication are available on request.

Pedestrian safety:

Will take precedence, when pedestrians commonly use the door. Audio-visual alarm coupled with delayed operation and or pedestrian photocells can be fitted. Safety brakes are fitted to all electric unsprung pedestrian fire roller shutters to prevent uncontrolled closure in the event of mechanical failure.

Hazard Analysis:

When the roller shutter is fully closed the elevated temperatures exhibited by the unexposed face of the shutter is sufficient to cause fire spread by radiant heat transfer. Sufficient distance is required for storing combustable materials from the face of the roller shutter as recommended in the ‘LPC Design Guide of the Fire Protection of Buildings’. For example, combustable materials would require a safe
distance of 3m from a 10m² fire roller shutter.

Finish:

Galvanised steel finish or powder coated in TGIC-free polyester in all BS and RAL colours. Plastisol finish available for shutters up to 2.5m² in a range of colours. Paint finish tested and approved to BS476:Part22.

Service and maintenance and testing:

Fire roller shutters must be regularly tested to ensure that they operate i.e. close on
activation by the fire control system. Power operated doors must be maintained to
manufacturer’s requirements to comply with the machinery safety in use legislation
and with the HSE recommendations.

Duty cycle:

Limited duty cycle is provided only providing one operation per hour dependant
on size of shutter and motor being either single or three phase. Should it be the
intention that more frequent operation is required this should be stated in the initial
enquiry and will need higher duty cycle equipment.