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Our Delta Technology Insulated Fire Steel Shutter (IFSS) is tested up to 4 hours of fire rating integrity & 4 hours fire insulation under BS EN1634. Under normal circumstances IFSS can be used as a conventional security shutter. In the case of a fire outbreak, IFSS is able to isolate and compartmentalize the fire. 

The IFSS features a single layer steel curtain design. No air gap; No double layers of curtain; No fabric finishing; Single layer even at 4 hours rating.


The curtain is constructed of a series of interlocking single continous roll formed steel slats. Each steel slat is a hollowed profile with infill fire insulation materials. The curtains are rolled up onto a barrel forming a drum via a heavy duty fire shutter motorised operator.

The IFSS is suitable to be used outdoor (IP rated motor required). It is commonly used in commerical buildings, industrial factories, logistic hub, ports, loading bay, substations, train/bus depot and mechnical carpark etc.


  • Tested to SS489:2015 & BS EN1634-1

  • Up to 4 hours of fire integrity and  4 hours of fire insulation

  • Single span up to 14.5m x 7.5m in dimension

  • Manually operated by hand chain 

  • Automatically operated by control box

  • Upon activation, the alarm will release the brake, thus allowing the shutter to close under gravity

  • A fail safe mechanism that includes a fusible Link that melts at 69°C causing the  shutter to slide down and close under gravity 

  • Intelligent System (IS) has a built-in Brake Re-engagement  Device that stops the shutter once it touches the ground 




Shutter Curtain 

The shutter curtain shall formed by interlocking custom designed continuous galvalume mild steel slats of 1 mm thickness. The slat has an overall nominal pitch of the slat shall be 140mm.

Side Guides

The guide rails shall be formed by mild steel ‘U’ shaped channel welded together, with an overall nominal dimension of 130mm (width) x 155mm (depth) x 1.5mm (thickness).

Bottom Bar

The bottom bar shall be made formed by “U” shaped channel with an overall nominal dimension of 20mm x 90mm x 20mm 1.5mm thick fitted on the bottom of the entire curtain.


Roller Barrel

It shall only consist of a single heavy-duty steel pipe, forming only a single barrel. The drive assembly is made up of steel circular plates fitted to the steel solid shaft round bar on one end and a circular plate with tri-legged slot on the other end.


Shutter Hood

The entire frame shall be constructed with 40mm x 40mm x 2.33mm thick steel square hollow section forming a truss structure. The shutter hood’s dimensions shall be between 760mm to 1140mm in height and 1020mm to 1440mm in depth. The driven sprocket shall be attached onto the end plate with a protruding tri-legged holder for the barrel. The frame shall be cladded with minimum 0.8mm thickness steel sheet.


Shutter Operation 


Each fire shutter shall be equipped with only 1 motorized operator. The shutter operator is equipped with built-in limit switch, built-in thermal protector, built-in brake release system, manual hand chain, and one unit of 3-ways push button (Up, Stop, Down) switch with cylinder lock integrated in a stainless steel cover. The limit switch shall ensure the shutter stops automatically at desired levels. In the event of power failure, the shutter can be operated manually by pulling the hand chain or cranking manual lever. 

Power Requirements

The power source is a single phase 230V x 13amp or 3-Phase 415V x 20amp, 50Hz each depending on the size of the shutter. 

Operating System

Motorized roller shutter can be operated by using the push button, which is located approximately 1.5 meters above floor level without counter balance system.

Fusible Link

The fusible link is a mechanical mechanism which shall activate the shutter to close and isolate fire when the fuse with a melting point of 69-degree Celsius melts. It shall descent the shutter down via gravity and gradually stopped upon closing for safety reasons.

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