Twin Skin Fire Shutters

Product Code: FR-INS4H

Product Description
Our twin skin steel shutters are the most effective way to secure an opening and/or compartmentalise against a spreading fire.
Unlike single skin fire shutters, this model provides incredible radiant heat protection. To put this into perspective, normally if a fire was raging at 1200°C on the other side of a standard fire shutter you wouldn’t be able to stand within 6 metres of the opening. However, due to the FR-INS4H’s unique construction, the radiant heat levels around the roller shutter door drop from 65kw sq metre to an incredible 2.7 kw sq metre. 
The FR-INS4H also offers a 20dB sound reduction value meaning they are good to use in kitchens where the room next door may also used for meetings or exhibitions. 
These fire-rated doors are fitted with safety brakes, coupled with ‘drive ratio control’, in order to manage controlled descents. Furthermore, we can incorporate one of our interface panels so that the roller shutter closes automatically when the fire alarm is set off.
Ideal Uses
  • Warehouses
  • Factories
  • Hospitals
  • Large commercial buildings
  • Airports
  • Canteens
  • Restaurants
Key Features
  • Offers 20dB sound reduction value
  • Provides radiant heat protection
  • Tested up to 240 minutes of fire protection
Technical Specifications


The curtain is normally constructed from laths comprising a synthetic material outer skin bonded to a special inner core consisting of high performance insulation materials.

Stainless steel cables connected the laths together and are fastened to the roller at the head. 

The bottom rail comprises a standard lath fitted with an extruded PVC bottom seal. 


Manufactured from galvanised steel and shaped into a channel profile which is prepared for bolting to the structure by means of continuous fixing angles. 


Manufactured from galvanised steel of adequate thickness relative to door size and supplied with steel plates for fixing to the structure.


A combination of galvanised steel and ‘u’ profile and MDF board with a special fire protection cover fastened to the lintel into which the top of the door engages providing an effective seal against the passage of flames and hot gasses. 


The barrel comprises a steel tube of suitable diameter and wall thickness to avoid deflection. Steel shafts and discs are inserted at each end and the whole assembly is supported at each end on the end brackets. 


Our Fire rated shutters are typically installed with an induction motor, an electromagnetic brake, limit switches and a fusible link. The design provides a reliable system that will close the shutter automatically in the event of a fire situation. 

A controlled descent comes as an inbuilt safety feature. 

In the event of a power loss, manual operation can be attained. By releasing a pull cord close to the shutter under controlled descent and a hand chain to open again. Every fire shutter is individually operated from a control station, incorporating open/close/stop push buttons positioned adjacent to the shutter guide. 

A 24-volt DC auto reset solenoid is available for linking into the fire alarm or BMS. 


As standard, the curtain is self-finished light grey with the perimeter intumescent seal in black. 

Options & Variations


Galvanised steel hoods can be supplied to cover the coiled shutter and motor. 


Can be Polyester powder coated in a range of standard RAL colours’ for an extra charge. 



We can be found on RIBA’s Product finder and NBS Plus making specifying the roller shutters on your project particularly easy.



There are three main methods for fixing your shutter to the aperture. Use our measuring guide to obtain the most accurate quote.



If you have any questions please get in touch with our team on +44 (0) 1384 221743.

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Out and about? Our new app will allow you to measure apertures for our roller shutters.