Terror Screen SR4 - LPS1175 SR4 Security Shutter

LPS1175 SR4 British manufactured Security roller shutters

Security Rating 4 is classified as high commercial risk and medium government risk. SR4 optimum weight and strength combination the twin skin steel lath is re-enforced by aluminium sub structure highly resistant to cutting. Our highest rated security shutter. SR4 security shutters provide a high security weight and strength combination through the twin skin steel lath, re-enforced by an aluminium substructure which is highly resistant to cutting.

Protect your business with these doors, tested to withstand 20 minutes of attack, including 10 minutes with drills and hand tools.

The products are tested and provide resistance to tools in Category A, B & C (as specified for SR3) plus D (below). The tools of this category is for experienced attempts at forced entry.


The maximum attack time is 10 minutes. The maximum test duration is 30 Minutes


“A-tool” lock puller, Battery, Bolt Cutters, Drill bits, Felling/fire axe , General purpose saw/ Hole saw, Grinder, Hooligan bar, Jigsaw, “K-tool” lock remover, Plate shears, Sledgehammer

Steel wedges, Tube 75mm diameter x 500mm long


BS EN 1303 class 4


Reinforced brickwork/blockwork, reinforced concrete or structural steelwork

If you’d like to speak to us about how we can help you solve logistical challenges with a completely tailored high-speed door solution, please contact us today on +44 (0) 191 214 0404

Colour Options

Optional plastisol coating on the laths and optional powder coating of guides and bottom rail and any other associated parts Standard RAL colours

Size Options
  • Up to 9m high
  • Up to 9m wide
Speed Options
  • Standard opening – 0.15m sec
  • Standard closing – 0.15m sec

Features & Benefits

  • Attack Prevention
  • Security performance
  • Asset protection
  • Public Safety
  • Unauthorised access restriction
  • Insurance compliance
  • Reduced risk of crime

What Hart Has To Offer

1 year warranty
as standard

CE/UKCA mark

Designed and
manufactured in UK

LPCB approved

Design Options

  • Size: Custom- size up to 9000 mm
  • Various locking options available, from simple pin locking to fully automatic operation
  • Choice of colours and finish
  • Lock status signal options
  • Hood covers
  • Choice of operators
  • Infills and Flashings

See NBS Specification


  • Banks
  • Military Installations
  • Government buildings
  • Museums
  • Nuclear Facilities
  • Detention Centres
  • Prisons
  • Chemical Industries
  • Airports
  • Data Centres
  • Hazardous Environments
  • Security Risk Control Buildings
  • Warehouses

Related Case Studies

Manufactured to International Standards


Depending on door size the motor drive is constructed using either Safedrive direct drive or via chain drive and reduction gearing supported via a safety brake. Very large sizes may also have internal counterbalance springs to reduce operating loads and minimise the drive requirements



Doors are available from 1.2 metre wide to 9 metres wide and up to 9 metres high. All doors are made to measure to specific requirements. For a high security shutter with extreme wind rating we recommend our unique Typhoon security shutter.


Roller shutter door electrically operated utilising a steel twin skin door curtain of twin interlocking roller shutter section with internal strengthening to resist cutting. The construction of the door curtain is 60Kg’s per square meter and it runs within reinforced side guides of fabricated steel.


  • Manually operated slip bolts on the bottom rail or pin locks on the guide, manually interlocked to the control panel to prevent accidental operation.
  • Electrically operated by press button when the door is closed
  • Fully automated.
  • Optional Monitoring and signalling of lock status.

Bottom Latch

The door curtain is finished at floor level with a structural bottom beam fabricated from steel and aluminium sections and optionally finished by rubber seal. Available up to 9m without need for locking at the centre of the rail.


The door can be press button operated or automatically operated. Various levels of safety can be incorporated which are obligatory if automated operation is required, including safe leading edge and or photocells movement sensors Radar, radio and so on. Controls should be mounted at least 1m from the door structure, unless additional features are added


Structural opening substrate must be suitably reinforced brickwork/concrete/steelwork as detailed in the standard LPS1175 Issue 7. It is assumed that the substrate onto which the product is fitted provides a resistance to attack at least equivalent to that afforded by the product itself.



Standard opening Speed: 0.15 m/s
Standard Closing Speed: 0.15 m/s

  • Manufactured under ISO 9001:2015
  • Machinery Directive 2008 26/42/EC
  • BSEN 12453 & BSEN12444 the machinery directive safety in use of power operated doors
  • BSEN 12978 Safety devices for power operated doors
  • BSEN 12625 – requirements for the safe installation and use

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