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Technical Advice

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Security Doors – BSEN 1627 Level 4

Better Built Doorsets

Guardian ENV 4 Security Doors are designed to protect medium to high risk properties from experienced attempts at forced entry, regardless of noise, using heavy hand and battery tools or explosives. Security with asthetics.

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Standard Specification
Door Leaf

50mm thick, 1·5mm corrosion resistant Zintec/Aluzinc sheets as standard, wide variety of colours and finishes available. Also Stainless Steel.

Filled with solid timber cored with internal stainless steel steel anti-attack skin..

Doorblade manufactured from two 1·5mm sheets lockformed together, by bonding two steel skins around a rigid core.

A total steel armour thickness of 4·5mm.

Blade fitted with an anti-jemmy astragal.


Folded and welded from 1·6mm Zintec/Aluzinc.

Fully welded, variable sub-frame supplied as standard to accommodate site tolerance of -0/+30mm.

The sub-frame providing additional protection to the fixings against jemmys. Fitted with stainless steel dog bolted continuous hinges for additional security.

Guardian Security Rated ENV 3 Frame


Standard: 15mm rebated threshold

Optional: 5mm driveable (DDA compliant), 12·5mm 564A Aluminium (DDA compliant)

Guardian ENV 2 Threshold

Guardian ENV 2 Threshold


Standard: Pre-primed steel (approximating to BS10A05 Goosewing Grey) requiring site painting.

Optional: Polyester Powder Coating from standard colour range.


Doors are custom manufactured in 10mm increments for single openings 690mm to 1390mm and double openings 1290mm to 2600mm, at heights up to 2900mm.

Secure Locking

A centre High Security WAAA1100 Sashlock combined with two similar Deadlocks in the upper and lower quarters of the door. All locks fitted with anti-jemmy escutcheon and welded shroud. Locks are anti-drill and pattern protected to reduce risk of key copying.

Alternatively high security multi-point panic hardware for fire escapes


Heavy duty and vulnerable properties, probably with a prior record of attempts at forced entry.

Protection from experienced attempts at forced entry of commercial properties with no regard for noise.

Further the door is suitable for protection against attempted entry by explosive blasts.

Note: All duty recommendations assume the doors are used in conjunction with other comparable levels of security at windows, etc.


Tested to prEN 1627 - 2007/09. Security Level 4.

The test involves a determined attack over a period of 30mins. using a selection of hand and battery tools including club hammer, cordless drill, cold chisel and axe. (see ‘Practical Attack Element of Test for full details’.)

Locks Anti-drill tested to BS EN 1303 Security grade 6.

ENV 4 doors have been tested and passed EXR2 of BS EN 13124-2, the Explosion Resistance standard, with explosive blasts using plastic explosives.


Peace of Mind Warranties

All our products are guaranteed against defect of material or workmanship by Guardian Doors, subject to correct, maintenance and operation, for a period of 12 months from the date of installation. We offer extended warranties for up to 5 years with an agreed maintenance contract. Contact us for more details.

Maintenance Packages

Planned preventative maintenance

See our maintenance section or contact us for more information. Guardian's repair and maintenance services and engineers are accredited to the DHF's TS004 Repairs and Maintenance standard.

It is a legal requirement - as failure to show evidence of maintenance could mean prohibition & enforcement notices being served and fines up to £5000 and imprisonment for 2 years. 'Safety In Use' - the New European CEN Standards legislation - states that all types of door should be maintained in an efficient state, in efficient working order and in good repair. For further clarification visit

Routine maintenance prolongs the operational life of the installation and ensures that the installation is kept in good working order - helping to prevent accidents and damage which in turn results in down time, effecting work flow, productivity and resulting in loss of revenue. It assists in identifying potential problems which can easily be rectified.

Peace-of-Mind Warranties

All our products are guaranteed against defect of material or workmanship by Guardian Doors, subject to correct maintenance and operation, for a period of 12 months from the date of installation.

Registered Office

45 Progress Road
0800 7836602
+44 (0)1702 260117
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Established in 1979, Guardian Industrial Doors design, manufacture, supply and maintain industrial and commercial roller shutters, doors and gates.

©2015 Guardian Doors