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Technical Advice

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Security Doors – BSEN 1627 Level 3

Better Built Doorsets

Guardian ENV 3 Security Doors are designed to protect medium risk residential or commercial properties from attempts at forced entry, with little regard for noise, using heavy hand tools. Security with asthetics.

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Standard Specification
Door Leaf

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 mineral wool and integral steel stiffeners.

Doorblade manufactured from two 1·5mm sheets lockformed together, by bonding two steel skins around a rigid core. A total steel armour thickness of 3mm.

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. The frame is fitted with 3no. Class 13 stainless steel hinges with 2no. security dog bolts for 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

High Security triple point high security sashlock with High Security cylinders and antijemmy escutcheon protecting against snapping attack. Lock is anti-drill and pattern protected to reduce risk of key copying.

Alternatively high security multi-point panic hardware for fire escapes


Medium risk residential and commercial properties which may be obscured from view.

Protection from a deliberate forced entryof a well protected property using a wide variety of tools with little regard for noise.

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

The ENV 3 door can offer 240min. fire rating if fitted with appropriate ironmongery


Tested to prEN 1627 - 2007/09. Security Level 3.

The test involves a determined attack over a period of 20mins. using a variety of tools including hand hammer, hand drill and crowbar. (see ‘Practical Attack Element of Test for full details’.)

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


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