FAQ Security Systems

Security systems engineering is a broad, complex field. The FAQ section will shed light on some of the more puzzling issues and provide answers to important frequently asked questions.

Resistance classes classify the capacity to resist burglary. They define how resistant windows and doors are to attempted break-ins. The higher the class, the longer burglars need to force entry and the more likely it is that they require professional tools.

These resistance classes are divided up according to the tools and work methods used in order to make a comparison on a European level and categorise such elements in line with EN1627-1630.

EVVA keys are protected in several different ways to ensure unauthorised key copying is as difficult as possible:

1. Technical & technological key protection

EVVA locking systems are developed in the in-house design department and meet very high technical standards. They can only be manufactured using specially constructed machines.

2. Managed key protection

Only authorised key holders are able to order new keys from EVVA or an EVVA partner. A security card supplied with the cylinder upon purchase is used to identify such key users.

3. Legal key protection

All EVVA locking systems and key profiles are patented.

Always measure from the middle of the mortise lock guard (cylinder fastening screw) to the outer edge of the door, including the fitting width.

36 mm (length A)+ 31 mm (length I) = 67.0 mm total length i.e. 36 + 31 = DZ 36/31


You can find information here on how to install, use and look after your cylinders properly.
on how to install, use and look after your cylinders properly.

Emergency opening with BSZ function

A locking cylinder can be blocked from functioning when a key is inserted in the lock. This can pose a safety hazard, particularly in the event of an emergency. What can be done, for instance, if a member of your family or a hotel guest always leaves their key in the lock on the inside and there is an emergency? The solution: EVVA double cylinders can be optionally fitted with a BSZ function. BSZ is a function which allows the cylinder to be locked from both sides, even if an authorised key is inserted on one side of the door.

Emergency opening with override function

In the event of an emergency, controlled access to all rooms must be possible at all times, particularly in companies. EVVA offers the option of a so-called lock override: This is when a person with an authorised key can take the locking system general master key (GMK) or group key in a controlled way and thus have access in the event of an emergency.
The general master key must also be available to emergency services such as the fire service in the event of a fire or other emergency. The key can be securely stored in an EVVA tubular safe.

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