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As an emergency only means of escape, the door should be fitted with an (emergency use only) glass break lock to minimise unauthorised use (e.g. staff popping out for a quick cigarette), an alarm device to indicate in the control room when the door has been opened, and ideally a PIR (Passive Infra Red) movement sensor to detect people ‘hanging around’, particularly outside.

The overall lighting levels would be very low maintained.

The camera is not really required to fulfil much of a deterrent role, particularly as there are visible warning signs indicating that the door has been fitted with an alarm to deter unauthorised use.
 

The cameras primary function is to:-

a) provide a visual confirmation that there are persons loitering,

b) show that the door has been opened in an emergency,

c) confirm when unauthorised individuals have managed to gain access.
 

Constant ‘back up’ video recording should normally be provided as a matter of course.

Given these circumstances, the specification for the camera may not necessarily need to be any better than a high performance, high sensitivity Black & White unit.

The image itself does not need to be constantly displayed in the control room, unless triggered by an alarm (door sensor or PIR) or movement detection equipment.
 

This approach would obviously exclude one (or perhaps many) camera(s) from constant control room monitoring, particularly as 99% of the time, there is absolutely nothing to see but a closed door!. ... so one simple way to remove some of the load, from the already overworked system operators.

More information on developing a System Profile >>>

The Fire Exit door really is a completely different ball game, so in terms of it's possible DISE assessment, we could expect something like this ....
 

- The Fire Exit Door -
 

10% Deterrence 50% Incident Monitoring

20% Site Management 20% Evidential Recording