Jargon Buster

Letter O

One Man Test Facility

This facility allows for the service engineer to test the full system without having to go to the panel and manually reset after testing each device.

Opal Diffusers

Optical Smoke Alarm

Overhead Door Closer

A door closer is a mechanical device fitted to a door which will close the door once the user has passed through. Door closers are usually found on fire doors to ensure that they are closed in the event of a fire to reduce the risk of the fire spreading.