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Jargon Buster

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Fall Arrest Harness Buckles

Quick Connect:

Quick connect buckles come in two parts and one part passes through the other to create the connection.

Quick Release:

Quick release buckles work by one part of the buckle being inserted into the other to make the connection and is released by pressing both sides of the buckle simultaneously.

Fault Output

This is a relay with normally open and normally closed contacts which are triggered when a fault condition occurs.

Fire and Smoke Seal

Fire and smoke seals are fitted to either a fire door or its frame and help to prevent the passage of fire and smoke. In the event of a fire the intumescent material expands sealing the gaps around the door and maintaining the door's fire integrity.

The seals are available with 30 or 60 minutes protection and can be either surface mounted or rebated into the door or frame.

Fire Door

A fire door is a complete installed assembly, also known as a fire doorset, which is constructed of fire resisting components including doorframe, door leaf/leaves with any glazing panels required, ironmongery (locks, latches, hinges, etc), intumescent seals and an automatic closing device.

It is an internal door, whose function when closed is to resist the smoke and flames of a fire for a minimum period of time, typically 30 minutes (FD30). As such, a fire door acts to create/protect an escape route through a building or compartmentalise a fire in a section of the building, to facilitate the swift and safe evacuation of people from the premises.

Fire Door Closer Mounting Configurations

Door closers can be mounted in different ways depending upon the application for which they are being used. The three most common mounting types are detailed below:

Fig 1, also known as regular or projecting arm, is the standard fixing position for an overhead fire door closer. This is where the door closer is fitted to the opening face of the door on the hinge side, with the arms of the closer projecting outwards from the door. Fig 1 is suitable for all fire doors.

Fig 61, also known as transom, is similar to Fig 1 but where the door closer is inverted and the body of it fitted to the head of the door frame opposite the hinge side of the door. Please Note: the Certifire certificate must explicitly state approval for a door closer to be compliant in this configuration.

Fig 66, also known as parallel arm, is where the door closer is fitted to the closing face of the door opposite the hinge side of the door with the arms of the closer running parallel to the door and frame. This usually requires a different bracket for the arms, which may or may not be supplied with the door closer. Please Note: the Certifire certificate must explicitly state approval for a door closer to be compliant in this configuration.

Fig 61 and 66 allow a door closer to be fitted on external doors without the closer having to be exposed to the elements.

More Information about door closer mounting positions

Fire Door Retainer

A fire door retainer allows a fire door to be kept open legally and will ensure that the door is closed automatically in the event of a fire.

They are available as battery and mains powered versions and can either be wired into a fire alarm panel or in the case of the Dorgard, acoustically operated by the sound of the fire alarm.

Fire Escape Hoods

Fire escape hoods are designed to prevent inhalation of toxic smoke and gases in the event of a fire. They are designed to fit over the head, face or nose and mouth of a person escaping a fire and can provide up to 15 minutes protection against toxic smoke and fumes.

Fire Exit

A fire exit is the final exit on a fire escape route through a building. The fire exit door must open easily, immediately and wherever practicable in the direction of travel, i.e. outwards, into a place of safety outside the building. A fire exit must remain unobstructed at all times and bear the appropriate signage: e.g. ‘Fire Exit – Keep Clear’.

Fire Extinguisher rating

For Fire Extinguisher Rating please see Extinguisher Rating

Fire Hose Reel

Fire hose reels are permanently installed and are designed to give quick and controlled access to a water supply the event of a fire.

Fire Risk Assessment

A fire risk assessment should be carried out by a responsible person within an organisation and is designed to identify and reduce potential fire risks as well as ensure the fire safety of a premises and its occupants.


Fireco Ltd is one of the UK’s leading specialists in fire prevention and fire safety and manufacture the innovative wireless fire door retainer, the Dorgard.

Also see Dorgard | Door Closer | Deafgard

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Fireproof Hinges

Fireproof hinges are usually supplied in sets of 3 and are fire rated for either 30 or 60 minutes fire protection.

First Fix Concept

The transmitter and receiver are supplied in two parts: one is the head of the unit, and the other part is similar to a large connector called the first fix. The first fix can be easily wired in and mounted, and then the transmitter or receiver simply twists on. On the controller, the first fix allows the installer to complete the wiring before the transmitter and receiver heads are fitted.

Fixed Temperauture Heat Detector

Fixed temperature heat detectors have a single thermistor which will activate when the element reaches a set operating temperature.

Also see Heat Detector | Rate of Rise Heat Detector

Fresnel Diffuser

Fresnel diffusers take a light source and concentrate it in a specific direction making them ideal for highlighting exit routes in buildings with large open premises.

Also see Prismatic Diffusers | Opal Diffusers