Basket (0) My Account Help Guides
OPEN 7 DAYS A WEEK 0800 612 6537 Lines open today 8am - 9pm

Jargon Buster

Letter A

ABC Dry Powder

ABC Dry Powder is a fire extinguisher agent which is suitable for use on class A, class B and class C fires. It is also suitable for electrical fires.

Addressable Fire Alarm Systems

An addressable fire alarm panel communicates directly with each device. In the event of a fire, the fire panel will display the exact device (detector or call point) that signaled the alarm, allowing the fire to be located more quickly.

Adjustable Back Check

Back check is a function within the door closer that provides resistance to prevent the door leaf from being violently thrown open. Door closers with adjustable back check usually have a valve located on the front of the door closer unit which allows both the angle and the resistance of the back check to be adjusted.

Also see Back Check

Adjustable Latching Action

The latches fitted to most doors can offer some extra resistance that must be overcome by the door closer if the door is to close fully. Our range of door closers come with one of two different types of latching action - Fixed or Adjustable - which governs the speed the door closes at during the last 15° of the closing cycle.

Fixed Latching Action

The latching action is not adjustable and is largely governed by the Closing Speed of the door closer. However, if the Closing Speed is adjustable, you will have some control over the latching speed too.

Adjustable Latching Action

The speed during the last 15° of the closing cycle can be increased (e.g. to overcome a stiff latch) or reduced (e.g. to prevent the door from slamming). This is mostly independent of the Closing Speed of the door over the rest of its arc.

AFFF Foam - Aqueous Film Forming Foam

AFFF Foam is a water based fire extinguisher agent which is suitable for use on class A and class B fires.

Aico Ltd

Aico Ltd is a wholly owned subsidiary of Ei Electronics and is one of the UK's leading residential fire detection and CO detection specialist.

The Aico product range consists of:

  • Smoke and Heat Alarms
  • Fire Protection for Electrical Installations
  • Carbon Monoxide (CO) Alarms
Aico Logo

Alarm Grades by Power Type (BS 5839 Part 6)

Power Type Description BS 5839-6: 2013 Grade BS 5839-6: 2019 Grade
Battery Operated
9V alkaline battery operated smoke and heat alarms. Grade F Grade F2
Battery Operated
Sealed longlife lithium battery powered smoke and heat alarms Grade F (may be accepted as a replacement to grade D) Grade F1 and F2
Mains Powered
(Alkaline Back-up)
Mains powered smoke and heat alarms with 9v alkaline backup batteries Grade D, E and F Grade D2, F1 and F2
Mains Powered
(Lithium Back-up)
Mains powered smoke and heat alarms with sealed lithium backup batteries Grade D, E and F Grade D1, D2, F1 and F2

Alkaline Battery

Alkaline batteries use an alkaline electrolyte instead of the normal zinc chloride and acidic ammonium chloride electrolytes usually found in zinc-carbon batteries. They generally have a higher energy density and longer shelf life.

Also see Lead Acid Battery | Lithium Battery | Zinc Chloride Battery

Amigo Fire Escape Ladder

The Amigo ladder is a fire escape ladder which is designed to be permenantly installed beaneath the escape window. Its unique storage box doubles as a step during an evacuation.

ANSI - American National Standards Institute

ANSI facilitates the development of American National Standards (ANS) by accrediting the procedures of standards developing organizations (SDOs). The Institute oversees the creation, promulgation and use of thousands of norms and guidelines that directly impact businesses in nearly every sector.

ANSI is also actively engaged in accrediting programs that assess conformance to standards – including globally-recognized cross-sector programs such as the ISO 9000 (quality) and ISO 14000 (environmental) management systems.

Anti-arson Letterbox

Anti-arson letterboxes are designed stop the threat of arson attack by containing any flammable materials which may be pushed through a letterbox and then automatically extinguishing any fires that are started with the use of a heat sensitive extinguisher system.

Anti-tamper Seal

An anti-tamper seal is designed to act as a deterrent against misuse of equipment but also doubles as a visual indication that the piece of equipment has not been used.

Anti-thrust Latch

An anti-thrust latch provides additional security for final exit doors. The latch cannot be retracted using unauthorised means or by applying force and will only retract using the correct method.

Anton Group

Anton Group are a leading supplier of quality hand held instrumentation to the HVAC (heating, ventilating and air conditioning) market.

The Anton product range includes:

  • Flue Gas Analysers
  • Gas Leak Detectors
Anton ogo

Automatic and Semi-Automatic Defibrillators


Designed for use by laypersons (ideally with basic training on how to use the AED but the units will give visual and audible instructions allowing practically anyone to use them successfully), these units will issue shocks as and when needed automatically.


Designed for use by healthcare professionals who are familiar with and can understand ECG (electrocardiogram) readings, these units will detect when a shock is required and alert the user who will then make the decision on whether or not the shock should be issued. Semi-automatic units also have a pacemaker function for occasions where the victims heart rate is too slow (bradycardia).

Automatic Gain Control

Over time dust will build up on the lenses of the system which will attenuate the beam. To compensate for this the system has Automatic Gain Control (AGC). This allows the beam to operate for longer without the need for cleaning by compensating for any change in the signal strength of the beam due to dust build up. Eventually the AGC will hit a limit, and will require cleaning – as with all optical beam smoke detectors. Over time buildings will settle slightly, or expand and contract as the seasons change. AGC is also used to compensate for this where the alignment of the beam is affected as a result. Again, this would cause a change in signal for which the beam will try and compensate for.

Automatic Synchronisation

The sounders with a sweep or tonal sound will all be in synchronisation.

Auxiliary Output

This is a relay with normally open and normally closed contacts which are triggered in a fire condition.


Close close

This site uses cookies to improve your experience and for essential functioning of the site. By continuing to use our site you agree to the use of cookies.

Change your cookie settings at any time by clicking on the button at the bottom of each page. Read more about the cookies we use in our Privacy Policy.

By continuing to browse this site you agree to the use of cookies. Read our privacy policy to learn more.