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ALF300 Fire Extinguisher (for use with anti arson letterbox)

Product code: FR MPALF300

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Maintenance Free - Automatic Fire Detector / Extinguisher - for use with MailPro Anti Arson Mailboxes



1 - 3£19.96 ex VAT

4 - 10£17.96 ex VAT

11 + Call us on 01273 475500


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ALF300 Fire Extinguisher (for use with anti arson letterbox) SKU Number - CSM07013

The ALF 300 Fire Detector & Extinguisher is a sealed for life unit which comes with a 5 year manufacturers guarantee.

(Tests have shown however that ALF extinguishers over 10 years old have still proven fully effective).

The ALF extinguisher (Automatic Linear Fire Detector/Extinguisher) consists of a sealed plastic tube filled with a special extinguishant gas stored under pressure.

Unlike conventional fire extinguishers, ALF Fire Extinguishers do not require an annual pressure test to check their performance capability, but it is recommended that they be replaced at the end of each 5 year period (or immediately after any activation). 
How does The ALF Extinguisher work?

When the ALF tube comes into contact with a flame (or in a heat source in excess of 80 degrees C), the tube ruptures, delivering the extinguishant directly to the source of the fire - which is killed instantly, before it has the opportunity to gain a foothold and spread.


Do I need Single or dual extinguishers in my Anti Arson Mailbox?

ALF extinguishers are stand alone units which operate independently and provided that the correct size extinguisher for the particular Mailbox is installed, a single extinguisher will instantly extinguish any fire that starts within the box. 

Why is a second extinguisher a good idea? - Police statistics indicate that arsonists typically remain in the area to see their fire start, and should their first attempt fail, in around 70% of cases, they will make a second arson attack attempt before police or emergency services reach the premises!


The ALF 300 Fire Detector & Extinguisher is designed for use with the small to medium size range of Mailpro Anti Arson Letterboxes / Anti Arson Mailboxes such as;

the "MailPro Slim Anti Arson Mailbox",

the "MailPro Mailguard Softbox", or

the "MailPro External Compact Letterbox".
Note: Larger Sizes are also available - check the MailPro mailbox specification to confirm extinguisher size required (if you need help to find out the size required, please call the Insight Security helpline: 01273 475500 (office hours - Mon-Fri)



Sealed for life tube filled with FE25 extinguishant gas, stored under pressure.


Dimensions & Weight:

Length:  300 mm (straight Tube)

weight:    15 grams



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Aiden Sanders @ APMS

These Tiny little tubes are absolutely magic, I’ve recently won a contract of maintaining Fire safety at a set of Safehouses for vulnerable people, Arson attacks are unfortunately part of the territory with these houses so finding ways of protecting against it is paramount, I’ve started to use these tubes inside the Letterboxes and we’ve actually had an activation, My faith in them was set in stone when I heard the fire lasted a matter of seconds before this little extinguisher dealt with the issue potentially saving lives of the occupants. Will continue to use these in future and will always recommend Insight as their service was second to none

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