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Length 25mm x Width 25mm x Thickness 5mm. Nickel Coated.
Approx Pull Strength 10kg.
Posted by Stephen on 13th Jul 2010
I am a building inspector and part of my job includes fire audits of existing buildings.
I use 11.5kg strength magnets to test whether a fire door is actually a fire door.
This strength of magnet is just right for testing fire doors as it allows me to undertake the task required and also allows me to get my magnet back as well.
Most fire doors have a metal frame within the structure of the door, which door components such as hinges, latches, peep holes, sequencers etc are anchored in to.
I use the magnets to determine firstly whether the door is a fire door, secondly whether it has been hung the right way and thirdly whether the door components are anchored into the door at the right place (you would be surprised how often they aren't).
Its the smallest and easiest tool in my kit.