Electromagnetic Door Holder, L 4-13/16 in

all right hey guys welcome gun to firearms and such and it is time for another edition of what the heck is it and today we are going to be talking about door holders what the heck is it is probably going to be replacing my explained series because I kind of like the name better I think it's kind of stupid which I kind of like so let's dive right into what a door holder is what purpose they serve how they work how to wire them up all that jazz so let's fly over to the door holder shall we root did it do the move we're here so this is my door holder that's it right there mine like most is incredibly strong I can't get it off the mount because they are rated to be holding very very very heavy solid sometimes even metal fire doors and what happens is when a fire alarm is introduced into the system or some sort of alert what's oh my gosh what is the condition who it will the panel will tell