pic of the alarm panel, it has 8 wired zones,
just a question about beams, i have around a 1-2ft section of void across majority of the roof, the cages are below, the metal roof is above, if i am using beams which are say 20cm high, am i right in thinking the beams will travel within that 20cm height, if the beams had say a 50cm height, then the beam would travel through a cage and will get triggered, i could do with some clarity on this please.