My brother and I are installing a DVR-based security system into his pizzeria. We've got two 60' runs that need to be made out to the two outside cameras to cover dumpsters and rear parking area. We will be running the coax and power cables up into a drop ceiling, then 12' over the ceiling, then out and up to the roof. We do have a/c ducts in the drop ceiling but they're enclosed. The reason I mention this is because I'm not sure if the space above the drop ceiling is considered a plenum. Is it, and if so would we need to run plenum-rated coax -and- power cord? ? Thank you.
-- John