Tresa--best place to start----------have your maintenance manager show you using a camera (he'll know what to use) to have a look in the ductwork
Most likely, you do not need to do this------------if you want to be sure, swab the ducts in a couple places and see what (if anything) you have
Ductwork and cooling units pose very different risks----ductwork SHOULD be dry and fairly clean----just like at home, clean/replace filters
Cooling units however, they need to be on a preventative maintenance schedule-----most importantly, the drains need to be disassembled and inspected for "gunk" that will build up over time---when that happens, the water from the condensers cannot drain away, and ends up overflowing the catch pan and dripping onto things
Assuming this is newly installed ducting----i would (during zero production time) use compressed air only to blow them out---which should be more than sufficient