Arkham Knight HQ: Spider Drones
The destructible objects in this area are the Knight's little spider drones, found crawling along walls. The first is directly above the Batmobile winch anchor point by the fan. Blast it with the Remote Electrical Charge.
The second drone is on a wall adjacent to the balcony on the upper ledge.
The third is crawling on a sign above the fan itself.
On the opposite side of the fan chamber, just above the second set of fan blades.
High on a wall next to the first operable elevator.
Can be seen on a wall as you leave the fan chamber.
On a back wall in the Briefing Room - the first room you enter on Level 05.
In the hallway leading back to the giant fan.