The Front Panel
The Antec One has three external 5.25” bays, with meshed covers and air filters.
You can install one 120 mm fan on the front panel of the One, but there is no air filter for it.
The case comes with two USB 3.0 ports and the traditional audio jacks on the top part of the front panel. The USB 3.0 port uses an internal connector. The case comes with an adapter for you to install this internal USB 3.0 connector on a USB 2.0 header, in case your motherboard doesn’t have a USB 3.0 internal connector.