On the front of the Arc Mini R2 is a fan grill in front with space for two(2) x 120mm fans, and two(2) 5.25” drive bays.
The left side panel has a nice factory window, which is smoked acrylic.
The back of the case has room for a 120mm fan, four(4) expansion slots with a 5th vertical, and two(2) holes for water tubes.
The front grill can be removed by pushing in and letting it pop out.
The fan grill has a foam dust filter included in it.
The front fans are mounted in slightly elongated holes, to adjust the spacing between them. This is helpful to maximize radiator support.