The 12U/400mm rack is delivered as disassembled and its assemblation is a matter of a few minutes without the use of any special tools - just 2 screwdrivers.
Racks are delivered as standard with glass doors. Of course, it is possible to install with left or right opening.
There are 4 holes on the back to hang on the wall. Both the bottom and the top are ventilation openings and wiring holes. There are vent holes at the top and bottom at the sides.