Edge datacenter nano enclosure with chimney and return air containment plenum

A modular data center has an air handling unit (AHU) that is coupled to a first panel that is engaged over a first opening in a volumetric container. The AHU directs pressurized supply air through a supply air outlet into a cold aisle causing the supply air to pass through a first side of the IT component(s) installed in an interior of the volumetric container. A chimney of a return air plenum captures return air from a second side of the IT component(s), directing the return air to a return air duct of the return air plenum that is connected to a return air inlet of the AHU. In one or more embodiments, a second AHU is coupled to a second panel that is engaged to a second opening in a second side, directing pressurized supply air via a supply air plenum to the opposing first side.