An air containment cooling system for containing air between two rows of equipment racks, the air containment cooling system comprising: a canopy assembly configured to enclose a hot aisle defined by two rows of equipment racks, the canopy assembly including a cooling panel that encloses the top of the system and thus contains warm air within the hot aisle; a cooling system embedded within the canopy assembly, the cooling system being configured to cool air disposed within the hot aisle, the cooling system including a heat exchanger, a mounting plate coupled to or formed integral with the canopy assembly, and a fan module configured to move air to the heat exchanger, the fan module being releasably mounted on the mounting plate by being rotated into a locked position, the fan module including: a fan assembly having a fan and a motor; and a mounting ring configured to mount the fan assembly thereon, the mounting ring having a first interconnect (215, 218) configured to be secured to a second interconnect (224, 226) provided in the mounting plate to secure the mounting ring to the mounting plate; wherein the first interconnect comprises a mounting post and the second interconnect comprises a key slot or bayonet mount, or wherein the first interconnect comprises a key slot or bayonet mount and the second interconnect comprises a mounting post; and wherein the mounting post has been undercut or slotted to produce an engaging surface and is configured to be inserted into the key slot or the bayonet mount. a canopy assembly configured to enclose a hot aisle defined by two rows of equipment racks, the canopy assembly including a cooling panel that encloses the top of the system and thus contains warm air within the hot aisle; a cooling system embedded within the canopy assembly, the cooling system being configured to cool air disposed within the hot aisle, the cooling system including a heat exchanger, a mounting plate coupled to or formed integral with the canopy assembly, and a fan module configured to move air to the heat exchanger, the fan module being releasably mounted on the mounting plate by being rotated into a locked position, the fan module including: a fan assembly having a fan and a motor; and a mounting ring configured to mount the fan assembly thereon, the mounting ring having a first interconnect (215, 218) configured to be secured to a second interconnect (224, 226) provided in the mounting plate to secure the mounting ring to the mounting plate; wherein the first interconnect comprises a mounting post and the second interconnect comprises a key slot or bayonet mount, or wherein the first interconnect comprises a key slot or bayonet mount and the second interconnect comprises a mounting post; and wherein the mounting post has been undercut or slotted to produce an engaging surface and is configured to be inserted into the key slot or the bayonet mount. a fan assembly having a fan and a motor; and a mounting ring configured to mount the fan assembly thereon, the mounting ring having a first interconnect (215, 218) configured to be secured to a second interconnect (224, 226) provided in the mounting plate to secure the mounting ring to the mounting plate; wherein the first interconnect comprises a mounting post and the second interconnect comprises a key slot or bayonet mount, or wherein the first interconnect comprises a key slot or bayonet mount and the second interconnect comprises a mounting post; and wherein the mounting post has been undercut or slotted to produce an engaging surface and is configured to be inserted into the key slot or the bayonet mount.