which is horizontal and is located immediately outwardly of the collar 64 a horizontal baffle plate 68 is suspended from the shoulder 66 by a plurality of hanger brackets 70 the baffle 68 is located at approximately the same level as the ceiling 14 but is smaller than the opening 56 in order to provide an outlet 72 through which the air within hood 58 discharges into the underlying room as indicated by the directional arrow 74 in fig3 a horizontal mounting plate 76 is secured on top of the collar 64 and supports a damper housing which is generally identified by numeral 78 the damper housing 78 may be rectangular and may be equipped with one or more dampers 80 as shown in the drawings two dampers 80 may be provided although a different number of dampers may be used in each terminal unit the damper housing 78 has an open top that opens into the plenum 48 in order to receive the conditioned air that is supplied to the plenum the flow of air downwardly through the damper housing 78 into the hood 58 is controlled by the dampers 80 as best shown in fig6 each damper 80 may take the form of a flat damper blade mounted on a horizontal shaft 82 as the shafts 82 are turned the dampers 80 rotate between the fully open position shown in solid lines in fig6 and the fully closed position shown in broken lines in fig6 in the fully open position each damper 80 has a vertical orientation so that maximum flow through the damper housing 78 is provided in the closed position each damper 80 extends horizontally and the two dampers occupy.