Air discharge terminal unit

An air discharge terminal unit comprising a plenum having a main air inlet, an induced air inlet, a first air outlet and a second air outlet, spaced from the first air outlet in a direction away from the induced air inlet, the induced air inlet being located unilaterally along the flow path of a main air stream which flows between the main air inlet and the air outlets, a pair of modulating control vanes located along the flow path of the main air stream on opposite sides thereof, one of said vanes being disposed between said flow path and said induced air inlet, and means for simultaneously moving said vanes toward and away from each other thereby respectively to restrict said main air inlet and expand said main air inlet and respectively to move said one vane away from and toward said induced air opening thereby respectively to expose and to mask said induced air opening.