[EN 12792:2003, 2223 ]:air terminal unit assembly which by virtue of the configuration of the primary air inlet(s) within the unit can induce secondary air from the surrounding atmosphere before being discharged to the treated space. The flow rate of the primary air may or may not be variable. The inlet aperture(s) for the secondary air may be fixed or adjustable by means of manual remote control. The assembly may be fitted with a heat exchanger at either the secondary air or primary air inlet(s)