Galvanised rectangular VAV unit with counter rotating blades, supplied with an electronic actuator and aluminium differen- tial pressure sensor. This VAV unit can be applied for regulating constant or variable air volumes based on air quality and/or temperature. The aluminium blades are equipped with an airtight seal and mainte- nance free bearings. Housing meets Class C following EN 12237, blades meet Class 2 following EN 1751. Available without (BSS) and with (BSD) insulation, and external sound attenuators.