Installation Recessed mounting in suspended ceilings. Unventilated or ventilated ceilings. VTB – for suspended ceilings with visible T-bars 15 or 24 mm. HB – recessed frame allows 600x600 to be installed in suspended ceilings with concealed T-bars and symmetrical ceiling tiles (thickness 20-22 mm). Connection Connection in separate ballast box. Snap-in terminal block 3x1,5 mm² (x2), through-wiring possible. 5x1,5 mm² (x2) when dimming. Can also be supplied with mains cable and earthed plug or chassis mounted snap-in connector. The luminaire housing and driver are connected via a Quick Connection System. Design Luminaire body of white enamelled sheet steel (RAL 9016). Louvre Delta – microprism louvre in acrylic (PMMA) with a thin opal diffuser in acrylic (PMMA) on the inside (PMMA). Light divider in acrylic (PMMA).