VELUX blackout roller blinds designed for installation within minutes on VELUX roof windows. Manually operated, the blinds can be set to any position on the window. Blinds run in aluminium side channels ensuring smooth operation. VELUX blackout blinds provide total darkness for both night and day and each blind features an aluminium foil that reflects heat from the sun in summer whilst retaining heat in the winter. Window size code C04 / 6 - W37.3 x Drop 73cm Window size code M04 / 304 / 1 - W60.3 x Drop 73cm Window size code M06 / 306 - W60.3 x Drop 93cm Window size code M08 / 308 / 2 - W60.3cm x Drop 115cm Window size code S06 / 606 / 4 - W96.3 x Drop 93cm