Installation of Clearline fusion and Velux windows in Ashby-de-la-Zouch. Image: Virdian Solar. Viridian Solar has unveiled new roofing kits that extend its existing partnership with VELUX, announced last year. The partnership is aiming to provide a seamless combination of roof-integrated solar PV and roof windows, with the new roofing kit (F16-VBC) interfacing with the VELUX ODL Solar Integrator for a window in a position at the bottom edge of the solar array. It follows on from Viridian launching its Clearline fusion VELUX integrator (F16-VC) for this layout in March 2020, after the two companies worked together to confirm the interoperability of their systems for roof windows in a central position.