Waited a while to speak to an advisor but they were very helpful re my queries & I was happy that I was buying the right product. All credit to Velux for coding each window. The blind is excellent both in terms of quality and design and it works very well. I bought the blind to shut out the fierceness of the sun during a hot period and it completely cast the room in darkness and instantly cooled it. It glides open and shut. It was simple to fix.
