3/4" Premier Blackout Vertical Cellulars – Energy-Saving Blackout Shades for Sliding Glass Doors & Wide Windows Bring high-performance design to your patio doors and large windows with3/4" Premier Blackout Vertical Cellular Shadesfrom Select Blinds. These vertical honeycomb shades combine the insulation benefits of blackout cellulars with a vertical orientation ideal for wider window applications—giving you total light control, modern style, and year-round energy savings.