How to: Install our Perfect Fit blinds in seconds 🔥 All of our perfect fit Blinds have been designed so that they can simply clip into your UPVC windows and doors, which means you don’t need to damage your window frames by screwing or drilling into them. This makes them an easy and simple option for conservatories or other UPVC windows and doors. When you open or close your window, the blind will move freely with the window itself, due to the blind being clipped between the glass and the rubber