I am enthusiastic about the insulation effect. The delivery took place in 2 oversized boxes (would certainly also gone differently). In the course of my kitchen renovation I have the shutter box with the same rehabilitated. Now it is November and my radiator is still not there - but thanks to the good insulating effect, the temperature is still bearable. The only drawback, the fumbling when connecting 2 Constrain parts (that is, with a width of more than 100cm) - it is supposed to be pretty tight.