Roughly, you can determine how many SpeedComforts you need based on the width of your radiator/SpeedComfort: 40 - 70 cm: monoset 70 - 120 cm: duoset 120 - 180 cm: trioset 180 - 240 cm: trioset + 1 extension set 240 - 300 cm: trioset + 2 extension sets To calculate the ideal number of SpeedComforts for a room, fill out the calculator in a few steps. You will then receive tailored advice immediately. You can find the calculator in the SHOP.