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3TEC, our patented forced air heat technology, takes advantage of 3 technologies in one unit: Convection, Radiation and Forced air heat, benefiting from extensive R/D both with CFD and in real life tests across Sweden and Europe. At a speed of 1.5 m/s, the unique combination delivers up to 4 times higher capacity than standard convectors, delivering 1 m3 of hot air per meter per minute, meaning your bus will warm up to 4 times faster. A medium-sized city bus for up to 60 passengers equipped with the 3TEC system therefore can be heated in less than 4 minutes.