Forte HT high temperature circulators are designed for applications that require very high temperatures, as high as +400 °C. Thanks to their closed-loop design, they emit no oil odor, even at high temperatures. These units have automated heat-up, filling, and degassing features. , Forte HT high temperature circulators are designed for applications that require very high temperatures, as high as +400 °C. Thanks to their closed-loop design, they emit no oil odor, even at high temperatures. These units have automated heat-up, filling, and degassing features.