Triac AT has intelligent digital temperature control and blower speed control. Leister TRIAC AT Hot Air Tool with a 1-1/2-inch (40 mm) nozzle is an intelligent hot air tool used for TPO/PVC single-ply membrane welding, vinyl welding, overlap welding, draw welding, and stitching. The unit reaches temperatures automatically and voltage fluctuations are compensated. Adjustable heat 104 degrees to 1148 degrees air-flow control with a large digital display.