Ideal for applications where an open flame spark risk is out of the question; the TD1250S (Slide) excels at providing 1.25 Million BTUs of clean, dry heat. The patented technology uses two diesel powered engines to agitate hydraulic oil in a flameless, sparkless, low-pressure environment. In addition, an overspeed air intake shut-off valve is standard equipment. The oil is heated and circulated, not burned, providing a clean pollution-free discharge to the target environment. Safety features are incorporated to protect the investment of your Therm Dynamics heater. All heaters are equipped with a set of four shut-off switches that terminate the engines when excessive pressures, speed or water temperatures are detected. Certified to UL733-2013 & CSA B 140.8.1967(R2015) STANDARDS REPORT NUMBER: #0489HH001S