At Cambridge Engineering we know that safety is not only important it’s required. Our commitment to safety and innovation are the guiding principles for everything that we manufacture and it is because of this commitment that we strive to manufacture the safest HTHV direct fired energy saving heaters available. Our HTHV heaters are “Inherently Safer” because our products use 100% outside air to heat the space. What does 100% outside air provide. VENTILATION and proper ventilation means superior Indoor Air Quality. At Cambridge we have a saying, “Buildings Don’t Need to Breathe But People Do”™.