The Veloci Fire 155 is a 155,000 BTU radiant heater and is the largest mobile radiant heater in the world. What also sets the Fire 155 apart is that its structure eliminates the refractory material cone that surrounds the conical combustion chamber, which is typical in most other competitor units. Instead, the Fire 155 155,000 BTU radiant heater features a forced air insulation pocket made of metal that lies between the combustion chamber and the external protection cone. This allows cooling air to be blown through the pocket and into the heating environment by the burner fan. The design results in a hybrid radiant and forced air heating style that overcomes the problem of fragility that often occurs with the cone structure in competitors' models.