OHA radiant strips are especially fitted for infrared hea-ting of industrial, commercial and sports’ buildings up to any type of height. They are on the contrary especially fitted for very high buildings which require large radiant surfaces with lower surface temperatures. OHA system does not move the dust in the air, it does not take any space on the floor and its maintenance is extremely reduced. The characteristic of the gas com- bustion group is a special combustion head in premix and afterburning at low NOx emissions and high effi- ciency. The radiant pipe circuit diameter 200/300mm assure a high thermal emission. A special insulation above the radiant strips raises further the radiant yield on the floor.