![]() In every case, a burn hazard for both corneal tissue and skin is excluded. On the opposite, the results of the same evaluation carried out in the medium and far infrared spectral region at 200 degrees-400 degrees Celsius (the normal temperature range for ORTHs) do not allow to preliminary exclude a thermal risk for eye structures such as lens, near the tube surface at least. Although the ORTHs emission spectrum partially covers the near infrared region (0.8-1.4 microns) at 400 degrees Celsius and may adversely affect the retained tissue a gross evaluation of the near infrared energetic flux, weightened on the surface unit, allows to exclude this risk. Following the last one, ORTH surface temperatures resulting in a spectral emission which includes wavelengths less than 3 microns have to be considered, in the case of ORTHs with thermal power greater than 34.89 kW, as hazardous for exposed people. 1322/4134-, Direzione Generale della Protezione Civile-Ministero dell'Interno). A reason for this is represented by the existence of a specific italian regulation (Circolare N. In the present communication, the attention is driven on the characteristics of ORTH infrared emissions, with reference to potential health risks for the exposed people (especially people working within areas heated by this system). Indoor heating is obtained by an infrared emission, which is produced by the circulation of combustion exhaust gases within tubes and is collected by a set of reflecting surfaces located around the tubes. The growing number of units installed is due to several advantages, such as uniform heating, absence of air movements, energy saving, versatility and safety. warehouses, factories, garage workshops, shipyards, greenhouses, schools hall etc.). With the exception of domestic rooms, Overhead Radiant Tube Heaters (ORTH) are an effective system for indoor heating (e.g. ![]()
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