Heating device used in furnace with small heat emission, has view opening formed by glass panes, and gaps formed between glass panes to ensure flow of combustion air between glass panes

摘要

The device has a view opening formed by the glass panes (3,4,6), and gaps (18,19,20) formed between the glass panes to ensure flow of combustion air between the glass panes. The glass panes are provided with reflective coating. The gaps are formed with 10 to 15 mm distance.