Furnace Heat-up using specially designed HTPL High Velocity Gas/Oil fired burners, having capacity of 3500 Nm3/Hr..which enables a positive pressure in furnace and therefore a equal temperature distribution in to the furnace. The furnace is thus raised from ambient to 1000 Deg.C through these burners uniformly before it is charged up to with the furnace main burners. This burners are with high turndown ratio enabling temperature control to +/- 1 Deg.C.

In the reverse process a glass furnace can be cooled down to retain some of its refractory integrals of the existing furnace.