Abstract: A furnace is now provided having a dual pressure damper control system. Such system provides for substantial flexibility of control over the flow of flue gases, and consequently leads to substantial flexibility in the economical treatment of work pieces from a relatively low to relatively high product throughput. Additionally, the furnace includes a lightweight, readily repairable and readily removable, cover member. Such provides for ease of repair of not only the cover member, but also the furnace generally. Dual dampers can be used in association with dual heat chambers and burners therefore providing additional operational efficiency.

Abstract: A lightweight cover provides heat insulation for a heated vessel such as a soaking pit. The cover can be readily assembled in a manner providing for ease of repair plus simplicity of maintenance. The cover has a pair of opposing frame members with ceramic fiber insulation positioned therebetween. The insulation is secured in movable engagement such as a free-floating and swinging engagement. In this mode, compression can be exerted against the insulation to most desirably reduce heat loss otherwise caused by heat induced ceramic fiber shrinkage. Moreover, with this structure a ceramic fiber heat seal can be achieved around edges of the soaking pit.

Abstract: A lightweight cover provides heat insulation for a heated vessel such as a soaking pit. The cover can be readily assembled in a manner providing for ease of repair plus simplicity of maintenance. The cover has a pair of opposing frame members with ceramic fiber insulation positioned therebetween. The insulation is secured in movable engagement such as a draped and swinging engagement. In this mode, compression can be exerted against the insulation to most desirably reduce heat loss otherwise caused by heat induced ceramic fiber shrinkage. Moreover, with this structure a ceramic fiber heat seal can be achieved around edges of the soaking pit.