Chimney and flue are places that high temperature gas of sulfur gathers, it should use acid material. Refractory material is divided into three major parts: acid, neutral and alkaline.
The flue has fireproofing time requirements, very expensive, I just know this in my project, using a special refractory brick and fireproof plaster
middle rank。 A refractory is stronger than B refractory, low rank, the other is refractory, the senior is AB. Shale is hollow, it is not refractory, refractory, advanced, refractory B, there are nonfireproof materials in intermediate and low rank. Three types of refractory A
