Astria 30 Degree Hi-Temp Offset and Return 30E-12HTAstria 30 Degree Hi Temp Offset and Return 30E 12HT Product Details What is the purpose of the Astria 30 Degree Hi Temp Offset and Return, and how does it help adjust the direction and maintain proper venting in high temperature chimney systems? The Astria 30 Degree Hi Temp Offset and Return is used to adjust the direction of high temperature chimney systems while maintaining proper venting. Its purpose is to redirect the chimney pipe at a 30 degree