Astria Firestop Thimble FST10Astria Firestop Thimble FST10 Product Details What is the function of the Astria Firestop Thimble, and how does it contribute to maintaining fire safety and proper clearance in a chimney or stovepipe installation? The Astria Firestop Thimble is used in chimney or stovepipe installations to maintain proper clearance between the stovepipe and combustible materials. Its function is to provide a fire resistant barrier that ensures a safe distance is
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