Astria Rigid Vertical Firestop SV4.5VFSAstria Rigid Vertical Firestop SV4. 5VFS Product Details What are the primary benefits of the Astria Rigid Vertical Firestop in a direct vent system, and how does it contribute to safety and fire prevention in installations? The Astria Rigid Vertical Firestop provides essential benefits in direct vent systems, primarily enhancing safety and fire prevention. It acts as a fire resistant barrier around vent pipes, preventing the spread of flames and heat
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