DuraVent DuraChimney II 12" Firestop The DuraVent DuraChimney II 12" Firestop is a premium factory-built chimney system component designed to provide essential fire safety protection where the chimney passes through floors or ceilings. Ideal for wood-burning fireplaces, stoves, and solid-fuel venting systems, this firestop is part of the trusted DuraChimney II double-wall chimney system, offering a lightweight, unitized design that eliminates field assembly for faster and more efficient installation in residential and commercial applications. Engineered for safety and performance, the DuraChimney II firestop maintains required clearance and helps prevent heat transfer to surrounding building materials. Its double-wall, air-cooled design ensures the chimney stays cooler on the outside while maintaining a strong internal draft for optimal venting efficiency. The system accommodates thermal expansion under high temperatures for long-term durability. UL 103 listed, it is tested for continuous operation at 1000°F, one hour at 1400°F, and ten minutes at 1700°F, delivering dependable, code-compliant chimney fire protection and safety. Features DuraVent DuraChimney II 12" Firestop – Essential Chimney Safety Component: Designed for the DuraChimney II factory-built double-wall chimney system, ideal for wood-burning fireplaces, stoves, and solid-fuel venting installations. Critical Ceiling and Floor Penetration Protection: Used in ceiling and floor penetrations above the fireplace, providing essential fire safety where the chimney passes through building structures. Underside Ceiling Installation Design: Engineered to fit securely on the underside of the ceiling, ensuring proper alignment and compliance with chimney system installation requirements. Supports UL-Listed Chimney System Safety: Helps maintain safe clearances and supports compliance with UL 103 listed chimney system standards for residential and commercial installations. Roof Penetration Not Required: A firestop is not required when passing through the roof, simplifying installation planning for multi-level chimney runs. Improves Fire Safety & Structural Protection: Helps prevent heat transfer to surrounding framing materials, enhancing overall chimney fire safety and building protection. Specifications Specification Details Item Number 12DCA-FS Series DuraChimney II (8" - 16") Product Type Firestop Diameter 12" A 21 5⁄8" B 15 3⁄8" Downloads Product Catalog Installation Product Typical Installation
