The DuraVent DuraPlus 7" Square Ceiling Support Box is a durable triple-wall chimney system component designed to provide secure structural support for wood stove chimney installations and all-fuel venting systems passing through ceilings. Built with advanced refractory blanket insulation and an air-space barrier, this ceiling support box helps maintain safe clearances while reducing heat transfer to surrounding building materials. Its square design ensures a clean, professional finish for interior chimney installations while improving overall chimney venting system efficiency and safety.

Engineered for continuous operation at flue gas temperatures up to 1000°F, the DuraVent DuraPlus ceiling support box meets strict UL 103HT standards, including one hour at 1400°F and three 2100°F chimney fire tests. This reliable chimney support system component delivers long-lasting durability, code-compliant installation, and dependable performance in residential all-fuel chimney systems.

Features

• Versatile Ceiling Installation Support: Designed for 7" DuraPlus triple-wall chimney systems, the square ceiling support box is ideal for flat, vaulted, and cathedral ceiling chimney installations in wood stove and all-fuel venting systems.
• Built-In Starter Section Design: Includes an integrated starter section, simplifying installation and ensuring a secure connection in residential chimney venting systems.
• High Load Capacity Performance: Engineered to support up to 35 feet of DuraPlus chimney pipe, providing reliable structural support for extended chimney runs.
• Clean Aesthetic Finish: The square ceiling support box is painted black, delivering a sleek and professional appearance for visible interior installations.
• Adapter Compatibility: Works with DVL and DuraBlack chimney components when using appropriate adapters for flexible system integration.
• Complete Installation Package: Includes a trim kit for finished appearance, ensuring a clean ceiling transition and proper sealing.
• Proper Sizing Guidance: Always refer to the Ceiling Pitch Table to determine the correct support box size for safe and compliant chimney installation.

Specification