Majestic DuraPlus 6" Galvanized Steel Wall Thimble

The Majestic DuraPlus 6" Galvanized Steel Wall Thimble is a durable triple-wall chimney system component designed to safely pass chimney pipe through combustible walls in wood stove and all-fuel venting installations. Engineered with advanced ceramic blanket insulation and an air-space design, this insulated wall thimble keeps exterior surfaces cool while maintaining a strong internal draft for improved stove efficiency. The secure insulation eliminates hot spots and enhances overall chimney venting safety, providing reliable protection for both the structure and the chimney system in residential heating applications.

Built for continuous operation at flue gas temperatures up to 1000°F, the Majestic DuraPlus galvanized steel wall thimble meets strict UL-listed chimney standards, including one hour at 1400°F and three 2100°F chimney fire tests. This heavy-duty chimney wall pass-through system ensures long-lasting fire-safe performance and dependable installation for modern chimney venting systems.

Features

• Adjustable Wall Installation Range: Designed for 6-inch DuraPlus triple-wall chimney systems, the galvanized steel wall thimble adjusts from 4 1/4" to 7 1/4" wall thickness, fitting securely between standard wall studs for flexible chimney venting system installation.
• Expandable for Thicker Walls: Telescoping design allows extension up to 16 inches with field-fabricated extension, making it suitable for custom wood stove chimney wall pass-through applications.
• Required Horizontal Chimney Installation: Must be installed with DuraPlus chimney pipe running horizontally through the wall, extending at least 2 inches into the interior room for proper chimney safety and clearance compliance.
• Professional Interior Finish: Includes a black-painted interior trim ring for a clean, finished appearance in residential chimney installations.
• Adapter Compatibility: Works with DVL and DuraBlack adapters, providing flexible connection options for complete stove pipe and chimney venting systems.
• UL 103HT Safety Certified: Listed to UL 103HT (MH7399) standards, ensuring high-temperature fire safety and compliance for all-fuel chimney systems.

Specification