The DuraVent DuraTech 8" Black Trim Collar for Round Support Box is a premium chimney finishing accessory designed to conceal gaps between the round ceiling support box and ceiling cutout in DuraTech 8-inch chimney pipe installations. Ideal for use with wood stoves, fireplaces, furnaces, boilers, and all-fuel heating systems, this trim collar provides a clean, professional finish while enhancing the appearance of your chimney venting system. It ensures a seamless transition for modern residential chimney installations.

Engineered with Thermal Tech blanket insulation encased between dual walls, the DuraTech system delivers superior safety and performance by keeping exterior surfaces cool while maintaining high flue gas temperatures for optimal draft efficiency. Its 25% thicker inner wall enhances durability without mechanical fasteners. Tested to strict UL 103HT standards, it withstands continuous operation at 1000°F, one hour at 1400°F, and three 2100°F chimney fire tests, ensuring long-lasting reliability and safety.