The Majestic ID4 4" Insulated Flex Duct – Chimney Air Kits/Flex Duct is a high-quality fireplace ventilation accessory designed to provide efficient outside air intake for wood-burning fireplace systems. Featuring a durable 4-inch (100 mm) insulated flexible duct, this fireplace air kit helps improve airflow, combustion performance, and heating efficiency while supporting safe fireplace operation. The kit includes two 42-inch (1065 mm) insulated flex duct sections, offering flexible installation options for a variety of chimney and fireplace configurations.

Engineered for reliable performance, this insulated fireplace flex duct helps reduce heat loss and maintain consistent airflow in residential fireplace installations. Ideal for use with compatible chimney air kits and wood-burning fireplaces, the Majestic ID4 flex duct enhances ventilation while supporting energy-efficient fireplace performance. A dependable solution for modern fireplace systems, it is perfect for professional installers and homeowners upgrading outdoor or indoor hearth setups.